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The Application of Inorganic Fertilisers to Conditioned Pinus radiata Prior to Lifting as a Means of Improving Root Growth Capacity
Item type: Journal Article • Journal: South African Forestry Journal • Authors: D. G.M. Donald --- ,A modified root growth capacity technique was used to evaluate the effect of the application of different types and quantities of fertilisers on the root growth capacity (RGC) of conditioned Pinus radiata seedlings. The experiment indicates that 0,05 g N... -
Role of Eucalypt Plantations in Timber Supply and Forest Conservation in Sub-Saharan Africa
Item type: Journal Article • Journal: South African Forestry Journal • Authors: A. P.G. Schönau --- Institute for Commercial Forestry Research, South AfricaThe role of eucalypt plantations in timber supply and forest conservation in Sub-Saharan Africa was investigated. The annual destruction of 11,5 million ha of tropical forest is highlighted, the various causes indicated and the controversy whether fast-growing plantations and woodlots... -
Effect of Initial Spacing and Thinning on Some Wood Properties of Eucalyptus grandis
Item type: Journal Article • Journal: South African Forestry Journal • Authors: F.S. Malan --- Division of Forest Science and Technology, M. Hoon --- Division of Forest Science and Technology,A study was made of the effect of thinning intensity on wood density and some wood anatomical properties and their within-tree variation patterns, as well as the extent to which the development of growth-stress splits in logs and sawn boards... -
Root-shoot Growth Periodicity in Ocotea bullata
Item type: Journal Article • Journal: South African Forestry Journal • Authors: H. Kotze --- Division of Forest Science and Technology, Saasveld Forestry Research Centre, South Africa C.J. GeldenhuysPeriodicity in leaf fall, and in the growth of roots and shoots of Ocotea bullata was studied. Leaf fall of canopy trees was measured to establish the natural phenological pattern of mature trees. Shoot growth was measured on potted plants... -
The Wood Properties and Qualities of Three South African-Grown Eucalypt Hybrids
Item type: Journal Article • Journal: South African Forestry Journal • Authors: F.S. Malan --- Division of Forest Science and Technology,Hybridisation is becoming an increasingly important technique in tree breeding to improve yields, adaptability and wood quality. In this study, sample material from crosses of Eucalyptus grandis with E. tereticornis, E. camaldulensis and E. urophylla established on sites of which... -
Regeneration Procedures of Pinus radiata in the Southern Cape Province
Item type: Journal Article • Journal: South African Forestry Journal • Authors: J.B. Zwolinski --- , D. G.M. Donald --- Forestry Faculty, A. van Laar --- Forestry Faculty, W.H. Groenewald --- Division of Forest Science and Technology,The present paper is a continuation of the series dealing with the regeneration of Pinus radiata in the southern Cape Province. The study deals with post planting mortality and growth in response to the experimental treatments and planting site environment... -
Modelling Diameter and Height Distributions through Dispersion Statistics in Even-aged Pine Plantations
Item type: Journal Article • Journal: South African Forestry Journal • Authors: HorstW. Kassier --- , South Africa BrianV. Bredenkamp --- Department of Forest Science, South AfricaDiameter and height distribution recovery, in combination with standlevel projection modelling, is generally used in Southern Africa for predicting growth and yield in even-aged pine plantations. A different approach for modelling diameter and height distributions for five pine species commercially... -
Field Performance of Micropropagated and Macropropagated Eucalyptus Hybrids
Item type: Journal Article • Journal: South African Forestry Journal • Authors: M.P. Watt --- Department of Biology, South Africa E.A. Duncan --- Department of Biology, South Africa M. Ing --- Department of Biology, South Africa F.C. Blakeway --- Department of Biology, South Africa B. Herman --- Department of Biology, South AfricaPlantlets derived, via both in vitro micropropagation and from rooted cuttings, from seven different Eucalyptus hybrid genotypes were assessed for their field performance in Kwambonambi, KwaZulu Natal. Tree survival, height, mean annual increment, diameter at breast height and size uniformity... -
The Blackwood Group System: its relevance for sustainable forest management in the southern Cape
Item type: Journal Article • Journal: South African Forestry Journal • Authors: CoertJ. Geldenhuys --- Division of Water, Environment and Forestry Technology, Southern AfricaThe invasion status of Australian blackwood, Acacia melanoxylon, is assessed against its value as a commercial tree in the southern Cape forests. The species was introduced from Australian rain forests and planted extensively in the southern Cape forests since 1909... -
Effect of Anti-Fungal Agents on In Vitro Cultures of Eucalyptus grandis
Item type: Journal Article • Journal: South African Forestry Journal • Authors: M.P. Watt --- Department of Biology, South Africa B.A. Gauntlett --- Department of Biology, South Africa F.C. Blakeway --- Department of Biology, South AfricaYoung, small shoot explants of E. grandis were multiplied in the presence of 0,5 and 1 g/ℓ benomyl, 0,25 and 0,5 g/ℓ chlorothalonil, 0,36 and 0,72 g/ℓ propamocarb hydrochloride and 0,002 5 g/ℓ Amphotericin B. The multiplied shoots were then... -
The performance of tropical pastures in the drier phase of the Highland sourveld of Natal
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: G.M. Brockett --- Department of Agriculture (Natal Region), N.N. Gray --- Department of Agriculture (Natal Region),Several tropical grasses (Acroceras macrum, Cenchrus ciliaris, Cyndon sp., Digitaria sp. and Pennisetum clandestinum) and legumes (Desmodium uncinatum and Lotononis bainesii) were evaluated at the Kokstad Research Station (Bioclimatic sub‐region 4f of Natal) over a period of seven years. The... -
Produksie en kwaliteit van ‘n aantal grasspesies in die Combretum‐veld van noord‐transvaal
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: P.A. Pieterse --- Departement Plantproduksie, Fakulteit Landbouwetenskappe, J.O. Grunow --- Departement Plantproduksie, Fakulteit Landbouwetenskappe,Die produksie en kwaliteit van vyf spesies (Themeda triandra, Heteropogon contortus, Digitaria eriantha var. pentzii, Schmidtia pappophoroides en Eragrostis rigidior) is by verskillende frekwensies van ontblaring op ontbosde en onontbosde bosveld gemeet. In die daaropvolgende jaar is intensiteit bygebring met... -
Die wiskundige simulering van koolhidraattranslokasie in natuurlike grasveld1
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: H J Fouché --- Departement van Landbou en Watervoorsiening (Vrystaatstreek), JM De Jager --- Departement Landbouweerkunde, J Booysen --- Departement van Landbou en Watervoorsiening (Karoostreek),Die groeifunksies benodig vir die simulasie van produksie van ‘n Themeda triandra‐grasveld met behulp van die PUTU 11 simulasiemodel is ontwikkel. Vir die ontwikkeling van die model is die veldproduksiedata van die 1980/81 groeiseisoen gebruik waarna dit suksesvol, vir drie... -
Yield and morphological responses of a forage sorghum to mefluidide
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: D I Bransby --- , A G Matches --- , USA C R Richardson --- , USADue to rapid growth, stem build‐up in forage sorghum crops often leads to considerable wastage by animals and consequent loss of production. In this study the potential of the chemical plant growth regulator, mefluidide, for modifying the morphology of forage... -
Die invloed van die beskikbaarheid van nutriënte en ontblaringsbestuur op die produksie van digitar1a Eriantha variëteit Eriantha
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: P A Pieterse --- Departement Plantproduksie,Die invloed van verskillende peile van stikstof (N), fosfaat (P) en kalium (K) op die produksie en kwaliteit van Digitaria eriantha var. eriantha is in sandkultuur ondersoek. Verder is daar ook gekyk na die invloed van drie intensiteite van ontblaring... -
Growth analysis of themeda triandra and sporobolus fimbriatus tillers in semi‐arid grassveld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.E. Danckwerts --- Department of Agriculture (Eastern Cape Region),Marked populations of Themeda triandra and Sporobolus fimbriatus tillers were sequentially harvested at fortnightly intervals both under irrigation and under unamended moisture conditions. Sampling covered a period from tiller initiation through to senescence after flowering. -
The influence of tiller age and time of year on the growth of Themeda tri andra and Sporobolus fimbriatus in semi‐arid grassveld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.E. Danckwerts --- Department of Agriculture (Eastern Cape Region),Sequential growth measurements were made on successive populations of Themeda triandra and Sporobolus fimbriatus tillers initiated at different times of the year. The independent influences of tiller age and time of year on tiller growth were isolated by deriving growth... -
Growth patterns and annual growth cycle of Acacia karroo Hayne in relation to water stress I. Leaf and shoot growth
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: W.R. Teague --- , B.H. Walker --- Botany Department,A field study was conducted to describe the growth patterns of A. karroo at different levels of water stress in different edaphic situations. -
The response of Acacia karroo plants to defoliation by hand compared to defoliation by goats
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: W.R. Teague --- ,The leaf and shoot growth of Acacia karroo plants defoliated by goats was compared to that of plants in which leaf only or leaf plus shoot‐tips were removed by hand, to simulate goat browsing. -
Voorlopige evaluasie van sporobolus fimbriatus as aangeplante weiding in die sentrale oranje‐vrystaat
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: L.G. du Pisani --- , I.W. Knight --- ,Die potensiaal van Sporobolus fimbriatus as aangeplante weiding is ten opsigte van relatiewe groeitempo, kumulatiewe groei, droëmateriaalproduksie, weikapasiteit, blaar : stingel verhouding en kwaliteit (ruproteïen en verteerbaarheid) geëvalueer. -
Desmodium: A low‐cost pasture for the eastern cape coastal region
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: G.R. Barnes --- Department of Agriculture (East Cape Region),Desmodium intortum is well suited to the East London Coastal area for beef production under dryland conditions. Although slow to establish, satisfactory livestock production is maintained under a low fertilizer regime. Experimental results indicate stocking rates for maximum production per... -
A comparison of a number of annual cool season legumes under dryland conditions in the Dohne Sourveld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: C.J.G. Le Roux --- Department of Agriculture and Water Supply (Eastern Cape Region), L.G. Howe --- Department of Agriculture and Water Supply (Eastern Cape Region),Fifteen annual cool season legumes were compared under dryland conditions on two sites in the Dohne Sourveld. These sites were Dohne, with a mild but dry winter and an average rainfall of 743 mm per year, and Grasslands, a colder,... -
Effect of intensity of defoliation by goats at different phenophases on leaf and shoot growth of acacia karroo hayne
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: W.R. Teague --- , B.H. Walker --- Botany Department,Defoliation by goats (leaves plus shoots) during the growing phenophases resulted in a considerable stimulation of leaf and shoot growth relative to non‐defoliated plants. The response differed considerably depending on the intensity and phenophase of defoliation. Plants were most susceptible... -
The influence of level and distribution of nitrogenous fertilizer on the dry matter production of Eragrostis curvula
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: N.F.G. Rethman --- Department of Agriculture and Water Supply, Republic of South Africa L.G. vanZy1 --- Department of Agriculture and Water Supply, Republic of South Africa B.H. Beukes --- Department of Agriculture and Water Supply, Republic of South Africa212 kg N/ha was the most profitable level. With the probability of poor seasons (when 106–159 kg N/ha was more profitable), the optimum level of spring fertilization being in the region of 100 kg N and the improved distribution of... -
Effect of intensity and frequency of defoliation on aerial growth and carbohydrate reserve levels in Acacia karroo plants
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: W.R. Teague --- Department of Agriculture and Water Supply (Eastern Cape Region), Republic of South AfricaAcacia karroo trees were defoliated by goats at two intensities and four frequencies; 2, 4, 8 and 12‐weekly. Leaf accumulation and carbohydrate reserve levels were compared to a non‐defoliated control, and to plants (defoliation controls) which were defoliated for the... -
Influence of phosphatic fertilization on the yield and chemical composition of grass pasture
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: N.F.G. Rethman --- Department of Agriculture & Water Supply, Republic of South Africa B.H. Beukes --- Department of Agriculture & Water Supply, Republic of South AfricaWhile the distribution of P fertilizer had an insignificant influence on the DM production of a grass pasture over a three‐year period, the level of both N and P was highly significant. Growth patterns were unaffected by any of the... -
The response of Acacia karroo plants to defoliation of the upper or lower canopy
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: W.R. Teague --- , Republic of South AfricaThe response of Acacia karroo trees to defoliation of either the upper or lower canopy only, was compared experimentally with that of plants whose whole canopies had been defoliated at a range of defoliation levels. These plants were very sensitive... -
Partitioning, storage and remobilization of 14C assimilated by Themeda triandra Forssk1
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.E. Danckwerts --- Department of Agriculture and Water Supply (Eastern Cape Region), Republic of South Africa A.J. Gordon --- , United KingdomThe second youngest fully‐expanded leaf on the main tiller of vegetative Themeda triandra plants was exposed to 14CO2. Thereafter, quantitative analysis of partitioning, storage and remobilization after defoliation of 14C‐labclled assimilate was conducted in serially‐harvested plants over a 27‐day period... -
Kouebeskadiging van houtagtige plante in die Suuragtige‐Gemengde Bosveld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: G.N. Smit --- DepartementLandbou‐ontwikkeling (Transvaalstreek), Republiek van Suid‐AfrikaCold damage to woody plants in the Sourish Mixed Bushveld. An incident of damage to woody plants by cold in the Sourish Mixed Bushveld was investigated. Woody plants in eight paddocks which were subjected to long‐term grazing treatments and which... -
‘n Tegniek om beskikbare bogrondse fitomassa van graspolle in ontblaring‐studies te kwantifiseer*
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.J. Jordaan --- Departement Landbou‐ontwikkeling (Transvaalstreek), Republiek van Suid‐Afrika N.F.G. Rethman --- Departement Plantproduksie, Republiek van Suid‐Afrika P.A. Pieterse --- Departement Plantproduksie, Republiek van Suid‐AfrikaA technique to quantify available above‐ground phytomass of grass tufts in defoliation studies is described. Highly significant correlations were found between tuft volume and above‐ground phytomass in eighteen out of twenty‐two species that were examined. Tuft volume can therefore be... -
Soil factors affecting tree growth and root development in a citrus orchard
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.J. Nel --- , A. T.P. Bennie --- ,Tree- and root-growth parameters correlated well with a number of soil properties Useful relationships were established between unconfined penetrometer resistance, air capacity (at FWC), tree growth and root development. -
Causes, adverse effects and control of soil compaction
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. T.P. Bennie --- Department of Soil Science, G.N. Krynauw --- Department of Agriculture,The causes, adverse effects and control of soil compaction, with special reference to Southern African conditions, are reviewed. The main causes for soil compaction are the well-rounded and -sorted fine sand fraction of the aeolian sandy soils combined with compression... -
Cyclic patterns of growth and rubber deposition in guayule Parthenium argentatum. Suggestions for a management programme
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.G. Gilliland --- , J. van Staden --- ,As the natural pattern of development and rubber synthesis in guayule (Parthenium argentatum) is cyclic any treatments to improve growth and rubber production should be synchronized with the normal sequence of events pertaining to growth and metabolism. Starting with 25-week-old... -
Enkele faktore wat die vruggroei van sitrus beïnvloed
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S.F. du Plessis --- , Republiek van Suid-Afrika H.M. du Plessis --- , Republiek van Suid-Afrika'n Ondersoek het aangetoon dat 'n hoogsbetekenisvolle (r = 0,96) verwantskap bestaan tussen waterverbruik van 'n volwasse sitrusboom en vruggroeitempo. Waterverbruik bereik 'n maksimum van 80–90 l/dag gedurende die periode Desember tot einde Maart, dit is dieselfde tyd wanneer vruggrootte... -
Initial seedling growth rates in a semi-dwarf spring wheat collection
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.F. Marais --- Department of Genetics, Republic of South Africa P.S. Botma --- Department of Agriculture and Water Supply, Republic of South AfricaA relationship was observed between seedling growth rate and seedling emergence under conditions of soil capping. Coleoptile and root growth rates were strongly influenced by the origin of the seed sample and the genotype involved, whereas genotype × environment interactions... -
Die invloed van plantdatum op die groei en ontwikkeling van grondbone (Arachis hypogaea L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.J. van Rooyen --- Direktoraat Bio- en Datametriese Dienste, Republiek van Suid-Afrika C.J. Swanevelder --- , Republiek van Suid-AfrikaGrondbone wat vir drie seisoene op drie plantdatums, nl. die laaste week van Oktober, middel November en die eerste week van Desember geplant is, het laer opbrengste gelewer namate later geplant is. Groei-analisedata is weekliks geneem op blare, stamme, peule... -
Soil aggregate stability: The contribution of biological and physical processes
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.B. Molope --- Crop production, Agriculture Department, Private Bag X2039,The roles of fungal growth, soil organic matter and particle re-orientation in soil aggregate stabilization during ageing of two British soils with different cropping histories were studied. Soils were subjected to simulated cultivation, and the subsequent changes in aggregate stability... -
Risk analysis of wheat production in the central Orange Free State using a growth model
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Singels --- Department of Agrometeorology, Republic of South Africa J.M. de Jager --- Department of Agrometeorology, Republic of South AfricaA wheat crop growth model (Singels, 1983) was refined and used to calculate annual grain yield from weather data for 45 seasons in the Bloemfontein area. Five different levels of profile-available water capacity were used as soil input parameter. Other... -
Effect of water stress on cane growth and water use of sugar cane
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.G. Inman-Bamber --- , Republic of South Africa J.M. de Jager --- , Republic of South AfricaThe growth and water use of three sugar cane cultivars, NCo376, N12 and N14, were measured under varying degrees of water stress controlled by means of a movable rain shelter. Plots of a first ratoon cane crop were allowed to... -
The inheritance of base temperature in grain sorghum
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W.G. Wenzel --- , Republic of South AfricaTwo different methods were used to identify the genetic determinants of the base temperatures of sorghum seeds which were germinated at 15°C. These were a factorial mating design and a crossing system to identify lines which contain the greatest number... -
Reaction of three veld grasses to different schedules of grazing and resting. 1. Patterns of shoot growth
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.L. Barnes --- Department of Agriculture and Water Supply, Republic of South AfricaSeven defoliation treatments involving grazing at three-weekly intervals with sheep until mid-January or mid- March, or for the whole growing season, at each of two stocking rates, or resting for the whole growing season, were applied on veld during the... -
Abnormalities of the growth point and ear of barley caused by 2,4-dichlorophenoxy acetic acid
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.W. Loubser --- Department of Agriculture and Water Supply, Republic of South Africa A. L.P. Cairns --- , Republic of South AfricaTreatment of barley plants with 2,4-D, when the main tiller apical meristem was in the late vegetative or double ridge stage, resulted in the production of various abnormalities including missing spikes, branched spikes, whorls of spikelets and paired spikelets instead... -
Growth and nutrient content of soybeans in relation to solution calcium and aluminium
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.D. Noble --- Department of Crop Science, Republic of South Africa M.E. Sumner --- Department of Agronomy, United States of AmericaAluminium (Al) is a major component of most soils and is a limiting factor to sustained crop production in many regions. The amelioration of Al toxicity is of theoretical as well as practical interest in our understanding of mechanisms of... -
Die invloed van bemestingplasing op wortelontwikkeling van mielies
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. du Toit --- , Republiek van Suid-AfrikaVier behandelings waar bemesting op verskillende dieptes geplaas is, asook 'n geen-bemestingspeil as kontrole, is onder 'n stoppelbewerkingstelsel geëvalueer. Wortelontwikkeling is op drie stadiums gedurende die groeiseisoene ondersoek. Diep plasing van bemesting stimuleer afwaartse wortelontwikkeling, veral gedurende die vroeë vegetatiewe... -
Bepaling van donkerrespirasie by mielies (Zea mays L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W.H. du Preez --- Landboufakulteit, Republiek van Suid-Afrika J.J. Human --- Landboufakulteit, Republiek van Suid-Afrika L.P. de Bruyn --- Landboufakulteit, Republiek van Suid-AfrikaTwee mieliecultivars wat in potte onder glashuistoestande met optimale watervoorsiening gekweek is, is gedurende die agtblaarstadium en stuifmeelstort tot baardverskyning aan stremming onderwerp deur watertoediening te weerhou. Die CO2-uitvloeitempo is op sekere tye gedurende die nagperiode gemonitor. Hierdie waardes het... -
Effect of temperature during the first 42 days following full bloom on apple fruit growth and size at harvest
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O. Bergh --- , Republic of South AfricaThe relationship between temperature prevailing during the 42-day period following full bloom (42 DFFB) and fruit size at harvest of four apple cultivars was studied for two seasons. Lower temperatures during the first season resulted in smaller fruit whereas higher... -
Controlling excessive growth in cotton by multiple applications of low concentrations of mepiquat chloride
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.C. Dippenaar --- , Republic of South Africa C.R. Nolte --- , Republic of South Africa C. Barnard --- , Republic of South AfricaExcessive vegetative growth of cotton occurs under favourable growing conditions and this contributes to yield losses. Low concentrations of mepiquat chloride (1, 1-dimethylpiperidinium chloride) were applied to vigorous, growing cotton by means of two or more sprays at different time... -
The effect of leaf water potential on the carbon-dioxide uptake rate during different growth stages of wheat (Triticum aestivum L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.J. Human --- Department of Agronomy, Faculty of Agriculture, Republic of South Africa W.J. Roux --- Department of Agronomy, Faculty of Agriculture, Republic of South Africa L.P. de Bruyn --- Department of Agronomy, Faculty of Agriculture, Republic of South AfricaThe effect of water stress on the CO2 uptake rate was measured at three different growth stages of wheat grown in Mitscherlich pots in a glasshouse experiment. Stress was induced by withholding water until the leaf water potential reached −2... -
A comparison of the herbage and seed yields of annual cool season pasture legumes in the Bathurst, Alexandria and Humansdorp areas
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C. J.G. le Roux --- Department of Agricultural Development, Republic of South Africa T. Daines --- Department of Agricultural Development, Republic of South Africa R.A. Ingpen --- Department of Agricultural Development, Republic of South Africa E. Oosthuysen --- Department of Agricultural Development, Republic of South Africa J.S. Swart --- Department of Agricultural Development, Republic of South AfricaThe herbage and seed yields of annual cool season pasture legumes at three coastal sites in the eastern Cape are compared. Fair yields were obtained at the high rainfall sites, but at the low rainfall site the crops were unreliable... -
Refinement and validation of the PUTU wheat crop growth model 1. Phenology
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Singels --- Department of Agrometeorology, Republic of South Africa J.M. de Jager --- Department of Agrometeorology, Republic of South AfricaThe phonological submodel of the PUTU wheat crop growth model was refined to account for the variation in sensitivity to vernalization and photoperiod. Crop development rate was simulated in five phenological phases making use of temperature and photoperiod. Base values... -
Refinement and validation of the PUTU wheat crop growth model 2. Leaf area expansion
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Singels --- Department of Agrometeorology, Republic of South Africa J.M. de Jager --- Department of Agrometeorology, Republic of South AfricaA refined leaf growth submodel was incorporated in an existing wheat crop growth model. The submodel calculated daily green leaf area expansion per plant by taking into account plant population, crop age, interplant competition, temperature and crop water status. After... -
Refinement and validation of the PUTU wheat crop growth model 3. Grain growth
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Singels --- Department of Agrometeorology, Republic of South Africa J.M. de Jager --- Department of Agrometeorology, Republic of South AfricaA submodel for simulating daily grain growth was incorporated in an existing wheat crop growth model. The submodel calculated daily potential grain growth from green leaf area index, plant population and crop stage. Simulated daily potential grain growth was reduced... -
A growth model for sugar-cane based on a simple carbon balance and the CERES-Maize water balance
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.G. Inman-Bamber --- , Republic of South AfricaThe economic optimum harvest age for sugar-cane depends to a large extent on how rates of photosynthesis and respiration change with age. A simple model of the carbon balance in which a constant photosynthetic efficiency was assumed, accounted to a... -
Evaluating different wheat production strategies for the Orange Free State using stochastic dominance techniques and a crop growth model
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Singels --- Department of Agrometeorology, Republic of South Africa J.M. de Jager --- Department of Agrometeorology, Republic of South AfricaA wheat crop growth model and stochastic dominance techniques were used to evaluate several wheat production strategies for the Orange Free State. Fifty seasonal grain yields and corresponding gross margins were calculated from daily weather data and soil data for... -
The potential effect of environmental conditions on the growth of irrigated cool season pastures in the Dohne Sourveld
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: c. J.G le Roux --- Dohne Agricultural Centre, Republic of South Africa L.G. Howe --- Dohne Agricultural Centre, Republic of South Africa L.P. du Toit --- Dohne Agricultural Centre, Republic of South Africa W. Iveson --- Dohne Agricultural Centre, Republic of South AfricaFour temperate grasses (Festuca arundinaceae, Festuca X Lolium hybrid, Lolium boucheanum and Lolium multiflorum) were grown under irrigation at the Dohne Agricultural Centre. The object was to determine the monthly growth and nutritional value of the grasses. The effects of... -
Effect of different day and night temperatures on the diurnal growth rate of terminal and lateral fruits in Golden Delicious apple
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O. Bergh --- , Republic of South Africa DeV. Cloete --- , Republic of South AfricaThe diurnal growth rate of terminal and lateral fruitlets in the same cluster was studied in Golden Delicious under varying night and day temperature conditions In growth chambers as well as in the open. Terminal and lateral fruitlets had a... -
Prosedures en probleme by die gebruik van die PUTU9–87 gewasgroeisimulasiemodel vir koring onder besproeiing in die Vanderkloof-Staatswaterskema
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. H.F. Botes --- Departement Landbou-ekonomie, Republiek van Suid-Afrika L.K. Oosthuizen --- Departement Landbou-ekonomie, Republiek van Suid-AfrikaDie doel van hierdie ondersoek was om die PUTU9–87 gewasgroeisimulasiemodelte kalibreer om koringop-brengste en die grondwaterinhoud op 'n bevredlgende wyse in die Vanderkloof-Staatswaterskema te voor- spel, gegewe beperkte eksperimentele data. Opbrengste wat met PUTU voorspel is, word vergelyk met eksperimentele... -
Influence of temperature during the preceding growth period of lucerne on its regrowth at different temperatures
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.L. Greenfield --- Department of Agronomy, United States of America Dale Smith --- Department of Agronomy, United States of AmericaOne-year-old lucerne (Medicago sativa L. cv. ‘Vernal’) plants were grown to first flower through three cuttings in three temperature regimes, H (33°C day/24°C night), W (27718°C) and C (21712°C), to ascertain the influence of temperature preceding defoliation on subsequent growth... -
Fertilizer placement of maize: I. Grain yield and plant growth
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. du Toit --- , Republic of South Africa J.J. Human --- , Republic of South AfricaNormal fertilizer placement, two deeper than normal, broadcast and no fertilizer treatments were compared in a stubble tillage system in the north-western Free State. Plant growth, as indicated by leaf area, leaf dry mass and stem dry mass, was evaluated... -
Kompetisie tussen koring (Triticum aestivum L.) en Bromus diandrus I. Invloed op vegetatiewe groei
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.M. Ferreira --- Departement Landbou-ontwikkeling, Republiek van Suid-Afrlka G.A. Agenbag --- Departement Akkerbou en Weiding, Republiek van Suid-AfrikaDie doel van hierdie studie was om die kompetisievermoë van koring (Triticum aestivum L.) en Bromus diandrus Roth, te vergelyk in terme van vegetatiewe groei in veldproewe. Die proewe is ontwerp as 'n verpla- singsmodel met sewe populaslesamestellings (behandelings) en... -
The inheritance of seedling growth rate in grain sorghum
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W.G. Wenzel --- , Republic of South AfricaThe inheritance of growth rate in grain sorghum seedlings was studied in two factorial crossing systems. The presence of both additive and dominance genetic variation was indicated. The additive gene effects played a greater role. At least three genetic factors... -
Die fitotoksiese eienskappe van koring-strooi en die invloed daarvan op opkoms, vegetatiewe groei en opbrengs van koring (Triticum aestivum)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.C. Raath --- , Republiek van Suid-Afrika P. C.J. Maree --- Departement Akkerbou en Weiding, Republiek van Suld-AfrikaDie vrystelling van allelopatiese stowwe as ontbindingspro- dukte van koringstrooi kan swak plantegroei en opbrengs van koring veroorsaak. 'n Glashuisstudie is oor drie jaar uitgevoer om die opkoms, vegetatiewe groei en opbrengs van koring (kultivar SST66 en Palmiet) te ondersoek... -
Die gebruik van groeireguleerders om die blomperiode van katoen te wysig
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.C. Dippenaar --- , Republic of South Africa T.J. Meyer --- , Republic of South AfricaKatoengebiede in Suid-Afrika, hoër as 950 m bo seevlak, het 'n kort groeiseisoen indien laat in November geplant word. Die bydrae van groeireguleerders en verbouings praktyke om rypwording van laat geplante katoen te verhaas en die uitwerking daarvan op veselgehalte,... -
Manipulasie van sori-voorkoms op Rumohra adiantiformis blare
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: ElsaS. van Wyk --- Departement Plantproduksie, Republiek van Suid-Afrika A.B. Wessels --- Departement Plantproduksie, Republiek van Suid-Afrika R. Owen --- Sentrum vir Navorsingondersteuning en Rekenaarkundigheid, Republiek van Suid-AfrikaRumohra adiantiformis (G. Forst.) Ching, die Seweweeks- of Knysnavaring se gewildheid as snyloofproduk neem vinnig toe. Onder natuurlike groeitoestande ontwikkel die Knysnavaring slegs beperkte hoeveelhede sori, terwyl groot hoeveel- hede sori ontwikkel wanneer die varing onder skadunet verbou word. Die... -
Reaksie van twee lentekoringkultivars op stikstof- en swaelbemesting in die Swartland. I. Vegetatiewe groei, opname en konsentrasie van stikstof en swael in die vegetatiewe plant
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.P. du Plessis --- , Republiek van Suid-Afrika G.A. Agenbag --- Departement Akkerbou en Weidlng, Republiek van Suid-AfrikaDie belangrikheid van die korrekte N: S verhouding het die vraag laat ontstaan of 'n wanbelans tussen N en S nie gedeeltelik 'n bydrae tot die swak benuttingsdoeltreffendheid van N by hoë N-bemestings in die Swartland kan lewer nie. 'n... -
Development of a chemical control strategy for Chilo partellus (Lepidoptera: Pyralidae) in grain sorghum
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. van den Berg --- Summer Grain Centre, Republic of South Africa M.C. van der Westhuizen --- Department of Zoology and Entomology, Republic of South AfricaFour field trials were conducted over three seasons to determine the optimum plant growth stages for single and follow-up insecticide applications for the control of Chilo partellus in grain sorghum. The insecticide was applied at various vegetative and reproductive plant... -
Fertilizer placement of maize. II. Root growth and water use
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. du Toit --- , Republic of South Africa J.J. Human --- , Republic of South AfricaNormal fertilizer placement, two placements deeper than normal, a broadcast application and a non-fertilized control were compared to maximize production in a stubble tillage system. Root growth was evaluated at three growth stages from tassel initiation to flowering during the... -
The response of lucerne and red clover roots to aluminium/hematoxylin: how universal is the hematoxylin test for aluminium?
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.J. Bennet --- , South AfricaDespite the long association between hematoxylin and aluminium (Al) in studies of Al rhizotoxicity, it is evident that many aspects of the hematoxylin test are not fully understood. Controlled environment studies of the responses of lucerne and red clover roots... -
Fusarium species in wheat grown from head blight infected seed
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. H.P. Boshoff --- Department of Plant Pathology, Republic of South Africa Z.A. Pretorius --- Department of Plant Pathology, Republic of South Africa W.J. Swart --- Department of Plant Pathology, Republic of South AfricaThe objectives of this preliminary study were to identify Fusarium species associated with wheat seed obtained from head blight infected fields and to determine whether the causal organism(s) of head blight could colonise plants systemically from infected seed. Six Fusarium... -
Sucrose synthesis and translocation in Zea mays L. during early growth, when subjected to N and K deficiency
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.C. Pretorius --- Department of Agronomy and Horticulture, Republic of South Africa D.T. Nieuwoudt --- Department of Agronomy and Horticulture, Republic of South Africa Diana Eksteen --- Department of Agronomy and Horticulture, Republic of South AfricaBy omitting N and K either separately or in combination from the rooting medium, a nutrient stress condition was created with the aim of ascertaining whether sucrose synthesis or its translocation was linked to nutrient availability (N, K) in young... -
Yield components of samples of two wild Mexican common bean (Phaseolus vulgaris L.) populations grown under cultivation
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.S. Bayuelo-Jiménez --- Botánica, Instituto de Recursos Naturales, México C.B. Peña-Valdivia --- Botánica, Instituto de Recursos Naturales, México J. Rogelio Aguirre R. --- Instituto de Investigación en Zonas Desérticas, México.The common bean (Phaseolus vulgaris L.) is an annual crop legume with wild ancestors distributed from Mexico to northern Argentina. In Mexico, wild populations occur throughout this physiographically and climatically diverse country. Such a wide distribution of common bean populations... -
Manipulation of acrotony in one-year-old apple shoots
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.C. Cook --- Department of Horticultural Science, Republic of South Africa K. Verhaegen --- , Belgium J. Keulemans --- , Belgium G. Jacobs --- Department of Horticultural Science, Republic of South AfricaUnbranched rooted layers of the rootstock Mailing 9 (M.9 clone Nie 29) ≈600 mm long were treated twice in autumn (4 and 13 October 1995) in the stoolbed as follows: a) non-treated control; b) the distal 300 mm of the... -
Calibration and validation of the SWB model for sunflower (Helianthus annuus L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.Z. Jovanovic --- Department of Plant Production and Soil Science, Republic of South Africa J.G. Annandale --- Department of Plant Production and Soil Science, Republic of South Africa A.A. Nel --- , Republic of South AfricaThe Soil Water Balance (SWB) generic crop growth and irrigation scheduling model was used to simulate the crop growth and soil water balance of sunflower (Helianthus annuus L. c v. CAR 1199 and SO 306) grown at Rietrivier. The objectives... -
The aluminium response network in Themeda triandra Fosk. III: Regulatory mechanisms and aluminium tolerance
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.J. Bennet --- , Republic of South Africa J.E. Granger --- , Republic of South AfricaAluminium toxicity was investigated by analyzing the reaction of hydroponically-grown plants of two ecotypes of T. triandra to Al (0, 25, 50, 100 μM; pH 4.1; for 28 days). The Al-tolerant 'Berg ecotype responded to the Al treatments by increasing... -
Use of solid waste bagasse from a paper mill as an organic amendment and its effect on some soil properties: a case study
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.C. Hughes --- Soil Science, South Africa S. J.A. Girdlestone --- Soil Science, South AfricaAt a paper mill in KwaZulu-Natal, South Africa bagasse waste was disposed of by burying it in a layer resulting in variable sugar cane growth. The waste was mostly organic fibres, had a high water holding capacity, and contained small... -
Effects of early winter gibberellic acid and mineral oil applications on flowering of young non-bearing clementine (Citrus reticulata Blanco.) and satsuma (Citrus unshiu Marc.) trees
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.J. Mudzunga --- Department of Horticultural Science, South Africa K.I. Theron --- Department of Horticultural Science, South Africa E. Rabe --- Department of Horticultural Science, South AfricaGibberellic acid (GA3) and heavy mineral oil (Bac-oil) treatments, either individually or in combination, applied during the flower initiation period in early winter (April to July) were evaluated as a means to reduce flowering levels in young non-bearing citrus trees... -
The efficacy of liquid seaweed extract on the yield of canola plants
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.I. Ferreira --- Production Technology, Republic of South Africa A.F. Lourens --- , Republic of South AfricaThe efficacy of auxin/cytokinin (Kelpak) on its own and in a mixture with the herbicide clopyralid (Lontrel 100), for post-emergence application at various growth stages in canola (Brassica napus) was assessed. A Kelpak foliar application at 2 I ha−1 applied... -
The effect of plant-growth regulators on the production of out-of-season greenhouse tomatoes (Lycopersicum esculentum)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C. S.M. van Tonder --- , Republic of South-Africa N. J.J. Combrink --- , Republic of South-AfricaThe yield of greenhouse tomatoes produced in spring and midwinter is reduced by unfavourable environmental conditions involving low temperatures and low light intensities. This study has evaluated the role of various plant growth regulators including: synthetic cytokinin (CPPU) at 1ml.L−1,... -
Effect of commercially available rhizobacteria strains on growth and production of lettuce, tomato and pepper
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: K.S. Yobo --- Discipline of Plant Pathology, Republic of South Africa M.D. Laing --- Discipline of Plant Pathology, Republic of South Africa C.H. Hunter --- Discipline of Microbiology, Republic of South AfricaSeven microbial products of the genus Bacillus were evaluated under greenhouse and shadehouse conditions for efficacy on lettuce, tomato and pepper as plant growth promoters. Treatments were applied as a drench (106 cfu ml1) directly onto seedlings in composted pine... -
Initial growth potential and biomass production of field established guayule (Parthenium argentatum Gray.) cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.R. Bekaardt --- , South Africa P.J. Pieterse --- Department of Agronomy, South Africa E.M. Reinten --- , South Africa G.A. Agenbag --- Department of Agronomy, South AfricaThe initial growth potential and biomass production of four guayule cultivars under dryland conditions were investigated at different localities in South Africa. Growth (plant survival, height, canopy diameter, stem diameter) and biomass (wet and dry mass) were recorded for (1)... -
Protein concentration in response to water stress in Themeda triandra Forsk
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: I.B. Oosthuizen --- Department of Animal, H.A. Snyman --- Department of Animal, J.C. Pretorius --- Department of Soil, Crop and Climate Sciences, South AfricaThe influence of water stress on the concentration of water-soluble protein growth reserves was determined during three growth stages (vegetative, pipe and reproductive) as well as in three plant parts (roots, stubble and leaves) for the indigenous C4 semi-arid grass... -
Ameliorative effects of calcium on growth and mineral uptake of salt-stressed amaranth
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: E.N. Ornami --- Department of Plant Production and Soil Sciences, South Africa P.S. Hammes --- Department of Plant Production and Soil Sciences, South AfricaThe detrimental effects of salinity stress in plants may be ameliorated by calcium. However, little is known concerning the efficacy of different calcium sources, especially in amaranth. Two amaranth genotypes (Amaranthus tricolor and A. cruentus) were grown in a greenhouse... -
Effect of chemical seed treatment on the germination and seedling growth of canola under different soil conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.J. De Villiers --- Department of Agronomy, South Africa S.C. Lamprecht --- , South Africa G.A. Agenbag --- Department of Agronomy, South AfricaStudies in a temperature controlled greenhouse were conducted to determine if phytotoxic effects of chemical seed treatments found in incubation studies also have an effect on the germination- and seedling vigour of canola (cv Varola 44) seed planted in simulated... -
Water and nutrient retention by Aquasoil® and Stockosorb® polymers
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.G. Ghebru --- Department of Plant Production and Soil SCience, South Africa E.S. du Toit --- Department of Plant Production and Soil SCience, South Africa J.M. Steyn --- Department of Plant Production and Soil SCience, South AfricaWater retention and hydration rate of Aquasoil and Stockosorb polymers, the effects of these polymers on the water, ammonium and nitrate retention of a pine bark growth medium and the response of the polymers to fertilizer solutions were investigated. Aquasoil... -
Comparison between traditional and scientific irrigation scheduling practices for furrow irrigated potatoes (Solanum tuberosum L.) in Ethiopia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: EB Geremew --- Department of Plant Production and Soil Science, South Africa JM Steyn --- Department of Plant Production and Soil Science, South Africa JG Annandale --- Department of Plant Production and Soil Science, South AfricaTraditional irrigation schemes constitute about 40% of the total irrigated land in Ethiopia. Despite this, the sector has been overlooked and not supported by improved water management technologies. A survey conducted on one of the schemes, Godino, indicated that farmers... -
Wheat (Triticum aestivum L.) growth and yield response to saline irrigation water under controlled conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S.B. Dikgwatlhe --- , South Africa G.M. Ceronio --- , South Africa L.D. van Rensburg --- , South AfricaSerious agronomic problems occur where saline water is used for irrigation. The effect of irrigation water salinity on wheat was investigated using electrical conductivity (ECi, mS m−1) as a salinity indicator. A pot experiment was conducted at the University of... -
Bio-stimulatory properties in seeds of plants from the families Caryophyllaceae and Fabaceae with application potential in agriculture
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.C. Pretorius --- , South Africa A. Du Plessis --- , South Africa E. van der Watt --- , South AfricaA comparative investigation into the bio-stimulatory activity of seed suspensions from two South African plant species belonging to each of the families Caryophyllaceae and Fabaceae were conducted using ComCat®, a commercially available bio-stimulant, as a positive control. These included Acacia... -
Root dynamics of Themeda triandra Forsk. in relation to water stress and defoliation at different phenological stages
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: I.B. Oosthuizen --- Department of Animal, Wildlife and Grassland Sciences, South Africa H.A. Snyman --- Department of Animal, Wildlife and Grassland Sciences, South AfricaThe impact of water stress on root growth for the indigenous apomectic C4-grass species Themeda triandra was determined over a growing season covering three growth stages (vegetative, pipe and reproductive), as well as for regrowth occurring to one, three and... -
Morpho-physiological response of durum wheat genotypes to drought stress
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: K.F. Solomon --- Department of Plant Sciences, South Africa M.T. Labuschagne --- Department of Plant Sciences, South AfricaThe impact of moisture stress on phenology and growth varies for genotypes and the growth stages at which stress is encountered. The aim of this study was to determine the effect of moisture stress on some morpho-physiological traits of durum... -
Effect of nitrogen levels and sources on production of Swiss Chard (Beta vulgaris var. Cicla)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.M. Engelbrecht --- Department of Soil, Crop and Climate Sciences, South Africa G.M. Ceronio --- Department of Soil, Crop and Climate Sciences, South Africa P.C. Motseki --- Department of Soil, Crop and Climate Sciences, South AfricaTo optimise the production of Swiss chard, high levels of nitrogen fertiliser are often applied. This may have adverse effects on both the economy of fertilisation and the nutritional value of the human diet. Very little is known about both... -
Effect of pine bark goat manure medium on seedling growth and N, P, K concentration of various vegetables
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.T. Mupondi --- Department of Agronomy, Faculty of Science and Agriculture, South Africa P.N.S. Mnkeni --- Department of Agronomy, Faculty of Science and Agriculture, South Africa P. Muchaonyerwa --- Department of Agronomy, Faculty of Science and Agriculture, South AfricaPine bark compost is the medium of choice for seedling growers in South Africa due to its availability, low cost and good physical properties. However, it is acidic, has low electrical conductivity (EC) and nutrient content such that fortification and... -
Effect of an organic plant fertiliser on the establishment of rooted cuttings of two species of Cyclopia (honeybush)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: MM Mbangcolo --- Department of Agronomy, South Africa EY Reinten --- Department of Agronomy, South Africa GA Agenbag --- Department of Agronomy, South AfricaThe effect of different application rates of an organic plant fertiliser (Nitrosol®) on the establishment and early growth of rooted cuttings of Cyclopia (Fabaceae) species was evaluated. Rooted terminal and subterminal cuttings of C. intermedia and C. genistoides were transplanted... -
Response of carrot (Daucus carota L.) yield and quality to organic fertiliser
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Alice N Mbatha --- Department of Soil, Crop and Climate Sciences, South Africa Gert M Ceronio --- Department of Soil, Crop and Climate Sciences, South Africa Gesine M Coetzer --- Department of Soil, Crop and Climate Sciences, South AfricaA field study was conducted at Umsunduze Training Centre, KwaZulu-Natal, for two seasons (2005 and 2006) to determine the response of carrot (Daucus carota cv. Kuroda) to organic fertiliser. Three different organic fertilisers were applied at four rates (chicken manure:... -
Effect of shallow tillage and straw mulching on soil water conservation and grapevine response
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Philip A Myburgh --- ARC–Infruitec/Nietvoorbij, South AfricaEffects of shallow tillage and straw mulch thickness on water conservation and grapevine responses were compared to bare, untilled soil in a Sauvignon blanc/99R vineyard near Stellenbosch from 1995 to 1997. Shallow tillage to a depth of 6 cm did... -
Age and growth of two populations of West Coast steenbras Lithognathus aureti in Namibian waters, based on otolith readings and mark-recapture data
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: J. A. Holtzhausen C. H. KirchnerAge and growth of West Coast steenbras Lithognathus aureti, sampled from two separate populations (northern and southern) along Namibia's coast, was determined using sectioned otoliths, and the results were validated using mark-recapture data. For both populations, the special three-parameter Von... -
Reseeding of mussels on denuded rocky shores: preliminary studies with the brown mussel Perna perna
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: A. H. Dye N. DyantyiA method is developed to establish clumps of mussels Perna perna in denuded areas on high-energy rocky shores on the south-east coast of South Africa. A total of 20 small (20–30 mm total length) mussels is placed under a 30... -
Life history of white stumpnose Rhabdosargus globiceps (Pisces: Sparidae) off South Africa
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: M. H. Griffiths C. Wilke A. J. Penney Y. MeloFishery-dependent and fishery-independent distribution analyses together reveal four discrete areas of white stumpnose Rhabdosargus globiceps abundance between Port Nolloth and the Kei River off the Cape Province of South Africa: the Western Cape (Saldanha Bay), the South-Western Cape, the Southern... -
Age and growth of the spinner shark Carcharhinus brevipinna (Müller and Henle, 1839) off the KwaZulu-Natal coast, South Africa
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: B. R. Allen S. P. WintnerAge and growth of the spinner shark Carcharhinus brevipinna off the KwaZulu-Natal coast of South Africa was investigated from vertebral growth ring counts of 67 specimens (54–213 cm precaudal length, PCL). Counts were made from sectioned vertebral centra by two... -
The effects of kelp harvesting on its regrowth and the understorey benthic community at Danger Point, South Africa, and a new method of harvesting kelp fronds
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: G. J. Levitt R. J. Anderson C. J. T. Boothroyd F. A. KempAt Danger Point, South Africa, mariculture of the abalone Haliotis midae has led to increased demand for freshly harvested kelp Ecklonia maxima. This study estimates the biomass of E. maxima available for harvesting, investigates the effects of harvesting on the... -
Reproduction, growth and migrations of sei whales Balaenoptera borealis off the west coast of South Africa
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: P. B. Best C. H. LockyerResults of the examination of 1 062 sei whales Balaenoptera borealis landed at the whaling station at Donkergat, Saldanha Bay, South Africa, in the 1962 and 1963 whaling seasons are presented. Sei whales were usually encountered off the edge of... -
THE EFFECT OF TEMPERATURE ON SPECIFIC GROWTH RATE AND ACTIVATION ENERGY OF MICROCYSTIS AND SYNECHOCOCCUS ISOLATES RELEVANT TO THE ONSET OF NATURAL BLOOMS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: G. H.J. Krüger --- Department of Botany, South Africa J.N. Eloff --- Department of Botany, South AfricaTo investigate the correlation between temperature and the appearance of Microcystis blooms in nature, the effect of temperature on the growth of four Microcystis izolates (two toxic and two non-toxic) was investigated. The lower temperature limit for Microcystis varied between... -
THE EFFECT OF AGITATION AND TURBULENCE OF THE GROWTH MEDIUM ON THE GROWTH AND VIABILITY OF MICROCYSTIS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: G. H.J. Krüger --- Departement of Botany, South Africa J.N. Eloff --- Departement of Botany, South AfricaObservation of natural blooms of Microcystis, suggested that increased turbulence plays a role in retarding bloom formation of Microcystis. In laboratory experiments the influence of turbulence mediated by a magnetic stirrer on the growth and viability of Microcystis in batch... -
THE INTERRELATIONSHIPS BETWEEN THE BIOLOGICAL AND PHYSICO-CHEMICAL PARAMETERS IN THE WATER PHASE OF SESHEGO DAM, NORTHERN TRANSVAAL
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: Antoinette Jooste --- Department of Zoology and Biology, South AfricaSeshego Dam, Lebowa, was investigated over a period of 15 months (1974 – 1975). The interrelationships between biological parameters such as Biological Growth Potential (BGP), anaerobic fecal and coliform bacteria, Cladocera and Copepoda were established by means of factor and... -
POSSIBLE ADAPTIVE SIGNIFICANCE OF SEX RATIO AND SEXUAL DIFFERENCES IN SIZE AT MATURITY IN THE ORANGE RIVER LABEO, LABEO CAPENSIS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: I.G. Gaigher --- Department of Nature and Environmental Conservation, South Africa K. C.D. Hannnan --- Department of Nature and Environmental Conservation, South Africa S.C. Thorne --- Department of Nature and Environmental Conservation, South AfricaLabeo capensis spawns on inundated vegetation during flood periods. Suitable conditions for spawning are of short duration and do not allow time for extended breeding behaviour. The success of fertilisation is therefore probably independent of the size of males. This... -
AGE, GROWTH, REPRODUCTION AND MORTALITY OF THE BUTTER-CATFISH EUTROPIUS DEPRESSIROSTRIS (SCHILBEIDAE: PISCES) IN THE LUPHEPHE NWANEDZI IMPOUNDHENT, VENDA (SOUTH AFRICA)
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: T. Hecht --- Department of Zoology, South AfricaAspects of the biology of Eutropius depressirostris in the Luphephe-Nwanedzi impoundment in north-east Venda (South Africa 30° 25' E, 23° 14' S) have been investigated. The Von Bertalanffy equation -
THE TEMPERATURE-GROWTH RATE RELATIONSHIPS OF AEROBIC HETEROTROPHIC BACTERIA ISOLATED FROM A SILT-LADEN IMPOUNDMENT
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: D.F. Toerien --- , South AfricaThe temperature-growth rate responses of bacterial isolates from Wuras Darn, a silt-laden, highly turbid impoundment were described well by Arrhenius equations. Activation energies varied from 10, 15 to 29, 59 kcal moles−1, indicating a varied response to temperature changes. Since... -
LEAF AREA AS A MEASURE OF STANDING CROP OF FLOATING AQUATIC MACROPHYTES
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: P.C. Keulder --- Department of Botany, South AfricaLeaf area is evaluated as a measure of standing crop of Salvinia molesta Mitchell and Azolla filiculoides Lam. cultures under controlled conditions. Growth rates as derived from leaf area determinations agreed with pigment extractions and fresh and dry weight measures... -
A COMPARISON OF DIFFERENT METHODS OF AGE DETERMINATION IN THE SHARPTOOTH CATFISH CLARIAS GARIEPINUS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: Douglas Clay --- Department of Zoology, U. K.Growth of the sharptooth catfish Clarias gariepinus from four southern African impoundments was estimated by back-calculating age from vertebrae and spines. Length frequency analysis supported the growth estimates derived from vertebrae but not those from spines.- Spines under-estimated the age... -
AGE AND GROWTH OF LABEO UMBRATUS (PISCES: CYPRINIDAE) IN LAKE LE ROUX ON THE ORANGE RIVER, SOUTH AFRICA
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: GlennS. Merron --- , South Africa Tumi Tómasson --- , South AfricaAge, growth and relative body condition of Labeo umbratus in Lake le Roux were investigated from samples collected from 1979 to 1982. Annuli are formed once a year on the scales and otoliths as growth commences in spring or early... -
A PRELIMINARY ASSESSMENT OF THE IMPACT OF SOME ASPECTS OF THE HARTBEESPOORT DAM ENVIRONMENT ON PRODUCTION OF THE MAJOR FISH SPECIES
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: K.L. Cochrane --- , South AfricaThe dominant species of fish in Hartbeespoort Dam, in terms of mass composition of catches, are shown to be Oreochromis mossambicus (Peters), Cyprinus carpio Linnaeus and Clarias gariepinus Burchell. Minimum winter temperatures are demonstrated to have a major impact on... -
PRODUCTION OF THE AFRICAN CATFISH (CLARIAS GARIEPINUS) I. GROWTH, MORTALITY AND YIELD SOUTH OF THE ZAMBEZI
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: Douglas Clay --- Marine Fish Division, Department of Fisheries and Oceans, CanadaClarias gariepinus were sampled from eight water bodies in southern Africa between 1973 and 1975. Aging results indicate a similar growth pattern for most areas with a near linear age-length relationship. Between year growth compensation was found to be present... -
AN ASSESSMENT OF THE GROWTH RATE OF MPASA, OPSABIDIUM MICROLEPIS (GUNTHER, 1864) (PISCES: CRYPRINIDAE), BY LENGTH FREQUENCY ANALYSIS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: D. Tweddle --- Fisheries Department, MalawiThe mpasa, Opsaridium microlepis, is an important commercial species in areas of Lake Malawi near major inflowing rivers during annual spawning migrations. Plots of length frequency data collected over a series of years from mpasa catches in the Bua and... -
MODELS OF ECOSYSTEMS AND AQUATIC ENVIRONMENTS: DEVELOPMENT AND APPLICATION
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: B.R. Allanson --- , South AfricaAn historical treatment of a number of principal events is given. This leads to an assessment of the current research approach in hydrobiology and its success in the development of process orientated ecosystem component models. With the contemporaneous development of... -
Diet selection of goats in the communally grazed Richtersveld National Park
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: HH Hendricks PA Novellie WJ Bond JJ MidgleyThe study provided an account of the diet selection of goats within the Richtersveld National Park and focused on (a) diet composition, (b) plant growth-forms, (c) principal and preferred food plants. The conservation status of these food plants was also... -
Impact of water stress on growth reserves and re-growth of Themeda triandra (Forssk) following defoliation
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: I B Oosthuizen H A SnymanThe influence of water stress and defoliation on the concentration of total non-structural carbohydrates (TNCC) and water-soluble protein (WSPC) as growth reserves after defoliation were determined in the indigenous C4 semi-arid grass species Themeda triandra during three growth stages (vegetative,... -
The effect of defoliation environment on primary growth allocation and secondary tiller recruitment of two bunchgrasses
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: KW Tomlinson TG O'ConnorCompositional shifts of bunchgrass species in the Southern Tall Grassveld in response to different combinations of non-selective mowing and burning appear to reflect differences in growth strategy among species, but there are few studies of South African grasses designed to... -
Effects of herbivory on above- and below-ground biomass partitioning in two arid-zone dwarf shrubs
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: G Oba CS Bjorå I NordalBiomass partitioning by arid-zone dwarf shrubs between above- and below-ground fractions could be influenced by plant adaptations to herbivory. The response of potted Indigofera spinosa and I. cliffordiana to heavy and moderate top defoliations, compared to non-defoliated controls, was investigated... -
Influence of moisture stress on growth, dry matter yield and allocation, water use and water-use efficiency of four Indigofera species
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: A Hassen NFG Rethman Z Apostolides WA van NiekerkThe effects of moisture stress were evaluated in four Indigofera species (I. amorphoides, I. arrecta, I. coerulea and I. vicioides) using a pot experiment under glasshouse conditions. The aim was to examine the influence of moisture-deficit stress on physiological attributes... -
Research note: Quantification of the effects of defoliation on grass vigour
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: K.P. Kirkman --- Department of Agriculture, Republic of South Africa A. Moore --- , Republic of South AfricaThe quantification of defoliation effects on grass vigour is important in understanding veld response to differential management. Effect of grazing on vigour can be determined by measuring regrowth during the season following grazing and comparing treatments with an undefoliated control... -
Plant and sward response to patch grazing in the Highland Sourveld
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: B.U. Lütge --- Department of Grassland Science, Republic of South Africa M.B. Hardy --- KwaZulu‐Natal Department of Agriculture, Republic of South Africa G.P. Hatch --- Department of Grassland Science, Republic of South AfricaSelective grazing by livestock inevitably results in patch grazing. This study was initiated to determine the effects of patch grazing on (1) the vigour of a single grass species, Themeda triandra, and of the sward, and (2) sward species composition... -
Effect of clipping on wall barley (Hordeum murinum L.): Tillering and forage production
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: M.J. El‐Shatnawi --- Department of Natural Resources and the Environment, Faculty of Agriculture, Jordan H.Z. Ghosheh --- Department of Plant Production, Faculty of Agriculture, JordanThe response of wall barley (Hordeum murinum L) to clipping height at various stages of growth was investigated in the semi‐arid grassland of northeastern Jordan in the 1994/1995 and 1995/1996 growing seasons. Treatments included combinations of clipping heights (5 or... -
Host plants of Osyris lanceolata (African Sandalwood) and their influence on its early growth performance in Tanzania
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: P.L. Mwang'ingo Z. Teklehaimanot L.L. Lulandala S.T. MwihomekeIdentification of the host plants of the hemi-parasitic African sandalwood (Osyris lanceolata) and the influence of some on its early growth performance was investigated at Image, Nundu, Sao Hill and Iringa in the southern highlands of Tanzania. The aim was... -
Prescribed under-canopy burning in Pinus patula plantations of the Mpumalanga highveld: The effects of fire on tree growth
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: TheresaL. Bird MaryC. ScholesThe effect of controlled undercanopy burning on tree growth has been studied under 16-year-old Pinus patula trees in Mpumalanga. Three fire intensity treatments and a control "no-burn" treatment, were applied to 1 ha plots. Average fuel depth was 42cm with... -
The effect of planting density on the wood quality of South African-grown Eucalyptus grandis
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: F.S. MalanThis paper presents the results of a wood property and sawn board quality study performed on disc samples and sawlogs taken from a 23-year-old Eucalyptus grandis Nelder 1a spacing trial at J.D.M. Keet plantation near Tzaneen. Ten trees from each... -
Age determination of miombo species Brachystegia spiciformis (Leguminosae – Caesalpinoideae) in Zimbabwe using growth rings
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: I.M. GrundyThe objective of this study was to determine whether Brachystegia spiciformis Benth. (Leguminosae – Caesalpinoideae), one of the dominants of dry miombo woodland in Zimbabwe, forms annual growth rings. In the past the production of effective cutting rotations and sound... -
The effects of ontogenetic maturation in Pinus patula – Part II: Hedge cycling and field performance
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: R. G. Mitchell N. B. JonesEarly studies suggest that the juvenile period, during which favourable rooting can be achieved from Pinus patula seedling hedges, may be as short as 2 years from the date of sowing. If the effects of hedge maturation cannot be delayed,... -
A comparison of different planting methods, including hydrogels, and their effect on eucalypt survival and initial growth in South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: PaulW.M. Viero KeithM. LittleResearch to minimize mortality and enhance early growth during the re-establishment of eucalypts includes the use of optimum growing stock and planting techniques, the application of adequate volumes of water at planting (where appropriate), correct fertilizer application and placement, and... -
Growth performance of lesser-known Leucaena species/provenances at Gairo inland plateau, Morogoro, Tanzania
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: E. Edward S.A.O. Chamshama A.G. MugashaGrowth performance and psyllid resistance was studied among nineteen lesser-known Leucaena species/provenances at Gairo inland plateau, Morogoro, Tanzania. Assessment was done at irregular intervals for survival, root collar diameter and diameter at 30 cm above the ground, height, diameter at... -
Performance of Podocarpus falcatus Provenances in South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: C.J. Geldenhuys --- Division of Water, Environment and Forestry Technology, G.B. von dem Bussche --- ,Podocarpus falcatus, a canopy tree of the mixed evergreen forests in South Africa, is planted in riparian zones in commercial forestry areas. In 1982 provenance trials were initiated to evaluate the performance of 11 provenances in three experimental sites: De... -
Growth modelling of Pinus roxburghii in South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: E.R. Falkenhagen --- , South AfricaThe growth in diameter at breast height, height and tree volume and plot density were studied in an unreplicated spacing trial of Pinus roxburghii at Weza, South Africa. -
A Site-growth Study of Eucalyptus grandis in the Mpumalanga Escarpment Area
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: J.H. Louw --- ,A site-growth study was conducted on Eucalyptus grandis on the granitic soils of the Mpumalanga escarpment area. The objectives were twofold, namely to identify those site factors that can be related to the growth of the species, as well as... -
Fourteen Year Performance of Eucalyptus Species/Provenances, Casuarina equisetifolia, Leucaena leucocephala and Senna siamea at Michafutene, Mozambique
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: A.G. Mugasha --- Department of Forest Biology, Faculty of Forestry, Tanzania P.A. Wate --- Centro de Experimentacao Florestal (CEF), S. A.O. Chamshama --- Department of Forest Biology, Faculty of Forestry, TanzaniaVariation in performance of several Eucalyptus species/provenances/land races, Casuarina equisetifolia, Leucaena leucocephala and Senna siamea was evaluated in two 14—year old trials planted at Michafutene, Mozambique. At the age of 6, 10, and 14 years, data were collected of survival,... -
A Survey of Tree Planting Practices in the Smallholder Farming Sector of Zimbabwe
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: EnosM. Shumba --- Forest Research Centre, Zimbabwe Abisai Mushaka --- Forest Research Centre, Zimbabwe Joseph Muchichwa --- Forest Research Centre, ZimbabweGroup meetings and individual farm visits were used to establish current tree planting practices in the smallholder farming sector of Zimbabwe. The number of tree species planted in each of the eight districts studied ranged from nine to 27 with... -
A review of site-growth studies in South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: J.H. Louw --- ,The intensive nature of the South African forest industry requires reliable decision support systems to enhance site-specific silviculture. Furthermore, the principle of ecologically sustainable forest management requires a profound improvement in the understanding of the factors controlling tree growth and... -
The survival, growth and wood basic densities of 14 year old Eucalyptus camaldulensis at Michafutene, Mozambique
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: P.A. Wate --- Centro de Experimentacao Florestal (CEF), Mozambique S. A.O. Chamshama --- Department of Forest Biology, Faculty of Forestry & Nature Conservation, Tanzania A.G. Mugasha --- Department of Forest Biology, Faculty of Forestry & Nature Conservation, TanzaniaA species and provenance trial for Eucalyptus (11 Eucalyptus camaldulensis provenances and 1 Eucalyptus tereticornis) was established at Michafutene, Mozambique in March 1982. Data on survival, growth, yield, stem characteristics and wood basic density have been analysed. Assessments were done... -
Control of Eucalyptus grandis cut-stumps of single-stem origin
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: K.M. Little --- , Republic of South Africa N.S. Eccles --- , Republic of South AfricaFour methods to control coppice re-growth on single-stem cut-stump Eucalyptus grandis stools were tested in the Zululand region of KwaZulu-Natal. The methods used were the burning of the plantation residue as opposed to a no-burn control, the application of triclopyr... -
Staining roots to determine root growth potential of Pinus taeda
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Janusz Zwolinski --- Forestry Programme, South Africa CurtM. Peterson --- Department of Botany and Microbiology, USA Colin Dyer --- , South AfricaRoot growth potential (RGP) consists of two components: elongation of existing roots and initiation of new roots. Currently, RGP is determined on planting stock from which any “white roots” present at the start of the test are removed. This study... -
Water use efficiency in South African Eucalyptus plantations: A review
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: PeterJ. Dye --- Faculty of Science and Agriculture,The relation between rainfall and Eucalyptus stem growth is investigated using data recorded at three ICFR espacement trials in kwaZulu-Natal. These data show that, for a given rainfall amount, large differences in stem growth may occur at different sites. The... -
Development of Community Psychology
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Florence Chamvu --- University of Zambia, Jacqueline P. Jere-Folotiya --- University of Zambia, Kalima Kalima --- University of Zambia,The growth and development of community psychology in Zambia has been necessitated by many social problems encountered by Zambians be they health, economic or psychological. The work of governmental and nongovernmental organizations at community level has contributed to the development... -
The Effect of Narrative Career Facilitation on the Personal Growth of a Disadvantaged Student—A Case Study
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Jacobus G. Maree --- University of Pretoria, Liesel Ebersöhn --- University of Pretoria, Angelique Biagione-Cerone --- University of Pretoria,This article describes the effect of narrative career facilitation on the personal growth of a disadvantaged undergraduate student at a tertiary institution in South Africa. The participant was selected purposively from among a group of undergraduate students at the tertiary... -
The Prevalence of Coping Behaviour, Posttraumatic Growth and Psychological Well-Being in Women who Experienced Childhood Sexual Abuse
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Hayley J. Walker-Williams --- North-West University, South Africa Chrizanne van Eeden --- North-West University, South Africa Karen van der Merwe --- North-West University, South AfricaThis study investigated the prevalence of coping behaviour, posttraumatic growth and psychological well-being in adult South African women (n=60, mean age=32, ethnicity=70% European, 28% African and 2% Asian descent). Specifically, the study considered the prevalence of constructive coping, posttraumatic growth... -
Coping Behaviour, Posttraumatic Growth and Psychological Well-Being in Women with Childhood Sexual Abuse
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Hayley J. Walker-Williams --- North-West University, South Africa Chrizanne van Eeden --- North-West University, South Africa Karen van der Merwe --- North-West University, South AfricaThis study investigated the coping behaviours and posttraumatic growth of women with sexual abuse in childhood (CSA) and long-term effects on their psychological well-being in adulthood. Participants were 10 women survivors of CSA (ages ranging from 23–48 years). Data on... -
The biology of Barbus mattozi Guimaraes (Teleostei, Cyprinidae) in a Zimbabwean reservoir. 3. Numbers, biomass and mortality
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BG Donnelly BE MarshallThe population of B. mattozi in the Mtsheleli Dam, Zimbabwe, was estimated to be about 55 000 fish in July 1974 but fell to about 370 by June 1975. The total biomass followed a similar trend, reaching 2 000kg (43kg... -
Growth, reproduction and population structure of Diplotaxodon limnothrissa in the southeast arm of Lake Malawi
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GeoffreyZ Kanyerere OlafLF Weyl AnthonyJ BoothDiplotaxodon limnothrissa is a widely distributed species occurring throughout Lake Malawi from the surface to a depth of at least 220m. It is probably the most abundant cichlid in the lake, with biomass estimates of around 87 000t in the... -
Effects of three agricultural by-products on cage culture growth performances of a landlocked population of Sarotherodon melanotheron (Teleostei: Cichlidae) in man-made Lake Ayame, Côte d'Ivoire
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NI Ouattara V N'Douba GG Teugels JC PhilippartIn man-made Lake Ayame, a 180-day cage culture feeding trial was conducted to investigate the effects of three agricultural by-products — chicken droppings, wheat bran and corn bran — on the survival rates, mean daily weight gain and feed conversion... -
The trophic position of planktonic ciliate populations in the food webs of some East African lakes
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AndrewW Yasindi WilliamD TaylorThe trophic role of planktonic ciliates was investigated in the food webs of 17 East African lakes of different salinity and trophy. Experiments with 1μm latex beads showed that Cyclidium, Halteria, Dysteria, Aspidisca and Vorticella are bacterivores. Examination of food... -
Predictor variables for moggel (Labeo umbratus) biomass and production in small South African reservoirs
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: WM Potts AJ Booth T Hecht TG AndrewThe biomass and production of moggel, Labeo umbratus, in five small previously unexploited Eastern Cape reservoirs were estimated and related to environmental conditions. Biomass and production estimates varied widely between the reservoirs. Whilst the production/biomass ratio was not a good... -
The life history and fishery potential of Labeo umbratus (Teleostei: Cyprinidae) in five small South African reservoirs
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: WarrenM Potts AnthonyJ Booth Thomas Hecht TimothyG AndrewThe life histories of five populations of moggel, Labeo umbratus, inhabiting small Eastern Cape reservoirs were compared and the differences related to environmental parameters. A significant positive correlation between fish growth and chlorophyll a was noted in four cases. In... -
Comparative analysis of the aquaculture potential of hybrid Tilapia zillii (male) × T. guineensis (female) (Teleostei: Cichlidae) in floating cages, cement tanks and earth ponds
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CélineSK Nobah Tidiani Koné Valentin N'Douba Jos Snoeks Gouli Gooré Bi EssetchiP KouamélanThe effect of three rearing systems, floating cages, cement tanks and earth ponds, on the growth rate, feeding efficiency and mortality rates of hybrid tilapia — Tilapia zillii (male) × T. guineensis (female) — was evaluated for 233 days. Fish... -
The biology of Barbus mattozi Guimaraes (Teleostei: Cyprinidae) in a Zimbabwean reservoir. 2. Growth
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BG Donnelly --- Department of National Parks and Wildlife Management, Zimbabwe BE Marshall --- Department of Biological Sciences, ZimbabweThe growth of Barbus mattozi was investigated in the Mtsheleli Dam, a small Zimbabwean reservoir. Scale rings were found to be a suitable method of determining growth, the rings being laid down in October, just before the rainy season. There... -
The use of bitter kola Garcinia kola dry seed powder as a natural growth-promoting agent for African sharptooth catfish Clarias gariepinus fingerlings
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AA Dada --- Department of Fisheries and Aquaculture Technology, Nigeria NE Oviawe --- Department of Fisheries and Aquaculture Technology, NigeriaThe effect of dietary Garcinia kola seed meal on growth and body composition was investigated in catfish Clarias gariepinus. Fingerlings of about 50 g were fed diets supplemented with four concentrations (50, 100, 150 and 200 g kg−1) of G... -
The effect of feeding regimen on growth, food conversion ratio and size variation in juvenile dusky kob Argyrosomus japonicus (Teleostei: Sciaenidae)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: H Kaiser --- Department of Ichthyology and Fisheries Science, South Africa PD Collett --- Department of Ichthyology and Fisheries Science, South Africa NG Vine --- Department of Ichthyology and Fisheries Science, South AfricaTemperature, feeding frequency and feeding intensity are important determinants of fish growth in aquaculture. As part of a research and development programme to optimise husbandry techniques for a new mariculture species, the dusky kob, Argyrosomus japonicus, this study tested the... -
Effects of wild and farm-grown macroalgae on the growth of juvenile South African abalone Haliotis midae Linnaeus
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DV Robertson-Andersson --- Department of Biodiversity and Conservation Biology, South Africa GW Maneveldt --- Department of Biodiversity and Conservation Biology, South Africa K Naidoo --- Department of Biodiversity and Conservation Biology, South AfricaThe effect of various macroalgal diets on the growth of grow-out (>20 mm shell length) South African abalone Haliotis midae was investigated on a commercial abalone farm. The experiment consisted of four treatments: fresh kelp blades (Ecklonia maxima (Osbeck) Papenfuss)... -
An experimental study on food and salinity preferences of two Brachionus plicatilis rotifer strains from Iran
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: R Malekzadeh Viayeh --- Artemia and Aquatic Animals Research Institute, Iran H Mohammadi --- Department of Fisheries, Faculty of Natural Resources, IranEffects of feeding on four algal species (Chlorella vulgaris, Nannochloropsis oculata, Isochrysis galbana and Scenedesmus obliques) at salinities of 5, 15 and 25 on the population growth parameters of two Iranian strains of the widespread rotifer species Brachionus plicatilis were... -
Evaluation of acoustic transmitter implantation and determination of post-translocation behaviour of largemouth bass Micropterus salmoides in a South African impoundment
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CF Huchzermeyer --- Department of Ichthyology and Fisheries Science (DIFS), South Africa OLF Weyl --- , South Africa PD Cowley --- , South AfricaLargemouth bass Micropterus salmoides are an important angling species that are often displaced during catch-and-release fishing tournaments. The impact of acoustic transmitter implantation on this species and the effect of displacement distance on their behaviour were tested. In April 2010,... -
Validation of the periodicity of growth increment deposition in otoliths from the larval and early juvenile stages of two cyprinids from the Orange–Vaal river system, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BR Paxton --- Water Research Group (Ecology), School of Environmental Sciences and Development, Potchefstroom Campus, South Africa GC O'Brien --- Water Research Group (Ecology), School of Environmental Sciences and Development, Potchefstroom Campus, South Africa JA Slingsby --- South African Environmental Observatory Network, South Africa R Copin --- Zoology Department, South AfricaThis study tested the hypothesis that growth increments in larval largemouth yellowfish Labeobarbus kimberleyensis and smallmouth yellowfish L. aeneus from the Orange–Vaal river system, South Africa, are deposited daily. The periodicity of increment formation was determined by regular sampling and... -
An Integrated System for Forest Management and Silvicultural Planning and Control in South African State Forestry
Item type: Journal Article • Journal: South African Forestry Journal • Authors: H.W. Kassier --- Forest Management Division, Department of Water Affairs, Forestry and Environmental Conservation,A computerised plantation analysis system (COMPAS) for commercial plantation management, planning and control is described and illustrated. Present uses in South African State forestry and future development of the system are discussed. -
Relationship between Growth Rate and Foliar Concentrations of Nitrogen, Phosphorus and Potassium for Eucalyptus grandis
Item type: Journal Article • Journal: South African Forestry Journal • Authors: A. P.G. Schönau --- , Republic of South Africa M.A. Herbert --- , Republic of South AfricaThe growth responses to applications of N, P, K and lime are described briefly for four comprehensive fertiliser experiments with Eucalyptus grandis. Foliar concentrations of N, P and K were determined for these experiments, and their relationship to growth rate... -
Studies of Growth and Stand Structure in Plantations of Pinus patula
Item type: Journal Article • Journal: South African Forestry Journal • Authors: Y. de Villiers --- , A. van Laar --- Faculty of Forestry,Mensurational data collected for management inventories were used to obtain estimates for the parameters of equations with age, and in other cases with age, stand density and site index as predictor-variables, growth and stand structure characteristics as dependent variables. The... -
8. A Different Approach to Site Evaluation and Some Preliminary Results
Item type: Journal Article • Journal: South African Forestry Journal • Authors: A. P.G. Schönau --- , R.C. Purnell --- de Wet Forestry Research Centre,This paper describes a new approach towards site evaluation of exotic tree species which have a limited and non-representative occurrence. Instead of applying the classical site factor analysis and measuring a considerable number of sample plots of different ages at... -
Growth of Seven-weeks Fern (Rumohra adiantiformis) in the Southern Cape Forests: Implications for Management
Item type: Journal Article • Journal: South African Forestry Journal • Authors: SuzanneJ. Milton --- Botany Department,Fronds of the fern Rumohra adiantiformis are picked in the southern Cape forests and exported. Harvested fern rhizomes produce smaller fronds. Recruitment of juvenile plants to a marketable size class, and recovery in frond size of experimentally defoliated fern rhizomes... -
AN ASSESSMENT OF THE GROWTH RATE OF MPASA, OPSABIDIUM MICROLEPIS (GUNTHER, 1864) (PISCES: CRYPRINIDAE), BY LENGTH FREQUENCY ANALYSIS
Item type: Journal Article • Journal: Southern African Journal of Child and Adolescent Mental Health • Authors: D. Tweddle --- Fisheries Department, MalawiThe mpasa, Opsaridiwm microlepis, is an important commercial species in areas of Lake Malawi near major inflowing rivers during annual spawning migrations. Plots of length frequency data collected over a series of years from mpasa catches in the Bua and... -
MODELS OF ECOSYSTEMS AND AQUATIC ENVIRONMENTS: DEVELOPMENT AND APPLICATION
Item type: Journal Article • Journal: Southern African Journal of Child and Adolescent Mental Health • Authors: B.R. Allanson --- , South AfricaAn historical treatment of a number of principal events is given. This leads to an assessment of the current research approach in hydrobiology and its success in the development of process orientated ecosystem component models. With the contemporaneous development of... -
Population Dynamics and Spawning of the Flatfish Solea Bleekeri and Pseudorhombus Arsius in the Intertidal Area of Inhaca Island, Moçambique
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A. M. P. Van Schie W. F. De BoerThe population dynamics of flatfish Solea bleekeri and Pseudorhombus arsius within the intertidal area of Inhaca Island, Moçambique, was investigated using bottom trawl data collected during summer (December 1996 – March 1997) and winter (June 1997 – August 1997). The... -
Effect of Protein Level and Varying Protein – Lipid Concentrations on Growth Characteristics of Juvenile Spotted Grunter Pomadasys Commersonnii (Haemulidae)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T. Hecht A. Irish J. SalesA 60-day feeding trial was conducted to evaluate the effects of dietary crude protein level on growth, feed conversion and protein efficiency ratio of juvenile (3–6 g) spotted grunter Pomadasys commersonnii. In the experiment, six semi-purified diets containing casein and... -
Age structure or functional response? Reconciling the energetics of surplus production between single-species models and ECOSIM
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K. Y. AydinWhole-ecosystem foodweb models, specifically the dynamic model ECOSIM, contain specific hypotheses for surplus production that differ from traditional single-species management models. Specifically, ECOSIM begins with an assumption that all species are tightly connected and energetic surplus does not arise through... -
The biology and distribution of the monkfish Lophius vomerinus off South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SA Walmsley RW Leslie WHH SauerThe monkfish Lophius vomerinus is economically the most important bycatch species in the South African demersal hake fishery. To assist in the development of a bycatch management plan for the species, age and growth characteristics, reproductive and feeding biology, and... -
Growth and reproduction of the pelagic goby Sufflogobius bibarbatus off the Orange River, southern Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: YC Melo F Le ClusAge, growth and reproduction of the pelagic goby Sufflogobius bibarbatus was investigated for males and females caught in demersal trawls between the Orange River and Port Nolloth on the west coast of southern Africa. Females had larger otoliths than males... -
Do dart tags suppress growth of dusky kob Argyrosomus japonicus?
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MH Griffiths CG AttwoodGrowth rates of dusky kob Argyrosomus japonicus calculated from mark-recapture and otolith-reading methods were compared. Mark-recapture data showed that A. japonicus are resident in an area between the Breede River Estuary and Cape Agulhas on the south-east coast of South... -
Growth patterns of the pearl oyster Pinctada margaritifera L. in Gazi Bay, Kenya
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: KM Mavuti EN Kimani T MukiamaCulture of pearl oysters is rapidly increasing worldwide, including the western Indian Ocean. The oyster Pinctada margaritifera L., which produces the most highly valued black pearls, occurs in East Africa, a nd as been exploited there for the shell for... -
Stock separation and life history of Argyrozona argyrozona (Pisces: Sparidae) on the South African east coast
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SL Brouwer MH GriffithsFishery independent biomass surveys and commercial linefish catch returns were used to elucidate the spatial patterns of carpenter Argyrozona argyrozona distributed along the South African continental shelf. Two distinct areas of abundan ce ere determined, one on the central and... -
Life strategies, energetics and growth characteristics of Calanoides carinatus (Copepoda) in the Angola-Benguela frontal region
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: HM Verheye W Hagen H Auel W Ekau N Loick I Rheenen P Wencke S JonesRates of daily egg production, moulting and egg hatching success, as well as total lipid content and composition of Calanoides carinatus, were measured in the region of the southern Angola Curre nt SAC), the Angola-Benguela Front (ABF) and the coastal... -
Reproductive biology and growth of the yellowbelly rockcod Epinephelus marginatus (Serranidae) from South-East Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ST FennessyInvestigation of the reproductive biology and growth of the yellowbelly rockcod Epinephelus marginatus from South-East Africa confirms that the species is a monandric protogynous hermaphrodite, i.e. males are derived from females, probably as a result of environmental or social cues... -
Growth of alfonsino Beryx splendens Lowe 1834 in the South-West Indian Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MTG Santamaría LJ López Abellán JF GonzálezAge and growth of alfonsino Beryx splendens from South-West Indian Ocean seamounts were studied based on whole otolith readings. Ages of the fish under study ranged between one year and 14 years (15.5–43.5cm fork length). Age distribution was related to... -
Vegetative growth of Noctiluca scintillans containing the endosymbiont Pedinomonas noctilucae
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Furuya H Saito R Sriwoon T Omura EE Furio VM Borja T LirdwitayaprasitVegetative growth of Noctiluca scintillans containing the photosynthetic endosymbiont Pedinomonas noctilucae was investigated in culture and in natural populations. Clonal cultures of N. scintillans containing the endosymbiont, isolated from the inner Gulf of Thailand and Manila Bay, were of two... -
Life-history parameters of white stumpnose Rhabdosargus globiceps (Pisces: Sparidae) in Saldanha Bay, South Africa, with evidence of stock separation
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CG Attwood --- Marine Research Institute, Department of Zoology, South Africa TF Næsje --- , Norway L Fairhurst --- , South Africa SE Kerwath --- Marine Research Institute, Department of Zoology, South AfricaWhite stumpnose Rhabdosargus globiceps were sampled over 24 months in Saldanha Bay on the west coast of South Africa. The species is a rudimentary hermaphrodite, with <1% of mature fish having simultaneously developed ovaries and testes. Spawning activity extended from... -
Life-history strategies of Umbrina robinsoni (Sciaenidae) in warm-temperate and subtropical South African marine reserves
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Hutchings --- Zoology Department and Marine Biology Research Centre, South Africa MH Griffiths --- Department of Environmental Affairs and Tourism, South AfricaBiological data for Umbrina robinsoni were obtained from fish sampled monthly during 2001–2002 by shore-angling in the warm-temperate De Hoop Marine Protected Area (MPA) (n = 312), and by means of spearfishing during three trips (May, September and January 2001–2002)... -
Killer whales in South African waters—a review of their biology
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PB Best --- Mammal Research Institute, South Africa MA Meÿer --- Department of Environmental Affairs, South Africa C Lockyer --- , DenmarkThe distribution, seasonality and schooling behaviour of killer whales Orcinus orca in South African waters have been investigated from 785 records compiled between 1963 and 2009, and their size, morphometrics, growth, reproduction, food and feeding behaviour described from the examination... -
The biology, life history and management needs of a large sciaenid fish, Argyrosomus coronus, in Angola
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WM Potts --- Department of Ichthyology and Fisheries Science, PO Box 94, South Africa WHH Sauer --- Department of Ichthyology and Fisheries Science, PO Box 94, South Africa R Henriques --- School of Biological Sciences, UK S Sequesseque --- , Angola CV Santos --- , Angola PW Shaw --- School of Biological Sciences, UKThe West Coast dusky kob Argyrosomus coronus is an understudied yet important fishery species in Angola. During a five-year study (2005–2009), the species was recorded in all fishery sectors, but was most important in the inshore recreational fishery in southern... -
Settlement patterns, size and growth of puerulus and juvenile rock lobster Jasus lalandii at an oyster farm in Saldanha Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JC Groeneveld --- , South Africa CL Greengrass --- Marine Biology Research Institute, Department of Zoology, South Africa DL van Zyl --- Branch Fisheries, Department of Agriculture, Forestry and Fisheries, South Africa GM Branch --- Marine Biology Research Institute, Department of Zoology, South AfricaTrends in the abundance, size and growth of newly settled pueruli and early juveniles of the rock lobster Jasus lalandii were determined from samples obtained from mesh bags used for oyster mariculture in Saldanha Bay, South Africa. Totals of 3... -
Assessment of South African Umbrina robinsoni based on per-recruit models
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Hutchings --- Zoology Department and Marine Biology Research Centre, South Africa MH Griffiths --- Ministry of Fisheries, New ZealandSlender baardman Umbrina robinsoni are an important component of recreational shore-angler and spearfisher catches along the eastern seaboard of South Africa. Stocks of U. robinsoni at three sites—False Bay, Stil Bay and the KwaZulu-Natal (KZN) coast—were modelled using a per-recruit... -
Aspects of the biology and fisheries of an economically important sparid Dentex macrophthalmus (Bloch 1791) in the Namibe province, Angola
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WM Potts --- Department of Ichthyology and Fisheries Science, PO Box 94, South Africa LA Inácio --- , Angola CV Santos --- , Angola TJ Richardson --- Department of Ichthyology and Fisheries Science, PO Box 94, South Africa WHH Sauer --- Department of Ichthyology and Fisheries Science, PO Box 94, South AfricaThe sparid Dentex macrophthalmus is a widespread, important fishery species along most of the West African coast from southern Namibia to the Mediterranean. In southern Angola it is an important artisanal species targeted predominantly by handline fishers. A biological and... -
An investigation of the effect of temporal variation in growth rate of Umbrina robinsoni on biological reference point estimates calculated using per-recruit models
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Hutchings --- Department of Zoology and Marine Biology Research Centre, South Africa MH Griffiths --- Ministry of Fisheries, New Zealand SJ Lamberth --- Branch Fisheries, Department of Agriculture, Forestry and Fisheries, South AfricaThe effect of temporal variation in growth rate on per-recruit model outputs was investigated by comparing biological reference points obtained using growth curves derived for Umbrina robinsoni populations from False Bay, on the south coast of South Africa, sampled 10... -
Assessment of current data for the octopus resource in Rodrigues, western Indian Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WHH Sauer --- Department of Ichthyology and Fisheries Science, South Africa W Potts --- Department of Ichthyology and Fisheries Science, South Africa D Raberinary --- , UK J Anderson --- , Mauritius MJ Sylvio Perrine --- , RodriguesThe annual catch of octopus in the Rodrigues Lagoon, located east/north-east of Mauritius, has dropped by almost half since 1994. This has prompted concern over the resource and has initiated an assessment of the current status of the stock. The... -
Biology, fisheries and distribution of Thryssa vitrirostris (Gilchrist & Thompson 1908) and other Engraulidae along the coast of the Sofala Bank, western Indian Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Mualeque --- , Mozambique J Santos --- Faculty of Biosciences, Fisheries and Economics, NorwayThe Sofala Bank (16°–21° S) forms a major discontinuity in the gradients of engraulid distribution along the south-eastern African coast. Although the number of species declines southwards, the density and the catches of species associated with higher turbidity increases within... -
Comparison of the population structure and life-history parameters of Diplodus capensis (Sparidae) in exploited and unexploited areas of southern Angola
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TJ Richardson --- Department of Ichthyology and Fisheries Science, PO Box 94, South Africa WM Potts --- Department of Ichthyology and Fisheries Science, PO Box 94, South Africa CV Santos --- , Angola WHH Sauer --- Department of Ichthyology and Fisheries Science, PO Box 94, South AfricaBlacktail seabream Diplodus capensis were sampled from proximate (10 km apart) exploited and unexploited areas in southern Angola to compare their population structures and life-history parameters. Females dominated the larger size and older age classes in the unexploited area. In... -
Population dynamics of southern elephant seals: a synthesis of three decades of demographic research at Marion Island
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PA Pistorius --- Department of Zoology, South Africa PJN de Bruyn --- Department of Zoology and Entomology, University of Pretoria, South Africa MN Bester --- Department of Zoology and Entomology, University of Pretoria, South AfricaSouthern elephant seal Mirounga leonina numbers declined precipitously throughout most of their circumpolar distribution since the 1950s. A long-term intensive demographic programme was initiated in 1983 on the relatively small population of southern elephant seals at sub-Antarctic Marion Island in... -
Growth and survival of the South African scallop Pecten sulcicostatus in suspended culture
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: DCZ Arendse --- Department of Agriculture, Forestry and Fisheries, South Africa GC Pitcher --- Department of Agriculture, Forestry and Fisheries, South AfricaGrow-out studies of the scallop Pecten sulcicostatus, endemic to the South African coast, contribute to an investigation of the suitability of this species for commercial culture. Hatchery-reared juvenile scallops were placed in a suspended culture system at 5 m depth... -
The biology of Barnard's dentex, Dentex barnardi (Teleostei: Sparidae), in southern Angola
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TJ Richardson --- Department of Ichthyology and Fisheries Science, South Africa WM Potts --- Department of Ichthyology and Fisheries Science, South Africa WHH Sauer --- Department of Ichthyology and Fisheries Science, South AfricaBarnard's dentex Dentex barnardi is a relatively slow-growing, late-maturing species with an intermediate longevity (maximum recorded age = 13 years). The length and age structures of the population were similar for males and females; however, the sex ratio was female... -
Validation of growth zone deposition rate in otoliths and scales of flathead mullet Mugil cephalus and freshwater mullet Myxus capensis from fish of known age
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BR Ellender --- Department of Ichthyology and Fisheries Science, South Africa GC Taylor --- Department of Ichthyology and Fisheries Science, South Africa OLF Weyl --- , South AfricaFlathead mullet Mugil cephalus and freshwater mullet Myxus capensis are important components in South African estuarine fish communities and fisheries, but there is little information on their age and growth or age validation. This study validated the periodicity of growth... -
Population dynamics of the seabob shrimp Xiphopenaeus kroyeri (Dendrobranchiata, Penaeidae) in south-eastern Brazil
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GS Heckler --- Departamento de Ecologia, Instituto de Biociências, Brazil SM Simões --- LABCAM (Laboratório de Biologia de Camarões Marinhos e de Água Doce), Departamento de Ciências Biológicas, Faculdade de Ciências, Brazil APF Santos --- LABCAM (Laboratório de Biologia de Camarões Marinhos e de Água Doce), Departamento de Ciências Biológicas, Faculdade de Ciências, Brazil A Fransozo --- Departamento de Zoologia, Instituto de Biociências, Brazil RC Costa --- LABCAM (Laboratório de Biologia de Camarões Marinhos e de Água Doce), Departamento de Ciências Biológicas, Faculdade de Ciências, BrazilThe population dynamics, including the sex ratio, reproductive period, individual growth and longevity, and population structure of the shrimp Xiphopenaeus kroyeri, are described. The shrimps were collected monthly from July 2005 to June 2007 at four sites in Ubatuba Bay,... -
A review of the Oceanographic Research Institute's Cooperative Fish Tagging Project: 27 years down the line
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SW Dunlop --- , South Africa BQ Mann --- , South Africa RP van der Elst --- , South AfricaThe Oceanographic Research Institute's (ORI) Cooperative Fish Tagging Project was initiated in 1984 and is one of the most enduring and successful environmental projects of its kind in South Africa. By the end of 2011, 5 130 anglers had joined... -
Age, growth and reproductive biology of the blue shark Prionace glauca in South African waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: KA Jolly --- Zoology Department, South Africa C da Silva --- Fisheries Research, Department of Agriculture, South Africa CG Attwood --- Zoology Department, South AfricaThe age, growth and reproductive biology of the blue shark Prionace glauca from South African waters were assessed using 205 specimens, ranging in total length (TL) from 72 to 313 cm. Greater number of males (120) than females (85) were... -
Patterns in abundance, population structure and biology of knife prawn Haliporoides triarthrus on deep-water trawl grounds off eastern South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Robey --- Oceanographic Research Institute, South Africa ST Fennessy --- Oceanographic Research Institute, South Africa BI Everett --- Oceanographic Research Institute, South Africa J Santos --- Norwegian College of Fisheries Science, Norway JC Groeneveld --- Oceanographic Research Institute, South AfricaThe deep-water trawl fishery along the KwaZulu-Natal coast of South Africa targets several crustacean species, with the knife (or pink) prawn Haliporoides triarthrus contributing most of the catch. Logbook data of fishing effort and catch between 1988 and 2010 were... -
Innovating the Green Way: Natural Considerations for Sustainable Consumption
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Sajal Kabiraj --- International Center for Organization & Innovation Studies (ICOIS), ChinaLearn everything you can, anytime you can, from anyone you can – there will always come a time when you will be grateful for what you did… Sarah Caldwell The five natural elements (Earth, Water, Fire, Air and Sky), the... -
Inclusive Growth and Institutions: An Analysis of the Employment Structure of India's Tea Plantation Sector
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Namrata Thapa [d858062e18]It is generally held that though the Indian economy has been experiencing high growth in the post-reform period, it is not inclusive and that certain sectors, regions and population of the country are being excluded from the benefits of growth... -
Innovation and Growth in Ugandan Manufacturing Firms
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Aggrey Niringiye --- School of Economics, Uganda Eria Hisali --- School of Economics, UgandaThe aim of this study was to establish the effects of innovation on the growth of Ugandan manufacturing firms' using pseudo panel data. Little is known about the relationship between innovation and firm growth in Sub-Saharan African countries. This study... -
Modelling growth and water use in four Pinus patula stands with the 3-PG model
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors:Accurate prediction ofgrowth andyield offorest plantations remains importantto the forestry industry for such purposes as assessing the benefits ofsilvicultural practices, matching species to site, understanding economic risks, predicting profitability and scheduling harvests. Conventional methodology is based on statistically-derived stand growth... -
Coppicing potential of Eucalyptus nitens: Results from a field survey
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: K. M. Little --- , South Africa G. van den Berg --- , South Africa G. Fuller --- , South AfricaIn order to determine factors which could have a positive influence on the coppicing potential of Eucalyptus nitens, a field survey was carried out at Draycott, near Estcourt in the KwaZulu-Natal Midlands. Five measures ofthe ability to coppice (stump survival,... -
Early performance of Casuarina junghuhniana provenances/land races at Lushoto, Tanzania
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: S.T. Mwihomeket --- , Tanzania A.G. Mugasha --- Department of Forest Biology, Faculty of Forestry and Nature Conservation, Tanzania S.A.O. Chamshama --- Department of Forest Biology, Faculty of Forestry and Nature Conservation, Tanzania M.A. Mgangamundo --- Department of Forest Biology, Faculty of Forestry and Nature Conservation, Tanzania O.C. Kumburu --- Department of Forest Biology, Faculty of Forestry and Nature Conservation, Tanzania Z. Lupala --- Department of Forest Biology, Faculty of Forestry and Nature Conservation, TanzaniaA trial involving 21 provenances form Indonesia and 7 “local” seed sources of Casuarina junghuhniana was established at Lushoto, Tanzania in March 1997. At 22 and 48 months of age, the following characteristics were assessed: survival, root collar diameter (RCD... -
Evaluation of 19 provenances of Calliandra calothyrsus at Gairo and SUA Farm, Morogoro,Tanzania
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: M. Herbert --- Department of Forest Biology, Faculty of Forestry & Nature Conservation, Tanzania A. G. Mugasha --- Department of Forest Biology, Faculty of Forestry & Nature Conservation, Tanzania S.A.O. Chamshama --- Department of Forest Biology, Faculty of Forestry & Nature Conservation, TanzaniaPerformance evaluation was conducted among nineteen provenances of Calliandra calothyrsus from mesa-America, Indonesia and Tanzania. Two trials were established in February and March, 1996 at Gairo (8 provenances) and Sokoine University of Agriculture (SUA) Farm (17 provenances) in Morogoro, Tanzania... -
Water use efficiency: What are the implications for plantation forestry?
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: N.W. Pammenter --- , South AfricaWater use efficiency (WUE) is the ratio of some measure of growth or carbon assimilation to water utilization. It can be considered at the level ofthe leaf, whole plant or stand, and can be expressed in terms of total plant... -
Killing Eucalyptus grandis cut stumps after multiple coppice rotations in the KwaZulu-Natal midlands, South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Keith M. Little --- , Republic of South AfricaThe repeated regeneration of Eucalyptus grandis through the managementofcoppice shoots results inlarge multi-stemmed stumpsthat are difficult to kill To test the most effective mannerinwhichthese stumps could be killed, a trial wasinitiated at felling on a fourth rotation stand of E... -
A review on the effects of donor maturation on rooting and field performance of conifer cuttings
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: R.G Mitchell --- Sappi Forests Research, J. Zwolinski --- Forestry Programme, N.B. Jones --- Sappi Forests Research,The maturation and ageing effects of parent or donor plants have been reported to have both positive and negative influences on the performance of rooted cuttings. A general decline in rooting ability, root quality and speed of rooting in the... -
The effect of the colonisation extent of arbuscular mycorrhizal fungi on the growth of pot grown Pterocarpus angolensis seedlings
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: S.N. Hengar --- Department of Forest Science, USA A.J. Valentine --- Department of Environmental Science, USA J.M. Theron --- Department of Forest Science, USAThe effect of the level of arbuscular mycorrhizal fungi (AMF) colonisation on the growth of Pterocarpus angolensis was studied. Mycorrhizal infected seedlings, showing either good or poor growth, under the same environmental conditions (temperature, humidity, light level) were analyzed for... -
Early growth and survival of Acacia galpinii after planting in a semi-arid environment in Zimbabwe
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: D. Mlambo --- National University of Science and Technology, Zimbabwe P. Nyathi --- National University of Science and Technology, Zimbabwe P. Milo --- National University of Science and Technology, ZimbabweAcacia galpinii grows naturally on the riverbanks and smaller drainage lines in semi-arid areas ofSouthern Africa. Trial planting of the species as a decorative tree commenced in 1993 along urban roads in Bulawayo, Zimbabwe. Early growth and survival of the... -
Comparison of procedures to evaluate the pathogenicity of Ceratocystisfimbriata sensu lato isolates from Eucalyptus in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: M van Wyk --- Department of Genetics, Tree Protection Co-operative Programme, Forestry and Agricultural Biotechnology Institute, South Africa RN Heath --- Department of Genetics, Tree Protection Co-operative Programme, Forestry and Agricultural Biotechnology Institute, South Africa M Tarigan --- Department of Microbiology and Plant Pathology, Tree Protection Co-operative Programme, Forestry and Agricultural Biotechnology Institute, South Africa M Vermeulen --- Department of Microbiology and Plant Pathology, Tree Protection Co-operative Programme, Forestry and Agricultural Biotechnology Institute, South Africa MJ Wingfield --- Department of Genetics, Tree Protection Co-operative Programme, Forestry and Agricultural Biotechnology Institute, South AfricaCeratocystis fimbriata sensu lato (s.l.) is an important pathogen of Eucalyptus. Pathogenicity of isolates has typically been evaluated by inoculating seedlings under greenhouse conditions. It is, however, not clear how accurately this reflects pathogenicity under field conditions. In this study,... -
The use of species–stem curves in sampling the development of the Zambian miombo woodland species in charcoal production and slash-and-burn regrowth stands
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: S Syampungani --- School of Natural Resources, Zambia CJ Geldenhuys --- Department of Forest and Wood Science, South Africa PW Chirwa --- Faculty of Natural and Agricultural Sciences, South AfricaThe use of fixed-area plot methods was considered unsuitable to compare the responses and recovery over time of different miombo woodland species to different land-use practices (i.e. charcoal production and slash-and-burn agriculture). Young regrowth stages have many stems and the... -
Insights from full-rotation Nelder spacing trials with Eucalyptus in São Paulo, Brazil
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: JL Stape --- Department of Forestry and Environmental Resources, USA D Binkley --- Natural Resource Ecology Laboratory, USAThe choice of spacing among trees for operational plantations is typically based on one or more experimental plantations that test for the response of tree and stand growth to a range of tree-to-tree distances. The most common design for spacing... -
Growth models for Pinus patula in Angola
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: C Delgado-Matas --- Faculty of Agrarian Sciences, Angola T Pukkala --- , FinlandThis study developed growth models for Pinus patula Schiede ex Schltdl. et Cham. for the Central Highlands of Angola for simulating the development of stand characteristics. The model set included dominant height, individual-tree diameter increment, individual-tree height and self-thinning models... -
A technique to identify annual growth rings in Eucalyptus grandis usingannual measurements of diameter at breast height and gamma raydensitometry
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: S Naidoo --- , South Africa F Ahmed --- , South Africa NW Pammenter --- , South Africa A Zboňák --- Department of Primary Industries and Fisheries, AustraliaMany eucalypt species do not show distinct growth rings because cambial activity does not show a strong response to seasonal variation in climate. Eucalyptus grandis, one of the most important commercial hardwood species in South Africa, is one such example... -
A stratification of the South African forestry landscape based on climatic parameters
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: JH Louw --- School of Natural Resource Management, South Africa I Germishuizen --- , South Africa CW Smith --- Paperbark Forestry Consulting, South AfricaThe benefits of high-resolution forest site classification systems have been widely acknowledged in South Africa as a prerequisite for decision-making in forestry management. Although substantial research and development work have been done on categorising and mapping the soil and geological... -
Critical water stress levels in Pinus patula seedlings and their relation to measures of seedling morphology
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: CA Rolando --- , New Zealand NW Pammenter --- , South Africa KM Little --- , South AfricaA pot trial was implemented to determine the effect of soil water stress following transplanting on shoot water potential and stomatal conductance of Pinus patula seedlings. The relationship of seedling morphology to measures of water stress was also investigated. The... -
Growth and yield models for Eucalyptus grandis grown in Swaziland
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: M du Plessis --- , South Africa H Kotze --- , South AfricaThe aim of this study was to develop a stand-level growth and yield model for short-rotation Eucalyptus grandis grown for pulp wood production at Piggs Peak in Swaziland. The data were derived from a Nelder 1a spacing trial established with... -
Vermicompost leachate improves seedling emergence and vigour of aged seeds of commercially grown Eucalyptus species
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: LS Kandari --- Research Centre for Plant Growth and Development, School of Biological and Conservation Sciences, South Africa MG Kulkarni --- Research Centre for Plant Growth and Development, School of Biological and Conservation Sciences, South Africa J van Staden --- Research Centre for Plant Growth and Development, School of Biological and Conservation Sciences, South AfricaVermicompost leachate (VCL) is a liquid generated by earthworms and microorganisms during the conversion of organic matter into vermicompost. Vermicompost leachate is rich in nutrients and believed to contain both known and unknown plant growth substances, which are beneficial to... -
Evaluation of flooding tolerance in cuttings of Populus clones used for forestation at the Paraná River Delta, Argentina
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: VMC Luquez --- , Argentina FG Achinelli --- , Argentina S Cortizo --- , ArgentinaWe analysed the responses to flooding of 14 poplar clones used for forestation at the Paraná River Delta, Argentina. Some are commercial clones planted in the area, and others belong to a poplar breeding program from the National Institute of... -
Development of site index curves for Pinus kesiya in the Philippines
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: RIC Lumbres --- Department of Forest Resources, Korea YJ Lee --- Department of Forest Resources, Korea YO Seo --- Department of Forest Resources, Korea FG Calora --- , PhilippinesThis study was conducted to develop a height–age growth model and site index curves for site quality evaluation of old secondary-growth stands of Pinus kesiya in the northern Philippines. The Chapman-Richards growth function was used in the guide curve method... -
Growth models based on radial increment observations for eight pine species in Angola
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Cristobal Delgado-Matas --- Faculty of Agrarian Sciences, Angola Timo Pukkala --- School of Forest Sciences, FinlandGrowth models for the Central Highlands of Angola were developed in this study for Pinus pseudostrobus Lindl., P. kesiya Royle ex Gordon, P. devoniana Lindl., P. chiapensis (Martinez) Andresen, P. elliottii Engelm., P. greggii Engelm. ex Parl., P. montezumae Lamb... -
Effects of irregular stand structure on tree growth, crown extension and branchiness of plantation-grown Pinus patula
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Simon A Ackerman --- Department of Forest and Wood Science, South Africa Pierre A Ackerman --- Department of Forest and Wood Science, South Africa Thomas Seifert --- Department of Forest and Wood Science, South AfricaThe practice of combining row and selective thinning in commercial pine plantation silviculture carries the risk of unwanted irregularities in tree distribution, a situation that is aggravated when tree selection during marking is poor. The potential consequences of poor tree... -
Paediatric antiretroviral treatment programmes in sub-Saharan Africa: a review of published clinical studies
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Mary-Ann Davies --- Infectious Diseases Epidemiology Unit, School of Public Health and Family Medicine, South Africa Matthias Egger --- , Switzerland Olivia Keiser --- , Switzerland Andrew Boulle --- Infectious Diseases Epidemiology Unit, School of Public Health and Family Medicine, South AfricaKnowledge of the experience and outcomes of current paediatric antiretroviral treatment (ART) programmes in sub-Saharan Africa can inform new programmes in the region as well as enhance existing ones. This is urgently needed to facilitate the scale-up of treatment, which... -
A chronic toxicity test protocol using Caridina nilotica (Decapoda: Atyidae) and the generation of salinity toxicity data
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AR Slaughter CG Palmer WJ MullerSalinization of freshwater resources is an increasing global problem, yet there is a paucity of chronic salinity tolerance data linked to very few chronic toxicity test protocols. This research aimed to generate a chronic toxicity test protocol and protective salinity... -
Effect of garlic, black seed and Biogen as immunostimulants on the growth and survival of Nile tilapia, Oreochromis niloticus (Teleostei: Cichlidae), and their response to artificial infection with Pseudomonas fluorescens
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AhmedS Diab SalahM Aly George John Yasser Abde-Hadi MohamedF MohammedThree dosage levels of black seed, garlic and commercial Biogen were administered for three months in summer and six months in winter to test their stimulation effect on growth, survival and response to challenge infection in Oreochromis niloticus. At the... -
Does reservoir trophic status influence the feeding and growth of the sharptooth catfish, Clarias gariepinus (Teleostei: Clariidae)?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: WM Potts T Hecht TG AndrewThe diet and growth of sharptooth catfish, Clarias gariepinus, in an oligotrophic system (Kat River Reservoir, Eastern Cape, South Africa) were compared to those in a eutrophic system (Laing Reservoir, Eastern Cape) to determine if the trophic status of a... -
Remediation of eutrophic water using Lemna minor in a controlled environment
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AA Ansari FA KhanThe growth response of common duckweed Lemna minor was studied at various temperature and pH levels for its possible application for remediating eutrophic waters. The dry weight, chlorophyll a, nitrogen, phosphorus, potassium, peroxidase (POD), catalase (CAT) and malondialdehyde (MDA) levels... -
Growth of market-size abalone (Haliotis midae) fed kelp (Ecklonia maxima) versus a low-protein commercial feed
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TL Francis GW Maneveldt J VenterThe growth of grow-out abalone fed on kelp, with c. 10 % dry weight protein content, was compared with that of those fed on 'Feed A' (a new low-protein commercial feed of c. 26 % protein), in a flow-through system... -
Population dynamics, life-history traits of and habitat use by two sympatric nothobranchiid fishes in a tropical stream, Kainji Lake Basin, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BD Olaosebikan SL Lamai T MusschootPopulation dynamics and life-history traits of two sympatric nothobranchiid killifishes, Epiplatys bifasciatus and E. spilargyreius, were studied for 24 months in an intermittent stream in the Kainji Lake Basin, Nigeria. Epiplatys bifasciatus was more abundant throughout the study period, but... -
Sexual dimorphism in two pure cichlid species, Oreochromis niloticus niloticus (Linnaeus 1758) and Sarotherodon melanotheron melanotheron Rüppel 1852, and their intergeneric hybrids
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Toguyéni B Fauconneau C Mélard A Fostier J Lazard E Baras ER Kühn S van der Geyten J-F BaroillerGrowth performances and sexual growth dimorphism were compared in two pure species of tilapia, Oreochromis niloticus niloticus (OO) and Sarotherodon melanotheron melanotheron (SS), and their reciprocal intergeneric hybrids (male O. n. niloticus × female S. m. melanotheron [OS] and male... -
Application of a direct toxicity assessment approach to assess the hazard of potential pesticide exposure at selected sites on the Crocodile and Magalies rivers, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TM Ansara-Ross --- Centre for Aquatic Research, Department of Zoology, South Africa V Wepener --- Centre for Aquatic Research, Department of Zoology, South Africa PJ van den Brink --- Department of Aquatic Ecology and Water Quality Management, The Netherlands MJ Ross --- Centre for Aquatic Research, Department of Zoology, South AfricaThe potentially hazardous effects of agricultural pesticide usage in the Crocodile (west) Marico catchment were evaluated using the Danio rerio and Daphnia pulex lethality, Selenastrum capricornutum growth inhibition and the Ames mutagenicity plate incorporation assays. Hazard assessment categories are proposed... -
Age estimation, growth rate and size at sexual maturity of tigerfish Hydrocynus vittatus from the Okavango Delta, Botswana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: R Gerber --- Centre for Aquatic Research, Department of Zoology, South Africa NJ Smit --- Centre for Aquatic Research, Department of Zoology, South Africa GM Pieterse --- Centre for Aquatic Research, Department of Zoology, South Africa D Durholtz --- , South AfricaThe aims of this study were to determine relative age, growth rate and size at maturity of tigerfish in the Okavango Delta as a basis for the development of a fisheries management plan. A total of 206 tigerfish Hydrocynus vittatus,... -
Life history of the steentjie Spondyliosoma emarginatum (Cuvier 1830) in Langebaan Lagoon, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Fairhurst CG Attwood MD Durholtz CL MoloneyMorphometric measurements and fin spine and ray counts, external colouration, macroscopic gonad stage and diet were recorded for steentjie Spondyliosoma emarginatum (Pisces: Sparidae) collected from Langebaan Lagoon between August 2004 and September 2005. Sagittal otoliths were removed, and age estimates... -
Population structure and growth of polydorid polychaetes that infest cultured abalone Haliotis midae
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CA Simon AJ BoothPolydorid polychaetes can infest cultured abalone thereby reducing productivity. In order to effectively control these pests, their reproductive biology must be understood. The population dynamics and reproduction of polydorids infesting abalone Haliotis midae from two farms in South Africa is... -
Using baseline biological and ecological information to design a Traffic Light Precautionary Management Framework for leerfish Lichia amia (Linnaeus 1758) in southern Angola
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WM Potts WHH Sauer A-R Childs ADC DuarteThe coastline of southern Angola is sparsely populated and, largely because of a protracted civil war, has very lightly exploited inshore fish stocks. This has provided the almost unprecedented opportunity to determine prefishing-state reference points and to implement management strategies... -
Growth of post-weaning abalone Haliotis midae fed commercially available formulated feeds supplemented with fresh wild seaweed
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TS Dlaza GW Maneveldt C ViljoenThe effect of five formulated feeds supplemented with fresh wild seaweed on the growth of post-weaning juvenile abalone Haliotis midae (6–20 mm shell length) was investigated by means of a growth trial at a commercial abalone farm over a period... -
Breeding success of African penguins Spheniscus demersus at Dassen Island, especially after oiling following the Apollo Sea spill
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AC Wolfaardt LG Underhill DC Nel AJ Williams J VisagieThe reproductive success of African penguins Spheniscus demersus at Dassen Island from 1994 to 2000 was variable, but much higher than previously reported figures for the species. Breeding success was positively related to the abundance of anchovy Engraulis encrasicolus and... -
Effects of herbivore grazing on the physiognomy of the coralline alga Spongites yendoi and on associated competitive interactions
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GW Maneveldt DW KeatsThe territorial gardening limpet Scutellastra cochlear occurs along the south and southern west coasts of South Africa, whereas one of its primary food items, the encrusting coralline alga Spongites yendoi, extends much farther north along the West Coast. A combined... -
Fermentative characteristics of Digitaria eriantha subsp. eriantha silage harvested at different stages of maturity
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: WA van Niekerk Abubeker Hassen FM BechazAn experiment was conducted to investigate the influence of stage of growth at harvest on fermentative characteristics of Digitaria eriantha subsp. eriantha silage. The treatment included three different growth stages (early vegetative, boot stage and full-bloom stage). The materials were... -
Inducible defences in Acacia sieberiana in response to giraffe browsing
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: AD Zinn D Ward K KirkmanAcacia trees comprise a principal component of the diet of many African browsers. The resultant browsing pressure has led to the evolution of both physical and chemical responses in Acacia trees. In an observational study, we investigated the physical and... -
Testing for a decline in secondary productivity under desertification in subtropical thicket, South Africa, using Angora goats: lessons for experimental design
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: TA Milne --- Centre for African Conservation Ecology, Department of Zoology, South Africa GIH Kerley --- Centre for African Conservation Ecology, Department of Zoology, South AfricaThere are few tests of the predicted decline of secondary productivity in desertified rangelands, despite this being one of the major concerns around desertification. Subtropical thicket, largely used for goat pastoralism, suffers extensive transformation typical of desertification. We measured body... -
A Combinatorial Approach for Analyzing the Number of Descendants in Increasing Trees and Related Parameters
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Markus Kuba Alois PanholzerThis work is devoted to a study of the number of descendants of node j in random increasing trees, previously treated in [5, 8, 10, 15], and also to a study of the number of descendants of node j in... -
Estimation of height growth patterns and site index curves for Pinus radiata plantations in New South Wales, Australia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: A HaywoodThe objective of this study was to estimate the mean top height growth patterns and site index curves (base index age 20 years) for Pinus radiata stands grown in New South Wales, Australia. Garcia's stochastic differential equation version of the... -
Comparative growth performance of different Australian provenances and local land races of Grevillea robusta at Lushoto and Ubiri in the West Usambara Mountains, Tanzania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: LM Madadi --- Lushoto Silviculture Research Centre, Tanzania SC Mathias --- Lushoto Silviculture Research Centre, Tanzania WA Mugasha --- , Tanzania L Nshubemuki --- , Tanzania ST Mwihomeke --- Department of Forestry, South AfricaGrowth of seven Grevillea robusta provenances from its natural habitat in northern New South Wales and southern Queensland, Australia, and five local land races were studied at two trial sites established in November 1998 at Lushoto and Ubiri in the... -
Modelling dimensional growth of three street tree species in the urban forest of the City of Tshwane, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: GH Stoffberg --- Department of Plant Science, South Africa MW van Rooyen --- Department of Plant Science, South Africa MJ van der Linde --- Department of Statistics, South Africa HT Groeneveld --- Department of Statistics, South AfricaTree height, crown height, crown diameter and stem diameter were measured for 282 trees of the indigenous species Combretum erythrophyllum, Searsia lancea and S. pendulina. Growth relationships were modelled using age as explanatory variable for stem diameter and subsequently stem... -
Clonal differences in log end splitting in Eucalyptus grandis in relation to age, parent performance, growth rate and wood density in two even-aged trials in Mpumalanga, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: FS MalanThis paper discusses the juvenile–mature correlation of log end splitting among Eucalyptus grandis clones from two trials and how differences in splitting relate to differences in wood density, pith-to-bark gradient and growth rate. Two approximately 20-year-old Eucalyptus grandis clonal trials... -
Nest position and type affect predation rates of artificial avian nests in the tropical lowland forest on Mount Cameroon
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Eric Djomo Nana --- Department of Ecology, Faculty of Science, Czech Republic Ondřej Sedláček --- Department of Ecology, Faculty of Science, Czech Republic Jana Vokurková --- Department of Ecology, Faculty of Science, Czech Republic David Hořák --- Department of Ecology, Faculty of Science, Czech RepublicNest predation is the leading cause of reproductive failure in birds and thus it shapes their life history strategies. Intensities of nest predation appear to differ among nest locations and types in both temperate and tropical regions. However, there is... -
Water temperature affects life-cycle duration of tadpoles of Natal cascade frog
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NA Rivers-Moore --- Centre for Water Resources Research, South Africa RJ Karssing --- Ezemvelo KZN Wildlife, South AfricaDirect and indirect effects of climate change on amphibians include range shifts and changes in community structure. The Natal cascade frog Hadromophryne natalensis has an altitudinal range of some 2 400 m in KwaZulu-Natal, and presents an opportunity to assess... -
Percentile-based Weibull diameter distribution model for Pinus kesiya stands in Benguet province, Philippines
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Roscinto Ian C Lumbres --- Warm Temperate and Subtropical Forest Research Center, Republic of Korea Young Jin Lee --- Department of Forest Resources, Republic of KoreaThis study was conducted to develop a diameter distribution model for Pinus kesiya stands in Benguet province, Philippines, using the percentile-based Weibull model. The performance of the different equations was examined using evaluation statistics such as the fit index (FI)... -
Double jeopardy: hypoglycaemia and advanced hepatocellular carcinoma
Item type: Journal Article • Journal: Journal of Endocrinology, Metabolism and Diabetes of South Africa • Authors: V Nicolaou --- Division of Endocrinology, Department of Medicine, R Shires --- Division of Endocrinology, KRL Huddle --- Department of Internal Medicine,Nonislet cell tumour-induced hypoglycaemia is an uncommon, but serious complication of malignancy. The aetiopathogenesis is largely as a result of tumoral overproduction of incompletely processed insulin-like growth factor-II. We describe the case of a 30-year-old black male patient who presented... -
When to be concerned about a conjunctival growth
Item type: Journal Article • Journal: South African Family Practice • Authors: MJ Labuschagne --- Clinical Simulation Unit,Because of various contributing factors such as exposure to ultraviolet (UV) light, especially UV type B radiation, and the high prevalence of human immunodeficiency virus (HIV) infection in South Africa, medical practitioners are often consulted by patients with conjunctival growths... -
Evaluation of kikuyu grass and moringa leaves as protein sources in Oreochromis mossambicus diets
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SN Hlophe --- Aquaculture Research Unit, School of Agricultural and Environmental Sciences, South Africa NAG Moyo --- Aquaculture Research Unit, School of Agricultural and Environmental Sciences, South AfricaThe ability to utilise leaf meal-based diets by Oreochromis mossambicus of 12.5 g (SD 1) was evaluated. Nine diets of 30% crude protein and 20 MJ gross energy kg–1 dry matter were formulated, comprising eight leaf-meal diets, where kikuyu leaf... -
Exploring personality preferences in relation to psychological career resources among managerial staff in the Western Cape fast food industry
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Melinde Coetzee --- Department of Industrial and Organisational Psychology, Dries Schreuder --- Department of Industrial and Organisational Psychology, Chris Kotze --- Department of Industrial and Organisational Psychology,The study explored the relationship between individuals' personality preferences (as measured by the Myers-Briggs Type Indicator, Form M) and their psychological career resources (as measured by the Psychological Career Resources Inventory) and whether the personality types differed significantly in terms... -
Breeding ecology of the Seychelles Black Parrot Coracopsis barklyi
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Anna Reuleaux --- Seychelles Islands Foundation, Seychelles Heather Richards --- Seychelles Islands Foundation, Seychelles Terence Payet --- Seychelles Islands Foundation, Seychelles Pascal Villard --- Seychelles Islands Foundation, Seychelles Matthias Waltert --- Department of Conservation Biology, Germany Nancy Bunbury --- Seychelles Islands Foundation, SeychellesKnowledge of breeding ecology is required for many conservation interventions. The Seychelles Black Parrot Coracopsis barklyi, endemic to the island of Praslin, is vulnerable to extinction. We aimed to improve understanding of C. barklyi breeding ecology to aid conservation planning... -
Studies on aspects of the biology of Tilapia mariae (Boulenger, 1899) (Osteichthyes Cichlidae) in Ethiope River, Niger Delta, Nigeria
Item type: Journal Article • Journal: African Zoology • Authors: Robert B. Ikomi --- Department of Zoology, Nigeria Happy O. Jessa --- Department of Zoology, NigeriaAspect of the biology of Tilapia mariae Boulenger, 1899, in Ethiope River were examined. T. mariae was captured in the river throughout the year and constituted about 31% of the cichlid catch. It attained a standard length of 17.5 cm;... -
Age and growth of the estuarine-dependent sparid Acanthopagrus berda in northern KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: N. C. James --- Oceanographic Research Institute, South Africa B. Q. Mann --- Oceanographic Research Institute, South Africa L. E. Beckley --- Oceanographic Research Institute, South Africa A. Govender --- Oceanographic Research Institute, South AfricaAges were estimated for the tropical sparid, Acanthopagrus berda, caught in northern KwaZulu-Natal estuaries. Whole otoliths were used in the age determination. Age estimates were validated by marginal increment analysis and oxytetracycline labelling, which indicated that opaque deposition occurs primarily... -
Bone growth patterns in two cordylid lizards, Cordylus cataphractus and Pseudocordylus capensis
Item type: Journal Article • Journal: African Zoology • Authors: Amanda J. Curtin --- Department of Zoology, South Africa P. le --- Department of Zoology, South Africa Fras N. Mouton --- Department of Zoology, South Africa Anusuya Chinsamy --- Department of Zoology, South AfricaCross-sections through the midshaft of the femora from an ontogenetic range of individuals were examined for Cordylus cataphractus, a heavily armoured, group-living lizard found in the western parts of South Africa, and Pseudocordylus capensis, an agile, montane lizard, occurring in... -
Preliminary examination of hatching season and growth of Engraulicypris sardella (Pisces: Cyprinidae) larvae and juveniles in Lake Malawi
Item type: Journal Article • Journal: African Zoology • Authors: Shinsuke Morioka --- Department of Aquaculture and Fisheries Science, Bunda College of Agriculture, Malawi Emmanuel Kaunda --- Department of Aquaculture and Fisheries Science, Bunda College of Agriculture, MalawiThe hatching period and the growth of Malawian cyprinid Engraulicypris sardella larvae and juveniles collected from two sites along the southwestern shoreline of Lake Malawi were investigated using otolith increment information. The lapillus was used to determine the age in... -
Age, growth and reproduction of largemouth bass, Micropterus salmoides, in Lake Manyame, Zimbabwe
Item type: Journal Article • Journal: African Zoology • Authors: C.A. Beamish --- Department of Ichthyology and Fisheries Science, South Africa A.J. Booth --- Department of Ichthyology and Fisheries Science, South Africa N. Deacon --- Department of Ichthyology and Fisheries Science, South AfricaA total of 478 largemouth bass, Micropterus salmoides (Lacépède, 1802), was sampled between September 1997 and July 2001 using hook-and-line in Lake Manyame, a water supply reservoir situated outside Harare, Zimbabwe. Male fish dominated the samples, possibly an effect of... -
Life history characteristics of Alticus monochrus, a supratidal blenny of the southern Indian Ocean
Item type: Journal Article • Journal: African Zoology • Authors: M. Bhikajee --- Faculty of Science, University of Mauritius, Mauritius J. M. Green --- Department of Biology, Canada R. Dunbrack --- Department of Biology, CanadaThe blenny Alticus monochrus Bleeker inhabits exposed rocky shores of Mauritius and other islands of the southwestern Indian Ocean. A. monochrus is an amphibious species and remains almost exclusively above the water line, migrating vertically with the tide while feeding... -
Ontogenetic dietary shift and morphological correlates for Diplodus capensis (Teleostei: Sparidae) in southern Angola
Item type: Journal Article • Journal: African Zoology • Authors: Timothy J. Richardson --- Department of Ichthyology and Fisheries Science, South Africa Warren M. Potts --- Department of Ichthyology and Fisheries Science, South Africa Carmen V. Santos --- Faculdade Ciências da Universidade Agostinho Neto (FCUAN), Angola Warwick H.H. Sauer --- Department of Ichthyology and Fisheries Science, South AfricaAllometric growth patterns of functional morphological variables that reflect resource use in fish were correlated with the diet of Diplodus capensis in southern Angola. A total of 114 individuals (76–336 mm FL) were collected for stomach content analysis and a... -
Life history strategy and population characteristics of an unexploited riverine cyprinid, Labeo capensis, in the largest impoundment in the Orange River Basin
Item type: Journal Article • Journal: African Zoology • Authors: Henning Winker --- Department of Ichthyology and Fisheries Science, South Africa Olaf L.F. Weyl --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa Anthony J. Booth --- Department of Ichthyology and Fisheries Science, South Africa Bruce R. Ellender --- Department of Ichthyology and Fisheries Science, South AfricaThe life history of an endemic riverine African cyprinid, Labeo capensis, that dominates the larger ichthyofauna in a large impoundment in the Orange River Basin four decades after damming, was investigated. Both sexes grew at a similar rate until the... -
Otoliths versus scales: evaluating the most suitable structure for ageing largemouth bass, Micropterus salmoides, in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: G.C. Taylor --- Department of Ichthyology and Fisheries Science, South Africa O.L.F. Weyl --- Centre for Invasion Biology, South African Institute for Aquatic Biodiversity, South AfricaThe suitability of scales for ageing Micropterus salmoides was determined by comparing the precision of growth zone counts on scales with those obtained from sectioned sagittal otoliths from a sample of 496 fish collected from Wriggleswade and Mankazana Impoundments in... -
In situ growth rate of Solen cylindraceus (Mollusca: Euheterodonta: Solenidae) in the St Lucia estuarine lake, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Holly A. Nel --- University of KwaZulu-Natal, Westville Campus, South Africa Renzo Perissinotto --- University of KwaZulu-Natal, Westville Campus, South Africa Ricky H. Taylor --- University of KwaZulu-Natal, Westville Campus, South AfricaSolen cylindraceus, an infaunal bivalve, can reach a maximum length of 95 mm. However, in the St Lucia estuarine system specimens are seldom larger than 55 mm. Thus, the primary aim of this study was to investigate the growth rate... -
Growth models for six Eucalyptus species in Angola
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Cristobal Delgado-Matas --- Faculty of Agrarian Sciences, Angola Timo Pukkala --- Faculty of Science and Forestry, FinlandThis study developed growth models for Eucalyptus saligna Sm., E. camaldulensis Dehnh., E. macarthurii H.Deane & Maiden, E. resinifera Sm., E. siderophloia Benth. and E. grandis Hill ex. Maiden, for the central highlands of Angola, and used these models to... -
Are historic growth patterns an indication of future growth patterns?
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: B W Steyn --- Department of Accountancy, W D Hamman --- Graduate School of Business, University of Stellenbosch,Over the last decade or two, much has been made of high and exceptionally high growth rates. In this paper, sales growth rates for industrial companies listed in South Africa are examined for the period 1974 to 2002. -
The relationship between conservatism in financial reporting and subsequent equity returns
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: W M Badenhorst --- Department of Accounting, Economics and Management Sciences,This study investigates whether or not long-term discretionary accounting conservatism has benefits for equity investors, as measured by long-term subsequent equity returns. Based on the long-term relationship between cash flows and earnings documented by Dechow (1994), this paper develops a... -
Prospects for the advancement of Women Chartered Accountants in Public Accounting firms in South Africa
Item type: Journal Article • Journal: De Ratione • Authors: E. Sadler --- University of South Africa,Female chartered accountants comprise a small minority of the accounting profession in South Africa, although dramatic increases in their numbers have occurred in recent years. The personnel partners of a selection of public accounting firms were surveyed about their employment... -
Sustainable growth and distributable earnings under inflation
Item type: Journal Article • Journal: De Ratione • Authors: J U de Villiers --- University of the Witwatersrand,This paper examines the effect of inflation on the relationship between a firm’s sustainable real growth rate and its dividend payout ratio. Ceteribus paribus, dividend payout ratios are found to decrease monotonically with increasing inflation. The extent of the decline... -
Sexual dimorphism based on body proportions and ontogenetic changes in the Brazilian electric ray Narcine brasiliensis (von Olfers, 1831) (Chondrichthyes: Narcinidae)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: FA Rolim --- Fisheries Institute of São Paulo, Brazil FP Caltabellotta --- Oceanography Department, Brazil MM Rotundo --- Zoological Collection of University of Santa Cecília – UNISANTA, Brazil T Vaske-Júnior --- Elasmobranch Laboratory, BrazilSexual dimorphism in the Brazilian electric ray Narcine brasiliensis from the south‑western Atlantic coast was evaluated based on body proportions and ontogenetic changes. All regions of the body were found to have differences in body proportions between the sexes, except... -
Doctors’ attitudes to and knowledge and usage of growth charts
Item type: Journal Article • Journal: South African Family Practice • Authors: Selma Smith --- Department of Family Medicine, South Africa Elizabeth Reji --- Department of Family Medicine, South AfricaBackground: Growth charts have been used worldwide for about 40 years but their use has always been fraught with problems. -
The impact of Ready-to-Use Supplementary Food (RUSF) in targeted supplementation of children with moderate acute malnutrition (MAM) in South Africa
Item type: Journal Article • Journal: South African Family Practice • Authors: Liana Steenkamp --- HIV & AIDS Research Unit, South Africa Ronette Lategan --- Department of Nutrition and Dietetics, Faculty of Health Sciences, South Africa Jacques Raubenheimer --- Department of Biostatistics, Faculty of Health Sciences, South AfricaObjective: To describe catch-up growth in children with moderate acute malnutrition (MAM) on targeted supplementation using Ready-to-Use Supplementary Food (RUSF). -
Comparison of Production Performance and Tolerance to Helminthosis of Toggenburg and Norwegian Crossbred Goats Under Smallholder Production Systems in Tanzania
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: S. W. Chenyambuga --- Department of Animal Science and Production, Tanzania D. S. Shija --- Department of Animal Science and Production, Tanzania L. J. M. Kusiluka --- The Nelson Mandela African Institute of Science and Technology, Tanzania F. P. Lekule --- Department of Animal Science and Production, TanzaniaThis study was carried out to compare the growth rate, lactation performance and tolerance to gastrointestinal nematode infection of Toggenburg and Norwegian breeds in Kongwa district, Tanzania with a semi-arid environment and Mvomero district with a sub-humid environment. Milk production... -
Modelling primary branch growth based on a multilevel nonlinear mixed‑effects model: a Pinus koraiensis plantation case study in north‑east China
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Lingbo Dong --- Department of Forest Management, College of Forestry, China Zhaogang Liu --- Department of Forest Management, College of Forestry, China Fengri Li --- Department of Forest Management, College of Forestry, China Lichun Jiang --- Department of Forest Management, College of Forestry, ChinaOn the basis of a multilevel nonlinear mixed‑effects model approach, branch diameter and length growth models were developed for a Pinus koraiensis plantation in north‑east China. The models developed were able to better capture the residual variation successfully by partitioning... -
Population increase and nest-site selection of Cattle Egrets Bubulcus ibis at a new colony in drylands of north-east Algeria
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Majda Sbiki --- Department of Natural and Life Sciences, Algeria Haroun Chenchouni --- Department of Natural and Life Sciences, Algeria Abdelkrim Si Bachir --- Department of Natural and Life Sciences, AlgeriaColony occupation by Cattle Egrets Bubulcus ibis at an arid location in north-east Algeria lasted from mid-March or April to August. The colony, which was founded in 2003, increased from 124 pairs in 2007 to 250 pairs in 2011 and... -
The effects of stock size and environmental variability on Cape hake recruitment in Namibia: an unsolved puzzle (a comment on Kainge et al. 2013)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J-P Roux --- Lüderitz Marine Research, Namibia MR Wilhelm --- Marine Science Institute, USAMeasuring and forecasting recruitment are central to the understanding and management of fish stocks. Kainge et al. (2013) studied the effect of spawning stock size and environmental fluctuations on the recruitment levels of the Cape hake Merluccius capensis in Namibia... -
Sexual size dimorphism in the lizard Oplurus cuvieri cuvieri (Squamata, Opluridae) from Madagascar
Item type: Journal Article • Journal: African Zoology • Authors: Herilala J.A.R Randriamahazo --- Department of Zoology, JapanSexual size dimorphism in the medium-sized lizard Oplurus cuvieri cuvieri, which is endemic to the dry deciduous forest of Madagascar, is presented. Adults are sexually dimorphic in body size, head size, and tail length. Males have a greater snout–vent length... -
Abundance and activity patterns of the Cape parrot (Poicephalus robustus) in two afromontane forests in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: J.O. Wirminghaus --- School of Botany & Zoology, University of Natal, South Africa Colleen T. Downs --- School of Botany & Zoology, University of Natal, South Africa M.R. Perrin --- School of Botany & Zoology, University of Natal, South Africa C.T. Symes --- School of Botany & Zoology, University of Natal, South AfricaBehaviour, movements and numbers of the rare Cape parrot (Poicephalus robustus) were investigated at two study sites to assess its conservation status and as the basis for an action plan for their conservation. Birds flew regularly to and from nearby... -
Pup growth and maternal attendance patterns in Subantarctic fur seals
Item type: Journal Article • Journal: African Zoology • Authors: S.P Kirkman --- Mammal Research Institute, Department of Zoology and Entomology, South Africa M.N. Bester --- Mammal Research Institute, Department of Zoology and Entomology, South Africa G.J.G. Hofmeyr --- Mammal Research Institute, Department of Zoology and Entomology, South Africa P.A. Pistorius --- Mammal Research Institute, Department of Zoology and Entomology, South Africa A.B. Makhado --- Mammal Research Institute, Department of Zoology and Entomology, South AfricaSamples of pups from the expanding populations of Subantarctic fur seals (Arctocephalus tropicalis) atMarion and Gough islands were weighed at specific ages between birth and weaning in the period 1993-2000. Growth was estimated and compared between years, sexes, sites of... -
Otolith features and growth of juvenile Opsaridium microcephalum (Pisces: Cyprinidae) from the southwestern shoreline of Lake Malawi
Item type: Journal Article • Journal: African Zoology • Authors: Shinsuke Morioka --- Department of Aquaculture and Fisheries Science, Bunda College of Agriculture, MalawiSanjika, Opsaridium microcephalum, were collected from two sites (Nkhotakota and Chia) along the southwestern shoreline of Lake Malawi. The sagitta of the otolith was arrowhead-shaped with an obvious nucleus. Increments in the sagittae were observable until the bases of the... -
The reproductive biology and postnatal development of the highveld mole-rat, Cryptomys hottentotus pretoriae(Rodentia: Bathyergidae)
Item type: Journal Article • Journal: African Zoology • Authors: G.P. Malherbe --- Department of Zoology and Entomology, South Africa N.C. Bennett --- Mammal Research Institute, University of Pretoria, South Africa A.S. Schoeman --- Department of Zoology and Entomology, South AfricaThe highveld mole rat, Cryptomys hottentotus pretoriae, occurs in the summer rainfall grasslands of northern South Africa. It is a colonial bathyergid in which reproduction is restricted to a single female. Courtship and copulation are initiated by the male mole... -
Xenopus laevis embryos and tadpoles as models for testing for pollution by zinc, copper, lead and cadmium
Item type: Journal Article • Journal: African Zoology • Authors: Lorren K. Haywood --- Ecophysiological Studies Research Group, School of Animal, South Africa Graham J. Alexander --- Ecophysiological Studies Research Group, School of Animal, South Africa Marcus J. Byrne --- Ecophysiological Studies Research Group, School of Animal, South Africa Ewa Cukrowska --- School of Chemistry, South AfricaThe toxicity of bio available Zn, Cu, Pb, and Cd on the life stages of Xenopus laevis embryos and tadpoles was investigated. Cu and Cd were found to affect the hatching success of the embryos, with a strong negative relationship... -
Growth of the Namaqualand speckled padloper, Homopus signatus signatus (Reptilia: Testudinidae)
Item type: Journal Article • Journal: African Zoology • Authors: Victor J.T. Loehr --- Homopus Research Foundation, NetherlandsGrowth was calculated for the world’s smallest tor toise species, Homopus signatus signatus, by compar ing body size data gathered in spring 2000, 2001 and 2002. Sexual differences could not be identified, but mean growth was significantly lower in 2000/01... -
Growth and longevity of Exosphaeroma hylocoetes (Isopoda) under varying conditions of salinity and temperature
Item type: Journal Article • Journal: African Zoology • Authors: T.O. Henninger --- Department of Zoology and Entomology, South Africa P.W. Froneman --- Department of Zoology and Entomology, South Africa A.J. Booth --- Department of Ichthyology and Fisheries Science, South Africa A.N. Hodgson --- Department of Zoology and Entomology, South AfricaThe effect of temperature (15 and 25°C) and salinity (15 and 35 practical salinity units) combinations on the growth and longevity of the South African estuarine isopod Exosphaeroma hylocoetes was investigated and data analysed using the logistic growth model. No... -
Optimisation of nitrogen and potassium for Aloe vera (L.) Burm.f. in a soilless culture system
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Jamal-Ali Olfati --- Horticultural Department, Iran Mohammad Saadatian --- Department of General Science, Faculty of Education, Iraq Eshaq Moqbeli --- Horticultural Department, IranAloe vera (L.) Burm.f. is highly appreciated due to its short growth period and high economic value among all Aloe species, and is used in pharmaceuticals, folk medicine, healthcare, cosmetic products and food products. Hydroponic systems have the potential to... -
Family variation in diameter growth and acoustic velocity in three 5‑year‑old South African‑grown Pinus elliottii×Pinus caribaea progeny trials established on three diverse sites
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Francois S Malan --- Research Division, South AfricaThis paper discusses family differences in the stiffness of young Pinus elliottii×P. caribaea wood and how these differences relate to differences in growth rate and altitude. Trees for measurement were obtained from three 5‑year‑old progeny trials established at three diverse... -
Influence of growth media and regulators on vegetative propagation of rosemary (Rosmarinus officinalis L.)
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: P. Kiuru --- Kenya Agricultural Research Institute (KARI) Thika, Kenya S. J. N. Muriuki --- Kenya Agricultural Research Institute (KARI) Thika, Kenya S. B. Wepukhulu --- Kenya Agricultural Research Institute (KARI) Thika, Kenya S. J. M. Muriuki --- Kenya Agricultural Research Institute (KARI) Thika, KenyaRosemary (Rosmarinus officinalis) is a woody, perennial herb with fragrant evergreen needle-like leaves and a lovely fragrance. Leaves are finely chopped and used to flavour dishes. Rosemary propagation is done through either seed or stem cutting. Seeds of rosemary are... -
Using synergistic exogenous phytohormones to enhance somatic embryogenesis from leaf explants of a Eucalyptus grandis clone
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Muhammad Nakhooda --- Department of Biotechnology and Consumer Sciences, South Africa Eshani Mandiri --- School of Life Sciences, South AfricaSomatic embryogenesis (SE) in Eucalyptus spp. has been limited to germinated seeds, flowers, lignotubers or zygotic embryos. The low yield of somatic embryos from leaf explants has hampered progress, even though leaves offer a more viable source of clonal explants... -
Lung function decline is accelerated in South Africans with cystic fibrosis
Item type: Journal Article • Journal: South African Family Practice • Authors: R Masekela --- Faculty of Health Sciences, Department of Paediatrics and Child Health, Division of Paediatric Pulmonology, Steve Biko Academic Hospital, South Africa S Olorunju --- Biostatistics Unit, South Africa RJ Green --- Faculty of Health Sciences, Department of Paediatrics and Child Health, Division of Paediatric Pulmonology, Steve Biko Academic Hospital, South Africa NT Magidimisa --- Faculty of Health Sciences, Department of Paediatrics and Child Health, Division of Paediatric Pulmonology, Steve Biko Academic Hospital, South AfricaBackground: Poor nutritional status has been shown to be associated with a significant decline in lung function in patients with cystic fibrosis. There are few data published on the lung function decline and the effects of nutritional status in cystic... -
Age and growth of Cape stumpnose Rhabdosargus holubi (Pisces: Sparidae) in the Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MW Farthing --- Department of Ichthyology and Fisheries Science, South Africa NC James --- South African Institute for Aquatic Biodiversity, South Africa WM Potts --- Department of Ichthyology and Fisheries Science, South AfricaRhabdosargus holubi is a small (maximum weight=2.4 kg) yet important fishery species in the estuaries of the south-east coast of South Africa. Little is known of its biology and specifically its growth rate, which is essential for sustainable management of the... -
Growth rate of speckled snapper Lutjanus rivulatus (Teleostei: Lutjanidae) based on tag-recapture data from the iSimangaliso Wetland Park, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BQ Mann --- Oceanographic Research Institute, South Africa B Lee --- Fisheries Department, Falkland Islands Government, Falkland Islands PD Cowley --- South African Institute for Aquatic Biodiversity, South AfricaThe growth rate of speckled snapper Lutjanus rivulatus was investigated using data from a long-term tag-recapture study conducted in the St Lucia Marine Reserve within the iSimangaliso Wetland Park, a World Heritage Site in northern KwaZulu-Natal, South Africa. A total... -
Vicarious trauma: The psychological impact of working with survivors of trauma for South African psychologists
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Xin-Cheng Sui --- Department of Psychology, South Africa Anita Padmanabhanunni --- Department of Psychology, South AfricaTraumatic events are highly prevalent in South African society and psychologists who work with survivors of trauma have been identified as particularly at risk of being adversely affected by their work, and experiencing vicarious trauma. This study aimed to explore... -
Are 20th-century recommendations for growth and height correct? A review
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Tt Samaras [AN0001]Findings supporting the counter-intuitive thesis that smaller body size promotes greater health and longevity are reviewed. In addition, the risks of promoting further growth through genetic manipulation are explored in relation to chronic disease and longevity. Supporting examples from animal... -
Growth of infants born to HIV-positive mothers fed a whey-adapted acidified starter formula with prebiotics and nucleotides
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Pa Cooper --- Department of Paediatrics, South Africa Kd Bolton --- Department of Paediatrics, South Africa M. Mokhachane --- Department of Paediatrics, South Africa Sc Velaphi --- Department of Paediatrics, South Africa Rm Mphahlele --- Department of Paediatrics, South Africa Hn Bomela --- Department of Paediatrics, South Africa L. Monaheng --- Department of Paediatrics, South Africa P. Roux --- School of Child and Adolescent Health, South Africa E. Haschke-Becher --- Central Laboratory, Department of Neurology, AustriaObjectives: The objectives of this study were to evaluate whether infants born to known HIV-positive mothers, but who were not themselves infected with HIV and who were fed a chemically acidified starter formula with prebiotics with or without nucleotides during... -
Nutrition in paediatric Crohn’s disease
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: O. Goulet --- Department of Pediatric Gastroenterology, Hepatology and Nutrition, FranceInflammatory bowel disease (IBD) such as Crohn’s disease (CD) results from the interaction between an individual’s immune response and precipitant environmental factors, which generate an anomalous chronic inflammatory response in those who are genetically predisposed. Protein-energy malnutrition (PEM) is a... -
The impact of preschool feeding programmes on the growth of disadvantaged young children in developing countries: a systematic review of randomised trials
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: A Els --- Department Nutrition and Dietetics, C Walsh --- Department Nutrition and Dietetics,Background: Childhood malnutrition in developing countries contributes to developmental delays, as well as increased morbidity and mortality. The effectiveness of feeding programmes as a strategy to improve childhood malnutrition has been questioned. -
Knowledge and perceptions of nursing staff on the new Road to Health Booklet growth charts in primary healthcare clinics in the Tygerberg subdistrict of the Cape Town metropole district
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: I Cloete --- False Bay Hospital, L. Daniels J Jordaan --- Gordonia Hospital, C Derbyshire L Volmink --- Wesfleur Hospital Division of Human Nutrition, Faculty of Medicine and Health Science, C Schubl --- Division of Human Nutrition,Objectives: The objectives of the study were to assess the perceptions of nursing staff on the Road to Health Booklet (RTHB), to assess their knowledge of the RTHB growth charts, and to determine whether the level of knowledge was acceptable... -
Knowledge in the economic growth of developing economies
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Manjinder Kaur --- Department of Economics, India Lakhwinder Singh --- Centre for Development Economics and Innovations Studies (CDEIS), IndiaIn the modern era, the success of a developing economy has become more dependent on the capacity to produce and use knowledge, which leads to the emergence of a knowledge economy. Keeping in view the significance of the knowledge economy... -
Evaluation of the effects of phosphorus and nitrogen source on aerial and subsoil parameters of maize (Zea mays L.) during early growth and development
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Pieter-Ernst Coetzee --- Department of Soil, Crop and Climate Sciences, South Africa Gert M Ceronio --- Department of Soil, Crop and Climate Sciences, South Africa Chris C du Preez --- Department of Soil, Crop and Climate Sciences, South AfricaUnderstanding the nutrient requirements of maize is especially important during early vegetative growth and development, particularly when produced on highly weathered soils with low organic matter contents. Therefore, the growth response of maize to different nitrogen (N) sources viz. limestone... -
Lifetable demography and population growth of the rotifer Brachionus angularis in Kenya: influence of temperature and food density
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: EO Ogello --- Graduate School of Fisheries and Environmental Sciences, Japan H-J Kim --- Graduate School of Fisheries and Environmental Sciences, Japan K Suga --- Graduate School of Fisheries and Environmental Sciences, Japan A Hagiwara --- Graduate School of Fisheries and Environmental Sciences, JapanLifetable demography and reproductive traits of a Kenyan strain of the rotifer Brachionus angularis were investigated using individual and small batch culture approaches. The rotifer was identified morphologically before conducting studies at 20, 25 and 30 °C, using Chlorella vulgaris... -
Modelling growth behaviour in monoculture in subtropical eastern Australia of two eucalypt species that differ in shade tolerance
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Philip W West --- Forest Research Centre, School of Environment, Science and Engineering, Australia Kevin Glencross --- Forest Research Centre, School of Environment, Science and Engineering, Australia J Doland Nichols --- Forest Research Centre, School of Environment, Science and Engineering, AustraliaGrowth behaviour of the relatively shade-intolerant species Eucalyptus dunnii and the rather more shade-tolerant Corymbia citriodora was considered during several growth periods over 8–14 years of age in experimental plantation monoculture in subtropical New South Wales. Larger trees dominated growth... -
Financial innovation and economic growth in the SADC
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Alex Bara --- Department of Economics, South Africa Gift Mugano --- Department of Economics, South Africa Pierre Le Roux --- Department of Economics, South AfricaThis study empirically establishes the causal relationship between financial innovation and economic growth in the SADC. Using an Autoregressive Distributed Lag (ARDL) Model, estimated by Pooled Mean Group and Dynamic Fixed Effects, the study finds that financial innovation generally has... -
Is the grazing tolerance of mesic decreaser and increaser grasses altered by soil nutrients and competition?
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Craig D Morris --- Agricultural Research Council – Animal Production Institute (ARC-API), South AfricaAn ability to tolerate recurrent defoliation likely plays a role in the compositional shift from decreaser to increaser species with overgrazing of mesic grassland, but the grazing tolerance of local species has not been extensively studied. The growth response of... -
Nutrient addition increases biomass of soil fungi: evidence from a South African grassland
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Zivanai Tsvuura --- School of Life Sciences, South Africa Meghan L Avolio --- National Socio-Environmental Synthesis Center, USA Kevin P Kirkman --- School of Life Sciences, South AfricaTheory predicts that nutrient addition to soil reduces the benefit of mycorrhizal associations to plants. This study sought to determine how long-term management of soil fertility influences the abundance of fungal mycelium. Ingrowth mesh bags were used to measure mycelial... -
Decision-support tool for management of miombo woodlands: a matrix model approach
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Wilson A Mugasha --- Department of Ecology and Natural Resource Management, Norway Ole M Bollandsås --- Department of Ecology and Natural Resource Management, Norway Terje Gobakken --- Department of Ecology and Natural Resource Management, Norway Eliakimu Zahabu --- Department of Forest Mensuration and Management, Tanzania Josiah Z Katani --- Department of Forest Mensuration and Management, Tanzania Tron Eid --- Department of Ecology and Natural Resource Management, NorwayRational forest management planning requires information on the present forest state and on future development. However, forest management planning in Tanzania has often been done without any information on forest development because appropriate tools are lacking. This study presents a... -
Public sector inefficiencies: Are we addressing the root causes?
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: David Fourie --- School of Public Management and Administration, Wayne Poggenpoel --- Faculty of Economic and Management Sciences, South AfricaPublic sectors all over the world face challenges and, thus far, public sector reforms have not been very successful. The public sector, as a key component of any economy, needs to address its challenges adequately to prevent economic growth and... -
Manufacturing sector productivity growth drivers: Evidence from SADC member states
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Douglas Chikabwi --- Faculty of Commerce, Department of Economics, Zimbabwe Clainos Chidoko --- Faculty of Commerce, Department of Economics, Zimbabwe Calvin Mudzingiri --- Department of Economics, South AfricaThis study investigates major drivers of manufacturing sector productivity growth of selected Southern African Development Community (SADC1) member countries. Using country-specific, fixed effects panel data modelled in a Cobb Douglas production function for the period 2000–2013, the study estimated manufacturing... -
Potential of producing green mealies in summer and winter at two sites in KwaZulu-Natal, South Africa, considering rainfall, soil moisture and weeding
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Dolapo B Akinnuoye-Adelabu --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Albert T Modi --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Tafadzwanashe Mabhaudhi --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South AfricaProducers are exploring possibilities of growing major crops outside the normal growing seasons due to environmental challenges associated with climate change. This study evaluated growth and yield of maize (Zea mays ‘SC701′) in relation to planting season and weeding. Field... -
Growth and phenology of a three- to four-year-old Sclerocarya birrea international provenance trial in Malawi
Item type: Journal Article • Journal: Southern Hemisphere Forestry Journal • Authors: PW Chirwa RJ Bwanali G Meke W Sagona CRY Munthali L MwabumbaIndigenous wild fruits of Sclerocarya birrea have been used to supplement diets in time of critical food shortage, generate income when sold and as a source of raw materials for natural food-based industries in many developing countries. However, the widespread... -
Growth and development of a six-year-old Uapaca kirkiana provenance trial at Nauko Forest Reserve, Malawi
Item type: Journal Article • Journal: Southern Hemisphere Forestry Journal • Authors: PW Chirwa RJ Bwanali W SagonaA research trial of seven provenances of Uapaca kirkiana (six obtained locally and one Mozambican) was established in 1997 at Nauko in Malawi in order to evaluate their performance. At six years of age, there were significant (p ≤ 0.05)... -
White-backed Vulture Gyps africanus parental care and chick growth rates assessed by camera traps and morphometric measurements
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Machawe I Maphalala --- School of Life Sciences, South Africa Ara Monadjem --- Department of Biological Sciences, SwazilandPersistent vulture declines across Africa are a cause for concern as the number of species threatened with extinction increases. The White-backed Vulture Gyps africanus was, until recently, considered abundant but has been declining rapidly in recent years due to various... -
Determination of optimum ethylmethanesulfonate conditions for chemical mutagenesis of selected vernonia (Centrapalus pauciflorus) accessions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sandile T Hadebe --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Albert T Modi --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Hussein A Shimelis --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South AfricaChemical mutagenesis could potentially increase allelic diversity and address genetic erosion in vernonia (Centrapalus pauciflorus) breeding programmes. The objective of this study was to determine an optimum treatment combination, i.e. exposure duration, temperature and ethylmethanesulfonate (EMS) dose that would reduce... -
Effects of waterlogging, salinity and light on the productivity of Bruguiera gymnorrhiza and Heritiera littoralis seedlings
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MM Mangora --- Institute of Marine Sciences, University of Dar es Salaam, Tanzania MSP Mtolera --- Institute of Marine Sciences, University of Dar es Salaam, Tanzania M Björk --- Department of Ecology, Environment and Plant Sciences, SwedenThis study aimed to establish the effects of waterlogging, salinity and light on the early development of mangroves. Seedlings of Bruguiera gymnorrhiza (L.) Lamk. and Heritiera littoralis Dryand were exposed to 12 weeks of waterlogging, during which time growth and... -
Population structure of the sicklefin lemon shark Negaprion acutidens within the Curieuse Marine National Park, Seychelles
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RD Hodgkiss --- Global Vision International Seychelles, Seychelles A Grant --- Global Vision International Seychelles, Seychelles JHR McClelland --- Global Vision International Seychelles, Seychelles R Quatre --- Seychelles National Parks Authority, Seychelles B Rademakers --- Global Vision International Seychelles, Seychelles C Sanchez --- Nature Seychelles, Seychelles C Mason-Parker --- Global Vision International Seychelles, SeychellesThis study produced the first data on population parameters for sicklefin lemon shark Negaprion acutidens at the granitic Seychelles Islands, adding to a limited catalogue of species information. Juveniles at a site in the Curieuse Marine National Park were tagged... -
Predicting site productivity of the timber tree Pterocarpus angolensis
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Vera De Cauwer --- Faculty of Natural Resources and Spatial Sciences, Namibia Esther Fichtler --- Tropical Plant Production and Agricultural Systems Modelling, Department of Crop Sciences, Germany Hans Beeckman --- Service of Wood Biology, Belgium F Patrick Graz --- Faculty of Natural Resources and Spatial Sciences, Namibia Jan Mertens --- Department of Applied Biosciences, Belgium Sam Van Holsbeeck --- Department of Applied Biosciences, Belgium Bart Muys --- Division of Forest, Nature and Landscape, BelgiumPterocarpus angolensis is an important timber tree of the miombo woodlands of sub-Saharan Africa. The species only grows in natural mixed forests and little is known about is productivity potential. This study aimed at investigating productivity of P. angolensis on... -
Reflections on becoming a psychologist: Professional development experiences of students in a South African psychology graduate program
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Jan J. Knoetze --- Psychology Department, South Africa Michelle McCulloch --- Psychology Department, South AfricaThis study sought to describe student psychologists’ experiences of their professional preparation activities in which they used reflective journals. The students (n =7; female = 71%, black = 86%) were enrolled in a masters training program in the clinical and... -
Gender-related morphometric differences in mature and nestling Crowned Eagles, with comments on ringing of eagle nestlings in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Shane C McPherson --- School of Life Sciences, South Africa Mark Brown --- School of Life Sciences, South Africa Colleen T Downs --- School of Life Sciences, South AfricaAlthough most raptor species are sexually dimorphic, many species are non-discrete in some metrics. A limited amount of existing data for southern Africa suggests that Crowned Eagles Stephanoaetus coronatus exhibit non-discrete sexual dimorphism. Consequently, we investigated gender-related morphometric data of... -
A Place for Individuals: Positive Growth in Rwanda
Item type: Journal Article • Journal: Eastern African Literary and Cultural Studies • Authors: Hannah Grayson --- School of Modern Languages, UKThis article introduces the Rwandan Stories of Change research project, and uses data collected jointly with the Aegis Trust to argue for the value of in-depth studies on individual Rwandans’ positive growth. It seeks to explore the place of individual... -
Age and growth of narrow-barred Spanish mackerel Scomberomorus commerson in the coastal waters of southern Mozambique and KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: B Lee --- Oceanographic Research Institute (ORI), South Africa BQ Mann --- Oceanographic Research Institute (ORI), South AfricaThe narrow-barred Spanish mackerel Scomberomorus commerson is one of the most important linefish species caught in KwaZulu-Natal and southern Mozambique waters, forming the basis of important commercial, artisanal and recreational fisheries. A total of 439 S. commerson were sampled along... -
Genotypic variation in tree growth and selected flavonoids in leaves of Cyclocarya paliurus
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Yanni Cao --- College of Forestry, China Bo Deng --- College of Forestry, China Shengzuo Fang --- College of Forestry, China Xulan Shang --- College of Forestry, China Xiangxiang Fu --- College of Forestry, China Wanxia Yang --- College of Forestry, ChinaCyclocarya paliurus is a valuable medicinal tree species in China. However, limited information is available on its genotype selection and cultivation for improvement of growth and health-promoting phytochemicals. To contribute to improved knowledge of the potential use of the species,... -
Exploratory factor analysis on drivers of firm’s growth among construction SMEs in Ghana
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: B. M. Arthur-Aidoo --- Sustainable Human Settlement and Construction Research Centre, Faculty of Engineering and the Built Environment, South Africa C. O. Aigbavboa --- Sustainable Human Settlement and Construction Research Centre, Faculty of Engineering and the Built Environment, South Africa W. D. Thwala --- Sustainable Human Settlement and Construction Research Centre, Faculty of Engineering and the Built Environment, South AfricaThe growth of construction SMEs is imperative if an economy is to develop. Numerous factors influence the growth of construction SMEs due to the nature of their operation. Their growth can also be driven their activities which can be classified... -
Weed density and biomass are reduced and plant growth and seed yield increased in common bean after solarisation with clear and black plastic
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Elizabeth Ngadze --- Department of Crop Science, Zimbabwe Arnold B Mashingaidze --- Department of Crop Science, Zimbabwe Julia Sibiya --- Department of Crop Science, ZimbabweCommon bean is highly sensitive to early weed competition, which severely reduces growth and yield. An experiment was carried out in Zimbabwe in the 2002/03 and 2003/04 seasons to assess the effectiveness of solarisation in controlling weeds in beans. Four... -
Association of micronutrients and child growth in children aged 7-15 years from Qwa-Qwa, South Africa
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Abdulkadir Egal --- Centre of Sustainable Livelihoods, South Africa Wilna Oldewage-Theron --- Centre of Sustainable Livelihoods, South AfricaObjectives: This study investigated the possible associations between micronutrient deficiencies and child growth in the rural community of Qwa-Qwa in the Free State province of South Africa (SA). -
Index selection for growth and construction wood properties in Pinus elliottii open-pollinated families in southern China
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Shuainan Zhang --- Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Zhejiang Provincial Key Laboratory of Tree Breeding, China Jingmin Jiang --- Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Zhejiang Provincial Key Laboratory of Tree Breeding, China Qifu Luan --- Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Zhejiang Provincial Key Laboratory of Tree Breeding, ChinaThe initial introduction of Pinus elliottii (PEE) to China occurred in the 1930s, and the planting of this conifer species has now attained close to 3 million ha in the subtropical zone of southern China. A large-scale genetic improvement program... -
The age and growth of hottentot seabream Pachymetopon blochii before and after the South African linefish state of emergency in 2000
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MW Farthing --- Department of Ichthyology and Fisheries Science, South Africa AC Winkler --- Department of Ichthyology and Fisheries Science, South Africa K Anderson --- Department of Ichthyology and Fisheries Science, South Africa S Kerwath --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa C Wilke --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa WM Potts --- Department of Ichthyology and Fisheries Science, South AfricaThe hottentot seabream Pachymetopon blochii is a small-sized (maximum 2.67 kg) sparid endemic to southern Africa. It is an important target in South Africa's Western Cape traditional linefishery, particularly in the absence of more valuable pelagic species (such as Thyrsites... -
Emotional intelligence and personal growth initiative effects on subjective happiness among university students
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Nuworza Kugbey --- Department of Family and Community Health, School of Public Health, Ghana Ethel Akpene Atefoe --- Department of Psychological Medicine and Mental Health, School of Medicine, Ghana Nkansah Anakwah --- Department of Criminal Law and Criminology, The Netherlands Kingsley Nyarko --- Department of Teacher Education, Ghana Samuel Atindanbila --- Department of Psychology, GhanaThis study examined emotional intelligence and personal growth initiative influences on the level of subjective happiness among university students in Ghana. Two hundred and sixty undergraduate students were participants (female = 69.8%; mean age = 21.72 years, SD = 3.61... -
Human development thresholds for inclusive mobile banking in developing countries
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Simplice A. Asongu --- Department of Economics, South Africa Nicholas M. Odhiambo --- Department of Economics, South AfricaThis study assesses human development thresholds at which mobile banking mitigates poverty and inequality in 93 developing countries for the year 2011. Mobile banking entails ‘mobile used to pay bills’ and ‘mobile used to receive/send money’, while the modifying policy... -
Response of two wheat cultivars to inoculation of diazotrophic bacteria in combination with reduced nitrogen fertilisation under field conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Reannah RN Otanga --- Discipline of Plant Pathology, School of Agriculture, Earth and Environmental Sciences, South Africa Kwasi S Yobo --- Discipline of Plant Pathology, School of Agriculture, Earth and Environmental Sciences, South Africa Mark D Laing --- Discipline of Plant Pathology, School of Agriculture, Earth and Environmental Sciences, South AfricaChemical fertilisers are essential for plant nutrition in attaining desired yields. However, increased cost of fertiliser input has made it impossible for small-scale farmers to properly fertilise their crops for optimum yields. Five bacterial strains originally isolated from no-till agricultural... -
Life-history traits of seabream Boops boops (Linnaeus, 1758) in the central eastern Atlantic Ocean (Canary Islands)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Massaro --- , Italy JG Pajuelo --- , SpainLife-history traits of the sparid Boops boops are studied for the first time in an isolated Atlantic population. Boops boops is a hermaphrodite species characterised by late gonochorism or non-functional hermaphroditism. The 1:0.852 ratio of females to males was significantly... -
Remediation of salt-affected soil by natural and chemical amendments to improve berseem clover yield and nutritive quality
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Zainab Mohamed Abd El-Naby --- Forage Research Department, Egypt Wafaa Abd El-Karim Hafez --- Soil, Water and Environment Research Institute, Agriculture Research Center, Egypt Hanan Ahmed Hashem --- Botany Department, Faculty of Science, EgyptSalinity is a major problem affecting crop production worldwide. The potential of different soil amendments (sulphur, gypsum, compost, and combination of gypsum, compost and sulphur) and two plant-growth stimulators (potassium silicate and calcium carbonate nanoparticles) to alleviate the harmful effects... -
Ovarian activity and plasma sex steroid levels of Distichodus antonii in relation to environmental conditions in the upper basin of the Congo River
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JS Osombause --- Research Unit in Environmental and Evolutionary Biology, Belgium SNM Mandiki --- Research Unit in Environmental and Evolutionary Biology, Belgium JA-P Ulyel --- Département d’Hydrobiologie, Congo J-C Micha --- Research Unit in Environmental and Evolutionary Biology, Belgium P Kestemont --- Research Unit in Environmental and Evolutionary Biology, BelgiumDistichodus antonii is an endemic fish species of the Congo River basin in which the stocks of wild populations are threatened by overfishing pressure. Knowledge of its reproductive biology would be useful in consideration of conservation and management options for... -
Use of Landsat multi-temporal imagery to assess secondary growth Miombo woodlands in Luanshya, Zambia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Reuben Lungu Lembani --- School of Geography, Archaeology and Environmental Studies, South Africa Jasper Knight --- School of Geography, Archaeology and Environmental Studies, South Africa Elhadi Adam --- School of Geography, Archaeology and Environmental Studies, South AfricaMiombo woodlands are the most extensive natural forest type in subtropical Africa, supporting the livelihood of over 100 million urban and rural settlers. These forests continue to experience extensive deforestation and land degradation due to land use land cover (LULC)... -
Personal growth initiative: Relation to Hedonia and Eudaimonia happiness among South African university students
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Henry D. Mason --- Directorate of Student Development and Support, South AfricaThis study examined the relationship between personal growth initiative (PGI) and hedonic and eudaimonic happiness among a sample of South African university students (N = 235; mean age = 20.38, SD = 1.55; female = 61.70%). Students completed measures on... -
Influence of site in the wood quality of Eucalyptus in plantations in Brazil
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Thiago Leite Barbosa --- Department of Forestry and Wood Sciences, Brazil José Tarcísio da Silva Oliveira --- Department of Forestry and Wood Sciences, Brazil Sofia Maria Gonçalves Rocha --- Department of Forestry and Wood Sciences, Brazil Ana Paula Câmara --- Department of Forestry and Wood Sciences, Brazil Graziela Baptista Vidaurre --- Department of Forestry and Wood Sciences, Brazil Antônio Marcos Rosado --- Celulose Nipo-Brasileira SA (CENIBRA), Brazil Fernando Palha Leite --- Celulose Nipo-Brasileira SA (CENIBRA), BrazilGenetic materials interact with the environment in specific ways, therefore their responses in wood need to be better understood. The present study sought to evaluate the influence of different climatic conditions in Minas Gerais, Brazil on Eucalyptus grandis × Eucalyptus... -
New age-determination method based on fast growth rate of Cape hake Merluccius capensis in Namibia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MR Wilhelm --- Department of Fisheries and Aquatic Science, Namibia SC Paulus --- National Marine Information and Research Centre (NatMIRC), Namibia S Kashava --- National Marine Information and Research Centre (NatMIRC), NamibiaNamibia’s most important commercial fisheries resource, the shallow-water Cape hake Merluccius capensis, is currently assessed using statistical catch-at-age analysis. Age data obtained from otoliths constitute an important data component of this model. Recent age-validation studies of M. capensis showed that... -
Spatial distribution, seasonal abundance and exploitation status of shark species in Kenyan coastal waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BK Kiilu --- Kenya Fisheries Services, Kenya B Kaunda-Arara --- Department of Fisheries and Aquatic Sciences, Kenya RM Oddenyo --- Coral Reef Conservation Project, Kenya P Thoya --- Kenya Marine and Fisheries Research Institute, Kenya JM Njiru --- Kenya Marine and Fisheries Research Institute, KenyaEfforts to conserve and manage shark populations are often hampered by a lack of basic data, such as species-specific landings and distribution ranges. We bridge this gap in coastal East Africa by providing data on the distributions, catch rates, morphometrics,... -
Growth and mortality parameters of the black-chinned tilapia Sarotherodon melanotheron melanotheron (Pisces: Cichlidae) in a small lagoon in the Central Region of Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GA Tibu --- Department of Fisheries and Aquatic Sciences, Ghana DW Aheto --- Department of Fisheries and Aquatic Sciences, Ghana J Blay --- Department of Fisheries and Aquatic Sciences, GhanaThis study quantified growth, mortality, and exploitation rate of the black-chinned tilapia (Sarotherodon melanotheron melanotheron) population in Etsir Lagoon, a small brackish waterbody at Abandze (5°11′ N, 1°5′ W) in the Central Region of Ghana for management of the stock... -
Growth and yield responses of two ginger species to different levels of nitrogen
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Auges Gatabazi --- Department of Plant and Soil Sciences, South Africa Diana Marais --- Department of Plant and Soil Sciences, South Africa J Martin Steyn --- Department of Plant and Soil Sciences, South Africa Hintsa T Araya --- Agricultural Research Council–Vegetable and Ornamental Plants, South Africa Salmina N Mokgehle --- Agricultural Research Council–Vegetable and Ornamental Plants, South AfricaNitrogen (N) is a critical determinant of plant growth and productivity, but there is limited information on the agronomic parameters of medicinal plants. Three levels of N fertiliser (0, 1.375 and 1.625 g plant−1) were used to investigate the effects... -
Integrating services for impact and sustainability: a proof-of-concept project in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: South African Family Practice • Authors: J Lyn Haskins --- Centre for Rural Health, South Africa Sifiso A Phakathi --- Centre for Rural Health, South Africa Merridy Grant --- Centre for Rural Health, South Africa Christiane M Horwood --- Centre for Rural Health, South AfricaBackground: Integration of services in primary health care settings can provide mother/baby pairs with all required services at one visit. This study aimed to evaluate a proof of concept, quality improvement (QI) intervention to strengthen well-child service provision and integration... -
Comparing feeding niche, growth characteristics and exploitation level of the giraffe catfish Auchenoglanis occidentalis (Valenciennes, 1775) in the two largest artificial lakes of northern Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SM Abobi --- Faculty of Biology (FB2), Germany JW Oyiadzo --- Department of Fisheries and Aquatic Resources Management, Ghana M Wolff --- Faculty of Biology (FB2), GermanyThe stomach contents of the giraffe catfish, Auchenoglanis occidentalis, populations from Lake Bontanga and Lake Tono, two artificial lakes, were analysed, together with length frequency data collected from July 2016 to June 2017, to gain knowledge of the stock bioecology... -
Goodwill impairment testing disclosures – South African compliance in 2018
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: Charles Day --- Oxford Brookes Business School, United KingdomThis paper reviews compliance with the IAS 36 goodwill impairment testing disclosure requirements by South African entities included in the All Share Index of the Johannesburg Stock Exchange. A detailed extraction of disclosures provided by entities with material levels of... -
Eutrophication of Ethiopian water bodies: a serious threat to water quality, biodiversity and public health
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: T Fetahi --- Aquatic Ecology, EthiopiaFreshwater ecosystems provide several ecological and economic services. However, these ecosystems in Ethiopia are deteriorating, because of economic growth, unwise use and pollution (eutrophication). This paper reviews existing trends of eutrophication in Ethiopian water bodies, identifies principal sources of nutrient... -
Validation of the periodicity of growth zone deposition in otoliths of two large endemic Labeobarbus species in Lake Tana, Ethiopia
Item type: Journal Article • Journal: African Zoology • Authors: Shewit Gebremedhin --- Department of Animal Science and Aquatic Ecology, Belgium Karen Bekaert --- Flanders Research Institute for Agriculture, Fisheries, and Food (ILVO), Belgium Abebe Getahun --- Department of Zoological Sciences, Ethiopia Stijn Bruneel --- Department of Animal Science and Aquatic Ecology, Belgium Wassie Anteneh --- Department of Biology, Ethiopia Els Torreele --- Flanders Research Institute for Agriculture, Fisheries, and Food (ILVO), Belgium Peter Goethals --- Department of Animal Science and Aquatic Ecology, BelgiumAlthough validation of the rate of growth zone deposition is a prerequisite for accurate age estimation, such studies are non-existent for the endemic Labeobarbus species in Lake Tana. Therefore, the aim of the current study was to validate the periodicity... -
Mechanisms of interference and exploitation competition in a guild of encrusting algae along a South African rocky shore
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Vanmari --- Department of Biodiversity and Conservation Biology, South Africa GW Maneveldt --- Department of Biodiversity and Conservation Biology, South AfricaWithin the marine benthos, space is considered an absolute requirement that is often in limited supply. The often-low availability of this essential resource causes species to interact competitively through mechanisms of interference and exploitation. Species of encrusting algae, in particular,... -
Interactive effect of planting date and fertiliser application on maize growth and yield under dryland conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Dolapo B Akinnuoye-Adelabu --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Tafadzwanashe Mabhaudhi --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Albert T Modi --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South AfricaUnderstanding the relationships among management practices during planting period will help producers to improve crop production under climate change. The interaction of planting date and soil fertility on maize yield was evaluated. Field trials were conducted during summer in 2014/15... -
Economic growth and R&D expenditures in selected OECD countries: Is there any convergence?
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Deepika Chawla --- Department of Economics, Patiala, IndiaThe economic growth of nations is strongly associated with rising R&D expenditures. The present study therefore endeavours to examine the stylized patterns of evolution of R&D expenditures (R&D expenditures as a share of GDP) along the development course in 18... -
Real options and asymmetric volatility in light of the firm’s growth opportunities
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Sagi Akron --- , Israel Ender Demir --- , Turkey Roi D. Taussig --- , IsraelThis study proposes a real options exercise mechanism as a novel explanation for the asymmetric volatility phenomenon. We suggest that asymmetric volatility stems from the exercise of real call options following positive shocks and the exercise of real put options... -
Conceptual decision-making framework for the sustainable harvesting of forest and woodland species for medicinal tree bark in southern Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: WJ Vermeulen --- , South Africa CJ Geldenhuys --- , South Africa KJ Esler --- , South Africa S Syampungani --- , Zambia G Meke --- , MalawiTree bark is widely used in traditional medicine in southern Africa. The growing demand for medicinal bark requires scientifically sound harvest systems for sustainable use. A conceptual framework and decision matrix are presented to aid forest managers in selecting the... -
Age and growth of Nile tilapia Oreochromis niloticus (Linnaeus, 1758) from Lake Tana, Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Degsera --- , Ethiopia M Minwyelet --- , Ethiopia T Yosef --- , EthiopiaAge and growth of Nile tilapia, Oreochromis niloticus, from Lake Tana were studied from June 2016 to May 2017. In total, 1 597 otoliths were collected from three representative sampling sites for macrozone analysis. Otoliths were ground and examined under... -
Potential impact of marine heatwaves on selected phytoplankton adapted to the Gulf of Guinea during stable hydrographic periods
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: E Acheampong --- , Ghana P Mantey --- , Ghana A Weremfo --- , GhanaReports suggest that the Gulf of Guinea (northeastern tropical Atlantic) frequently experiences marine heatwaves (MHW)—prolonged periods of anomalously warm seawater—of ≥1.5 °C above baseline. We assessed the likely impact of this anomaly on two microalgae, Thalassiosira weissflogii (diatom) and Gymnodinium... -
Analysing species site-specific tree growth, mortality and in-growth for miombo woodlands in Tanzania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: E E Njoghomi --- , Tanzania S Valkonen --- , K Karlsson --- ,The silvicultural information base for the development of management regimes for Tanzanian miombo woodlands is underdeveloped. The limited and fragmented information on tree growth and stand dynamics has constrained the progress of sustainable management in these woodlands. Therefore, this study... -
Does economic policy uncertainty aggravate financial constraints?
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: Lewis Makosa --- , China Sun Jie --- , China Wellington Garikai Bonga --- , Zimbabwe Moses Jachi --- , Zimbabwe Lovemore Sitsha --- , ZimbabweThis paper examines the impact of economic policy uncertainty on economic growth due to its effects on firms' investment decisions, which subsequently justify firms' financial constraints. Using a sample of Chinese listed firms, the study documents that economic policy uncertainty... -
Analysis of main factors affecting silage fermentation of sorghum prepared with whole crop and stover in semiarid West Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Yimin Cai --- , Japan Zhumei Du --- , China Delma B Jethro --- , Burkina Faso Man Nignan --- , Burkina Faso Seishi Yamasaki --- , JapanSorghum (Sorghum bicolor L.) is widely cultivated in semiarid West Africa as a combined crop for human consumption and animal feed. In order to address the shortage of ruminant feed in Burkina Faso, we studied the potential of preparing silage... -
Analysis of farmers’ food price volatility and Nigeria’s growth enhancement support scheme
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Joseph I. Uduji --- , Nigeria Elda Nduka Okolo-Obasi --- , Nigeria Simplice Anutechia Asongu --- , CameroonFood prices in Nigeria have become significantly higher and more volatile since 2012. The purpose of this research was to find out what affects farmers’ participation in the growth enhancement support scheme (GESS) in the country. We determined the effect... -
Structure, growth and growing space efficiency of Pinus radiata (D. Don) trees as affected by their social position
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Hans Pretzsch --- , Germany Andreas Rais --- , Germany Deon Malherbe --- , South Africa Antonio Ruano --- , Spain Hugo Lambrechts --- , The Netherlands Enno Uhl --- , Germany Ben du Toit --- , South AfricaCurrently, silvicultural prescriptions such as thinning monospecific stands from above and transitioning from monospecific to mixed-species stands are scrutinised regarding their ability to reduce stress and damage. That the quantity and quality of the trees harvested by intermediate and final... -
Public investment and economic growth in ECOWAS countries: Does governance Matter?
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Mamadou Bah --- , Côte d’Ivoire Koffi Kpognon --- , CameroonThe ECOWAS countries have been facing weak economic performance in recent decades. While the role of investment as an engine of growth is undeniable, the effect of public investment remains less clear. The role of the quality of governance in... -
The role of research and development (R&D) expenditure and governance on economic growth in selected African countries
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Ibukun James Olaoye --- , Nigeria Opeyemi Eyitayo Ayinde --- , Nigeria Oluwafemi Olajide Ajewole --- , Nigeria Luke Oloruntoba Adebisi --- , NigeriaThis paper provides an overview of the effect of research and development (R&D) expenditure and government effectiveness on economic growth. By focusing on R&D expenditure as a measure of innovation, government effectiveness as a measure of governance and GDP as... -
Population parameters, exploitation rate and diet of black-chinned Tilapia, Sarotherodon melanotheron Rüppell, 1852 (Pisces: Cichlidae), from Badagry Creek, Lagos, Nigeria
Item type: Journal Article • Journal: African Zoology • Authors: Prince Emeka Ndimele --- , Nigeria Fatai Gbolahan Owodeinde --- , Nigeria Edwin Oritseweyinmi Clarke --- , Nigeria Olufemi Olusegun Whenu --- , Nigeria Olufemi Olabode Joseph --- , NigeriaThe black-chinned tilapia (Sarotherodon melanotheron) is a member of the cichlid family, which can be cultured to complement the output from a predominantly catfish aquaculture industry in Nigeria. In order to achieve this objective, it is important to study the... -
Assessing the finance led growth hypothesis: Empirical evidence from sub-Saharan Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Kore Marc Guei --- , South Africa Ireen Choga --- , South AfricaFinancial development and economic growth nexus is still an ongoing debate. Several studies have indicated the positive benefits associated with enhancing financial development. Nevertheless, more work can still be done to reap the full benefits of financial development. With growing... -
Optimisation of micropropagation protocols for temperate eucalypt hybrids in South Africa, with a focus on auxin transport proteins
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Rafael Keret --- , South Africa Muhammad Nakhooda --- , South Africa Nicoletta B Jones --- , South Africa Paul N Hills --- , South AfricaGlobally the demand for forestry resources is booming, and consequently innovative approaches to cultivate valuable hardwoods, such as eucalypts, are crucial. Although micropropagation offers a means to clonally propagate desirable cultivars, this technique is often variety-specific for eucalypts. Thus, recalcitrant... -
Self-control mediation on the relationship between personal growth initiative and smartphone addiction among Chinese university students
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Yongguang Chen --- , China Yungui Guo --- , ChinaWe examined the role of self-control in the relationship between personal growth initiative and smartphone addiction among university students. A convenience sample of 783 Chinese students (female = 75.7%; mean age = 20.34 years, SD = 1.44 years) completed measures... -
Age and growth of the Cape knifejaw Oplegnathus conwayi, an endemic South African teleost
Item type: Journal Article • Journal: African Zoology • Authors: RM Foster --- , South Africa A-R Childs --- , South Africa BQ Mann --- , South Africa WM Potts --- , South AfricaThe South African spearfishery targets a variety of data-deficient species, which are consequently poorly managed. This study aimed to describe the age and growth of one of these species, the Cape knifejaw, Oplegnathus conwayi, which is endemic to the southern... -
The role of innovation for employment growth among firms in developing countries: Evidence from Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Stephen Kehinde Medase --- , South Africa Michael Wyrwich --- , The NetherlandsThis paper examines the nexus between innovation and employment growth. In contrast to most studies that employ data from technologically advanced economies, the study uses well-documented data from a leapfrogging and catching-up economy in sub-Saharan Africa. We find a positive... -
Influence of water application levels and plant densities on the plasticity of canola in the central Free State, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: KA Seetseng --- , South Africa LD van Rensburg --- , South Africa JH Barnard --- , South Africa CC du Preez --- , South AfricaIn South Africa canola (Brassica napus L.) is cultivated in rotation with wheat under winter rainfall in the Western Cape Province. Expansion of the crop to the other eight provinces is advocated to reduce a shortage of locally produced plant... -
Is application of commercial potassium humates beneficial to soil and wheat?
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: GM Ceronio --- , South Africa JT van Tonder --- , South Africa CC du Preez --- , South AfricaCommercial humates manufactured from oxidised lignites are often recommended to improve soil condition and crop growth. The benefits ascribed to these products are questioned, since they differ from humates that exist naturally in soils. Growth chamber, glasshouse and field experiments... -
Indicators of firm growth: Evidence from the JSE
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: Kyle Kildaire --- University of the Witwatersrand, South Africa Avani Sebastian --- University of the Witwatersrand, South Africa Warren Maroun --- University of the Witwatersrand, South AfricaThe estimation of firm growth is increasingly relevant to providers of capital in periods of economic uncertainty. The current study employs univariate and multivariate analyses to assess the impact of real GDP and the dividend payout ratio on earnings growth... -
The triple whorl for industrial parks entrepreneurial ecosystem development: Unleashing the integrated role on small ventures growth
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Abdella Kosa Chebo --- Kotebe Metropolitan University, Ethiopia Tesfaye Hailu Gebrekidan --- Kotebe Metropolitan University, EthiopiaDeveloping countries need industrial parks (IPs) to modernize their industries and technologies as well as to enable the growth of ventures by combining the entrepreneurial elements in the entrepreneurial ecosystem. Industrial parks will integrate domestic and foreign investment through public-private... -
An assessment of the medium-term reproductive success of an extralimital white rhinoceros population
Item type: Journal Article • Journal: African Zoology • Authors: Anja Truter --- , South Africa Nokubonga Mgqatsa --- , South Africa Daniel M Parker --- , South AfricaThe white rhinoceros (Ceratotherium simum) is threatened primarily due to continued poaching for its horns. In South Africa, partly to promote the conservation of the species, white rhinos have been introduced into areas where they did not occur historically (i.e... -
Fiscal policy and private investment in developing economies: Evidence from Ethiopia
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Fekadu Mekonnen Bedhiye --- Punjabi University, India Lakhwinder Singh --- Department of Economics and School of Commerce and Management, Khalsa College, IndiaPrivate investment is one of the major channels through which fiscal policy affects economic growth of a country. Endogenous growth theory for instance recognizes the effect of fiscal policy on economic growth through its impact on private investment although the... -
The impact of technological progress and digitization on Ghana’s economy
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Alex Boakye --- Institute for Social Development, South Africa Nnenna Nwabufo --- East Africa Regional Development and Business Delivery Office, African Development Bank, Kenya Mulugeta Dinbabo --- Institute for Social Development (ISD), South AfricaThis study analyzed the impact of technological progress and digitization on Ghana’s economy using panel data for the period 2009–2019. Technological progress and economic growth inter-dependency was analyzed in two steps. First, the relation was tested using Augmented Dickey–Fuller method... -
Relationships between spacing, productivity and profitability of eucalypt plantations in a small rural property in south-eastern Brazil
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Gabriel Soares Lopes Gomes --- Universidade Federal do Espírito Santo, Brazil Sílvio Nolasco de Oliveira Neto --- Universidade Federal de Viçosa, Brazil Helio Garcia Leite --- Universidade Federal de Viçosa, Brazil Márcio Lopes da Silva --- Universidade Federal de Viçosa, Brazil Lucas Sérgio de Sousa Lopes --- Universidade Federal de Viçosa, Brazil Bruno Leão Said Schettini --- Universidade Federal de Viçosa, BrazilTree cultivation spacing can influence productivity and wood quality, with silvicultural, technological and economic implications. This study aimed to estimate the production and provide an economic analysis of Eucalyptus urophylla × Eucalyptus grandis stands as a function of planting spacing... -
Factors affecting eucalypt survival in South African plantation forestry
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Ullrich Hechter --- Nelson Mandela University, South Africa Keith Little --- Nelson Mandela University, South Africa Julian Chan --- Institute for Commercial Forestry Research, South Africa Jacob Crous --- , South Africa Dean da Costa --- , South AfricaA review was conducted to highlight the most important factors contributing to increased mortality and decreased growth in eucalypt plantations during re-establishment (0–12 months). Citations were ranked in terms of credibility, with the importance ratings (derived from the literature sources)... -
Enhancing predictive precision of dominant height projection equations for eucalypts by incorporating rainfall and temperature terms
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Brian G Mandigora --- Stellenbosch University, South Africa David M Drew --- Stellenbosch University, South AfricaShort-rotation forest stands are sensitive to extreme climate conditions during their growth period, which presents a challenge to managing forests and modelling forest growth in a constantly changing climate. We developed climate-sensitive dominant height models for the Eucalyptus grandis ×... -
Effect of thinning on growth and allometry of Eucalyptus diversicolor
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Shes Kanta Bhandari --- The University of Western Australia, Australia Erik J Veneklaas --- The University of Western Australia, Australia Lachlan McCaw --- , Western Australia Richard Mazanec --- , Western Australia Michael Renton --- The University of Western Australia, AustraliaKarri (Eucalyptus diversicolor F. Muell.) forest is an endemic forest type of southwest Western Australia (SWWA), noted for having the tallest trees in the region, and providing commercial, ecological and conservation value. To inform management aimed at optimising these values,... -
Morphometrics, sexual dimorphism, and growth in the angonoka tortoise (Geochelone yniphora) of western Madagascar
Item type: Journal Article • Journal: The Journal of the Herpetological Association of Africa • Authors: LoraL. Smith --- University of Florida, USA Miguel Pedrono --- Université Pierre et Marie Curie, France RobertM. Dorazio --- U.S. Geological Survey, USA Jack Bishko --- University of Florida, USAThe most recent description of the morphology of the rare endemic Madagascar tortoise, Geochelone yniphora was based on fewer than 20 specimens. We collected morphological data for 200 free‐ranging tortoises from five populations over a four‐year period. Tortoises ranged in... -
Xenopus laevis embryos and tadpoles as biological indicators of acidic waters
Item type: Journal Article • Journal: The Journal of the Herpetological Association of Africa • Authors: LorrenK. Haywood --- University of the Witwatersrand, South AfricaXenopus laevis embryos and tadpoles show graded responses in terms of their hatching success, growth rate and incidence of malformations when exposed to acidity. These responses mean that they are good bioindicators of acidic waters. Exposure to a pH less... -
Age structure in the false tomato frog Dyscophus guineti from eastern Madagascar compared to the closely related D. antongilii (Anura, Microhylidae)
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Giulia Tessa --- Università degli Studi, Italy FabioM. Guarino --- Università di Napoli Federico II, Italy JasminE. Randrianirina --- Parc Botanique et Zoologique de Tsimbazaza, Faune, Madagascar Franco Andreone --- Museo Regionale di Scienze Naturali, Zoology, ItalyThe false tomato frog, Dyscophus guineti, is an endemic species of eastern Madagascar, typically found in open and swampy areas of mid-elevation forests. We measured 62 females and 70 males from a population from Marovato, next to Brickaville. Snout-vent length... -
Performance of goats browsing on Vachellia karroo encroached communal lands and open grasslands in the Eastern Cape province, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: W Maguraushe --- University of Fort Hare, South Africa JF Mupangwa --- University of Namibia, Namibia S Washaya --- Great Zimbabwe University, Masvingo V Muchenje --- University of Fort Hare, South AfricaThe objective of this study was to evaluate the effects of season, rangeland type, and herd size on the performance of goat browsing. A total of eighty communal household goat herds from Mbashe and Nkonkobe municipalities were monitored for twelve... -
Human capital accumulation and economic growth of Ethiopian economy
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Zemed Degu Mengesha --- Punjabi University, India Lakhwinder Singh --- Punjabi University, IndiaEconomic theory, empirical studies and public policy have underlined the importance of the relationship between human capital accumulation and economic growth. Several developing countries have included human capital development as an integral part of their national development plans and have... -
Movement patterns and growth rate of Scotsman Polysteganus praeorbitalis (Sparidae) tagged in the Pondoland Marine Protected Area, Eastern Cape, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: BQ Mann --- Oceanographic Research Institute, South Africa WN Dalton --- Oceanographic Research Institute, South Africa GL Jordaan --- Oceanographic Research Institute, South Africa R Daly --- Oceanographic Research Institute, South AfricaA tag-recapture study was undertaken on Polysteganus praeorbitalis in the Pondoland Marine Protected Area (PMPA) on the east coast of South Africa. A total of 1 042 fish were tagged over a period of 16 years and 255 individuals (24.5%)... -
A photo-identification-based assessment model of southern right whales Eubalaena australis surveyed in South African waters, with a focus on recent low counts of mothers with calves
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Brandão --- University of Cape Town, South Africa A Ross-Gillespie --- University of Cape Town, South Africa E Vermeulen --- University of Pretoria, South Africa DS Butterworth --- University of Cape Town, South AfricaPhoto-identification data for southern right whale cow–calf pairs on the South African calving grounds provide one of the longest abundance time-series for any whale population worldwide. Following a very steady increase from a heavily depleted state, surveys since 2015 reflect... -
Identity processing styles and personal growth initiative in college students: The mediating role of cultural tightness–looseness
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Precious Lucille Moakamela --- University of the Free State, South Africa Itumeleng P. Khumalo --- University of Johannesburg, South AfricaCultural norms and their regulation in society account for individual behaviour and related psychological processes. This study investigated if and how cultural norm regulation mediated the relationship between identity processing styles and intentional personal growth. A sample of 613 students... -
Intercropping forage cactus with sorghum affects the morphophysiology and phenology of forage cactus
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Alexandre Maniçoba da Rosa Ferraz Jardim --- Federal Rural University of Pernambuco, Brazil Luciana Sandra Bastos de Souza --- Federal Rural University of Pernambuco, Brazil Cleber Pereira Alves --- Federal Rural University of Pernambuco, Brazil Jandis Ferreira Nunes de Araújo --- Federal Rural University of Pernambuco, Brazil Carlos André Alves de Souza --- Federal Rural University of Pernambuco, Brazil Antonio Gebson Pinheiro --- Federal Rural University of Pernambuco, Brazil Gherman Garcia Leal de Araújo --- , Brazil Fleming Sena Campos --- Federal Rural University of Pernambuco, Brazil José Nildo Tabosa --- Agronomic Institute of Pernambuco, Brazil Thieres George Freire da Silva --- Federal Rural University of Pernambuco, BrazilThe aim of this study was to evaluate morphophysiological indices, phenology and cutting time of forage cactus (Opuntia and Nopalea spp.) clones intercropped with sorghum cultivars (Sorghum bicolor). The experiment was carried out from 2017 to 2018, in two cropping... -
Biological and life-history parameters for Labeo rosae Steindachner, 1894 and Oreochromis mossambicus (Peters, 1852) from Flag Boshielo Dam, Olifants River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: HA Hlungwani --- University of Limpopo, South Africa SM Marr --- University of Limpopo, South Africa OLF Weyl --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa JR Sara --- University of Limpopo, South AfricaInland fisheries contribute towards food security for rural communities living close to large aquatic systems. However, sustainable inland fisheries rely on accurate biological information for the target species at the proposed fishery location. In this study, the biological information for... -
Life-history traits in two invasive species of tilapias in Morocco
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: H Ainou --- Mohammed V University, Morocco J Panfili --- IRD, MARBEC (Institut français de recherche pour l'exploitation de la mer, Centre National de la Recherche Scientifique, Institut de Recherche pour le Développement), Université de Montpellier, France A Pariselle --- Mohammed V University, Morocco M Labonne --- IRD, MARBEC (Institut français de recherche pour l'exploitation de la mer, Centre National de la Recherche Scientifique, Institut de Recherche pour le Développement), Université de Montpellier, France H Louizi --- Mohammed V University, Morocco A Benhoussa --- Mohammed V University, Morocco O Berrada Rkhami --- Mohammed V University, Morocco JF Agnèse --- UMR ISEM (Institut de Recherche pour le Développement, Centre National de la Recherche Scientifique, Ecole Pratique de Hautes Etudes), Université de Montpellier, FranceLife-history traits (LHT) of Oreochromis niloticus in the Sidi Mohamed Ben Abdellah reservoir (BA reservoir) and Oreochromis aureus in the Nador Channel were studied and compared with those of other populations in the world. Specimens were collected between June 2018... -
The ecology of coastal wetland ponds created by diamond mining in southern Namibia. 3. Fish
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Maritz --- University of Cape Town, South Africa CG Attwood --- University of Cape Town, South Africa D Pillay --- University of Cape Town, South Africa GM Branch --- University of Cape Town, South AfricaDiamond mining in southern Namibia creates seawalls that hold the ocean at bay, yet seawater overwashes or seeps through to fill landward excavated areas, forming numerous coastal ponds that reach 380 000 m2. These ponds span ages of 1–40 years,... -
Movement patterns and underestimation of the maximum age of a Vulnerable endemic guitarfish species inferred from mark-recapture studies
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TS Murray --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa C Elston --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa RH Bennett --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa A-R Childs --- Rhodes University, South Africa PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaData collected from mark-recapture programmes have proven invaluable in assessing the movements and growth of numerous fishery species along the South African coastline. This short note reports on tag and recapture information on the Vulnerable endemic lesser guitarfish Acroteriobatus annulatus... -
Completeness of the road-to-health card and factors affecting knowledge and practices of growth monitoring and promotion in caregivers of young children in KwaZulu-Natal
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: T Mabesa --- University of KwaZulu-Natal, South Africa S Knight --- University of KwaZulu-Natal, South Africa N Nkwanyana --- University of KwaZulu-Natal, South Africa -
The morphophysiological mechanisms of light-induced net primary production of Amazonian tree species
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Victor Alexandre Hardt Ferreira dos Santos --- , Brazil Ana Flávia Monteiro de Souza --- Federal University of Amazonas, Brazil Bruna de Oliveira dos Santos --- Federal University of Amazonas, Brazil Adriana Grandis --- University of São Paulo, Brazil Marciel José Ferreira --- Federal University of Amazonas, BrazilWe investigated the morphophysiological mechanisms indicative of resource uses behind net primary production in seedlings of three valuable forest species of socio-economic value in the Amazon:mahogany (Swietenia macrophylla), Brazil nut (Bertholletia excelsa) and Laurel (Cordia alliodora). The hypotheses tested were:... -
Growth, vegetative rescue and vegetative propagation in Eucalyptus species and hybrids
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Patrícia Fukushima de Souza --- Universidade do Estado de Santa Catarina Centro de Ciências Agroveterinárias, Brazil Marcio Carlos Navroski --- Universidade do Estado de Santa Catarina Centro de Ciências Agroveterinárias, Brazil Mariane Oliveira Pereira --- Universidade do Estado de Santa Catarina Centro de Ciências Agroveterinárias, Brazil Marcos Felipe Nicoletti --- Universidade do Estado de Santa Catarina Centro de Ciências Agroveterinárias, Brazil Ramon Silveira de Andrade --- Universidade do Estado de Santa Catarina Centro de Ciências Agroveterinárias, BrazilThe objective of the study was the evaluation of survival and productivity indicators in different species/hybrids of Eucalyptus in the adult stage, as well as the vegetative rescue of adult trees and cuttings, testing for species/hybrids, concentration of growth regulator... -
Estimating the impact of digital technologies on government operations, business operations and general welfare: The case of South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Alex Boakye --- Institute for Social Development, South AfricaThe shift towards digitalization is fundamentally transforming societies and changing lives. Meanwhile, many African countries are lagging behind on the dividends of accelerated digital technologies to address their developmental challenges. This is partly because of the dearth of evidence demonstrating... -
An analysis of the micro- and macro-economic determinants of firm R&D intensity in the South African business sector
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Amy Kahn --- Human Sciences Research Council (HSRC), South Africa Atoko Kasongo --- Human Sciences Research Council (HSRC), South Africa Moses M. Sithole --- Human Sciences Research Council (HSRC), South Africa Kgabo Hector Ramoroka --- Human Sciences Research Council (HSRC), South AfricaResearch and experimental development (R&D) is an important driver of economic growth and productivity. Gross expenditure on domestic R&D (GERD) is a country’s total expenditure on R&D performed by all sectors of the economy. South Africa’s GERD as a percentage... -
Information and communication technology and poverty alleviation in Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Freeman Munisi Mateko --- University of Johannesburg, South AfricaThere is a disconnect between the abundant resources at the national level and the severe poverty at individual and household levels in Nigeria. Information and communication technology is an efficient tool that the Asian economies have used to alleviate poverty... -
Post-traumatic growth in Chinese parents of children with autism spectrum disorder: Statuses and personal factors
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Ming Hong --- , ChinaThis study aimed to characterise post-traumatic growth among parents of children with autism spectrum disorder (ASD) and the related factors. Participants were 396 parents of children with autism from Guangdong Province, China (female = 65.15 %; mean age = 33.67... -
Variation in survival, growth and stem straightness in Eucalyptus urophylla provenances in the Southern Highlands region of Tanzania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: MJ Sangiwa --- Sokoine University of Agriculture, Tanzania SAO Chamshama --- Sokoine University of Agriculture, Tanzania SMS Maliondo --- Sokoine University of Agriculture, Tanzania JN Mwambusi --- Sokoine University of Agriculture, Tanzania RP Mushumbusi --- Tanzania Forestry Research Institute, Tanzania SM Mputa --- Tanzania Forestry Research Institute, TanzaniaLack of quality planting materials has significantly limited productivity and quality of commercial forestry plantations in Tanzania. A provenance/progeny trial of Eucalyptus urophylla was established to test performance in order to select the best planting materials for future plantation activities... -
Growth and adaptability of provenances and progenies of Pinus maximinoi H.E.Moore in northern Mozambique
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Cremildo Riba Gouveia Dias --- Agricultural Research Institute of Mozambique, Mozambique Laurina Adriano Guacha --- Institute of Geography and Spatial Planning, University of Lisbon, Portugal Aires Afonso Mbanze --- Universidade Lúrio (Campus Universitário de Unango), MozambiqueThe aim of this study was to evaluate the growth and adaptability of Pinus maximinoi provenances and progenies and to estimate the genetic variation that could be exploited in feature improvement (e.g. breeding studies). Data from this study are from... -
Change in the prevalence of extra-uterine growth restriction in very low birthweight infants, following the introduction of a written nutrition protocol, in a tertiary neonatal unit
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: LND Mosidi --- University of Pretoria, A van Niekerk --- Steve Biko Academic Hospital, South Africa M Coetzee --- University of Pretoria, -
The impact of printing industry effluent on the growth and antioxidant response of the freshwater green microalga Chlorella sorokiniana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: IY Okpanachi --- Nigerian Army University Biu, Nigeria U Aminu --- Ahmadu Bello University, Nigeria AO Jolaoso --- University of Lagos, Nigeria WN Yusufu --- Ahmadu Bello University, Nigeria E Abdulmalik --- Ahmadu Bello University, Nigeria MA Chia --- Ahmadu Bello University, NigeriaContamination of aquatic ecosystems with printing industry wastewater is a serious concern because of the toxicity associated with the effluent components and a tendency to create cascading ecological effects. The influence of printing-press effluent on the freshwater microalga Chlorella sorokiniana... -
Innovation and economic growth: An empirical analysis for African countries
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Atoko Kasongo --- Human Sciences Research Council, Cape Town, South Africa, Tlangelani Makamu --- Human Sciences Research Council, Cape Town, South Africa,In recent decades, innovation has become recognized as a key driver of economic growth. This study investigated the relationship between innovation and economic growth in 32 African countries from 2006 to 2017. The linear regression panel corrected standard errors (PCSEs)... -
Tax buoyancy dynamics in sub-Saharan African nations: The case study of Rwanda
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Gaudence Uwimana --- University of Rwanda, Kigali Rwanda Charles Ruranga --- University of Rwanda, Kigali Rwanda Emmanuel Masabo --- University of Rwanda, Kigali Rwanda Mammo Muchie --- Tshwane University of Technology, South AfricaTax buoyancy exhibits unique behaviour in nations facing specific challenges. This phenomenon is particularly pronounced in sub-Saharan countries which often implement tax exemptions to boost investment and facilitate trade. This study investigates tax buoyancy in Rwanda. It uses government administrative... -
Wide variation in aggressiveness and growth in South African Fusarium circinatum isolates with geographical origin as the primary determinant
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: BS Swalarsk-Parry --- University of Pretoria, South Africa L De Vos --- University of Pretoria, South Africa FF Fru --- University of Pretoria, South Africa QC Santana --- University of Pretoria, South Africa MA van der Nest --- University of Pretoria, South Africa BD Wingfield --- University of Pretoria, South Africa MJ Wingfield --- University of Pretoria, South Africa DA Herron --- University of Pretoria, South Africa JB Ramaswe --- University of Pretoria, South Africa C Dewing --- University of Pretoria, South Africa M Sayari --- University of Pretoria, South Africa NA van der Merwe --- University of Pretoria, South Africa S van Wyk --- University of Pretoria, South Africa FA Lane --- University of Pretoria, South Africa AM Wilson --- University of Pretoria, South Africa OO Adegeye --- University of Pretoria, South Africa NC Soal --- University of Pretoria, South Africa J-L Price --- University of Pretoria, South Africa ET Steenkamp --- University of Pretoria, South AfricaFusarium circinatum is a globally important fungal pathogen that causes pitch canker on a wide range of Pinus species. In this study, we considered mycelial growth in culture and aggressiveness of a South African population of F. circinatum isolates. The... -
Life-history of invasive common carp, Cyprinus carpio, within a natural lake (Groenvlei), South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DL Mukhari --- Rhodes University, South Africa L Mofu --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa AT Lombard --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa CG Attwood --- University of Cape Town, South Africa M Witteveen --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa MKS Smith --- Rhodes University, South Africa PD Cowley --- Rhodes University, South Africa OLF Weyl --- Rhodes University, South Africa J Pegg --- Rhodes University, South AfricaCommon carp, Cyprinus carpio, is a global invasive species illegally introduced into the Groenvlei system, South Africa, in the 1990s for recreational angling. To manage this population effectively, basic information is needed on its biology including growth and reproduction. This... -
Multiple solutions for a Bibarmonic elliptic equation with critical Choquard type nonlinearity
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Chunyu Lei --- Guizhou Minzu University, China Jun Lei --- Guizhou University, China Hongmin Suo --- Guizhou Minzu University, ChinaThis article concerns the following Bibarmonic elliptic equation with critical growth -
The effect of superphosphate on the productivity of mucuna (Mucuna pruriens) on a sandy loam soil in Zimbabwe
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.D. Shoko --- Department of Agronomy, University of Stellenbosch, Private Bag X1, RSA P.J. Pieterse --- Department of Agronomy, University of Stellenbosch, Private Bag X1, RSA G.A. Agenbag --- Department of Agronomy, University of Stellenbosch, Private Bag X1, RSAPositive responses to increased soil phosphorus (P) supply have been noted for several leguminous species including mucuna (Mucuna pruriens). The major objective of this research was to investigate the effect of P level of 40 kg P ha-1 on the... -
Subjective well-being of college students: Developmental trajectories, predictors, and risk for depression
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Xinqiao Liu --- Tianjin University, China Yan Li --- Tianjin University, China Wenjuan Gao --- Institute of Higher Education, Beihang University, ChinaThe study aimed to identify different developmental trajectories of subjective well-being for 2 473 college students from freshman to senior year (female = 47.15%; mean age = 19.6 years, SD = 0.894 years). We further explored the associations between categories... -
Age and growth of the invasive bluegill Lepomis macrochirus (Rafinesque, 1810) from the Howison’s Poort Dam, Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PM Ndaleni --- South African Institute for Aquatic Biodiversity, South Africa L Mofu --- South African Institute for Aquatic Biodiversity, South AfricaThe present study assessed the age and growth of bluegill, Lepomis macrochirus (Rafinesque, 1810) from Howison’s Poort Dam, Eastern Cape. Precision between readers and structures (burnt and unburnt) of otoliths were estimated, and the aging error was determined by the... -
“Tell a good story of China”: Experiences of state-sponsored overseas Chinese academics navigating frictions and identity in South Africa
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Chen Tian --- , South AfricaThis study explores the experiences of state-sponsored overseas Chinese academics (OCAs) in South Africa and the frictions they encounter while adapting to a new professional environment. An in-depth analysis of China’s managed cultural globalisation, state-sponsored OCAs’ internal and international mobilities,... -
An empirical investigation into dynamics of growth of Indian economy impacted by public and private sector investment: Is there evidence of crowding out effect?
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Priya Gupta --- Jawaharlal Nehru University, India Pratibha Rai --- University of Delhi, India Vijeta Pundir --- University of Delhi, India Bhawna --- Jawaharlal Nehru University, IndiaThis study examines the dynamic effects of public and private investments on India’s economic growth, focusing on disaggregating public sector investments into infrastructure and non-infrastructure Gross Fixed Capital Formation (GFCF). Key questions include: How do public infrastructure and non-infrastructure investments... -
Integrating rainfall data into site-specific modelling to improve forest productivity estimation of eucalypt hybrid species in coastal Zululand, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Morries Chauke --- School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, South Africa Henry Mwambi --- School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, South Africa Antonio C Ferraz-Filho --- Federal University of Piauí, BrazilThis study aimed to develop a dynamic dominant height model and explore the effects of rainfall on the growth dynamics of Eucalyptus grandis × Eucalyptus urophylla. This species is grown for wood production in South Africa, and accurately estimating site... -
Role of subregional cooperation towards environmental conservation
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Robita Lee Robinson --- Universiti Malaya, Malaysia Angathevar Baskaran --- Universiti Malaya, Malaysia Sonia Kumari Selvarajan --- Universiti Malaya, MalaysiaThis study examines the role of subregional cooperation in advancing environmental conservation within the ASEAN framework, focusing specifically on the Indonesia-Malaysia-Thailand Growth Triangle (IMT-GT) and its institutional body, the Centre for IMT-GT Subregional Cooperation (CIMT). Through qualitative analysis based on... -
Case report: nutritional management of a repaired congenital diaphragmatic hernia
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: S Greyvenstein --- North-West University, South Africa RC Dolman-Macleod --- North-West University, South AfricaCongenital diaphragmatic hernia (CDH) is a rare diaphragm malformation that historically had low survival rates, but advances in care have improved outcomes. This case study discusses the outpatient management of an 8-month-old male infant who survived CDH but, due to... -
Umbilicity of complete linear Weingarten hypersurfaces immersed in certain Einstein manifolds
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Henrique F. de Lima --- Universidade Federal de Campina Grande, Brazil Lucas S. Rocha --- Universidade Federal de Campina Grande, Brazil Marco Antonio L. Velásquez --- Universidade Federal de Campina Grande, BrazilIn this paper, we present some sets of geometric conditions that ensure the umbilicity of linear Weingarten hypersurfaces immersed in an Einstein manifold satisfying standard curvature constraints which, in particular, are verified by a Riemannian space with constant sectional curvature... -
Can good ESG performance help companies resist external shocks?
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Xin Yang --- Nanfang College, China Ahmad Fahmi Sheikh Hassan --- Universiti Putra Malaysia, Malaysia Yusuf Karbhari --- Cardiff University, UKIn order to validate the varied conclusions regarding the integration of corporate ESG practices by investors during external shocks, this study utilises the COVID-19 crisis as a specific external shock. The findings from our difference-in-differences methodology suggest that companies demonstrating... -
Innovating financial metrics for SME development: A factor-based analysis of Chinese enterprises
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Jiaqi Wang --- Universiti Malaya, Malaysia Wee-Yeap Lau --- Universiti Malaya, Malaysia Angathevar Baskaran --- Universiti Malaya, MalaysiaThis study investigates the role of innovative financial performance metrics in promoting the sustainable development of small and medium-sized enterprises (SMEs) in China. Responding to the limitations of single-indicator financial assessments, the research develops a composite Financial Performance Evaluation (FPE)... -
Mobile FinTech and financial inclusion in sub-Saharan Africa: A comparative analysis
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Abdul Karim Kamara --- University of International Business and Economics, People’s Republic of China Emmanuel Owusu Oppong --- University of International Business and Economics, People’s Republic of ChinaThis paper examines the impact of mobile FinTech on financial inclusion in sub-Saharan Africa. The analysis used data from the Global Findex database in 2014, 2017, and 2021 and from the World Development Indicators database. For mobile FinTech, the study... -
Haemoglobin levels and growth of South African infants aged 6–12 months exposed to maternal HIV infection
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Phumudzo Tshiambara --- University of Pretoria, South Africa Marinel Hoffman --- University of Pretoria, South Africa Heather Legodi --- Sefako Makgatho Health Sciences University, South Africa Helen Mulol --- University of Pretoria, Kalafong Provincial Tertiary Hospital, South Africa Ute Feucht --- University of Pretoria, Kalafong Provincial Tertiary Hospital, South Africa -
The genetic control of early growth properties in Pinus patula × Pinus tecunumanii hybrid families
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: JP de Villiers --- Sappi Shaw Research Centre, South Africa A Nel --- Sappi Shaw Research Centre, South Africa B du Toit --- University of Stellenbosch, South AfricaThe objective of this study was to determine the genetic control of growth properties in Pinus patula × Pinus tecunumanii hybrid families across seven sites planted in the summer rainfall region of southern Africa. Genetic material included in the analyses... -
Digital advancement in the East African Community: The impact of information and communications technology on economic growth and energy consumption
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Abdikafi Hassan Abdi --- SIMAD University, Somalia Abdikarim Abdullahi Hersi --- SIMAD University, Somalia Abdiwahid Abdullahi Khalif --- SIMAD University, Somalia Mohamed Mire Mohamed --- SIMAD University, SomaliaAs the East African Community (EAC) modernizes and grows its digital infrastructure, it is essential to comprehend the influence of information and communications technology (ICT) on productivity and energy consumption to formulate initiatives that foster sustainable growth. Accordingly, this study... -
Life-history traits of the false jacopever Sebastes capensis (Scorpaenidae: Sebastinae) in South African waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Mohamed --- Department of Biological Sciences, University of Cape Town, South Africa CG Attwood --- Department of Biological Sciences, University of Cape Town, South AfricaThe genus Sebastes (rockfishes) of family Scorpaenidae (scorpionfishes) contains over 110 species, of which the false jacopever Sebastes capensis is the only one found in South African waters. Although it is a commonly caught linefish along the west coast of...