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Preparation of Moulding Resins from Inexpensive By-products: Substitution of Phenol Novolac with Unmodified Lignin in Moulding Resin and its Effect on Physical Properties of Mouldings
Item type: Journal Article • Journal: South African Forestry Journal • Authors: R.E. Ysbrandy --- Department of Wood Science, Republic of South Africa G. F.R. Gerischer --- Department of Wood Science, Republic of South Africa R.D. Sanderson --- , Republic of South AfricaMouldings of 25% resin content were prepared. Substitution of phenol novolac with various ratios of unmodified bagasse lignin was investigated. The effect of lignin incorporation on tensile and dimensional stability properties of mouldings was then studied. Low levels of lignin... -
Seasonal Fluctuations and Diversity of Bark and Wood-boring Beetles in Lowland Forest: Implications for management Practices
Item type: Journal Article • Journal: South African Forestry Journal • Authors: S.S. Madoffe --- Department of Forest Biology, A. Bakke --- , Ås; NorwayThe phenology and diversity of wood-living beetles attacking Cedrela mexicana, Khaya nyasica and Milicia excelsa were observed for one year with weekly window-flight-trap collections. A total of 150 species (10 known to be common pests of timber) were collected, most... -
Laboratory Technique for the Development and Evaluation of Moulded Resinous Composites
Item type: Journal Article • Journal: South African Forestry Journal • Authors: R.E. Ysbrandy --- Dept. of Wood Science, G. F.R. Gerischer --- Dept. of Wood Science, R.D. Sanderson --- , Republic of South AfricaTwo procedures of resin moulding powder preparation were evaluated. Their results are discussed on the basis of their tensile properties for moulded dumb-bells. The best procedure was then implemented for future work on phenolated pitch/ligin systems. Mouldings of different resin... -
Preparation of Binders from Inexpensive By-products for Use in High-Pressure Phenolic Laminates: Reactive Phenosolvan Pitch-Lignin Derived Products for Use in Impregnating Varnishes and Testing of 6-Ply Hessian-Paper Laminates
Item type: Journal Article • Journal: South African Forestry Journal • Authors: R.E. Ysbrandy --- Department of Wood Science, G. F.R. Gerischer --- Department of Wood Science, R.D. Sanderson --- , Republic of South AfricaEqual mixtures of phenosolvan pitch and autohydrolysis bagasse lignin in the presence of either acid or alkaline catalyst and without catalyst were submitted to a thermal treatment stage at 230°C (Phenolation). Each of the phenolated products was mixed with phenol... -
Effect of nutrient calcium on the cell wall composition and digestibility of kikuyu grass (Pennisetum clandestinum Hochst)
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.P. Marais --- , Republic of South Africa D.L. Figenschou --- , Republic of South Africa Maria de Figueiredo --- , Republic of South AfricaThe effect of calcium in the nutrient medium on kikuyu grass (Pennisetum clandestinum Hochst), grown in a solution culture, was investigated. Calcium had no effect on the lignin content of leaf material, but decreased the lignin content per unit stem... -
Effects of rainfall, competition and grazing on flowering of Osteospermum sinuatum (Asteraceae) in arid Karoo rangeland
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: S.J. Milton --- FitzPatrick Institute, Republic of South AfricaThe shrub Osteospermum sinuatum, an important fodder plant in Karoo rangelands, flowered after heavy rain in autumn, winter and spring. The number of flowers produced per bush was positively conelated with basal stem diameter and rainfall in the 12 weeks... -
Effect of planting date on the phenology, seed yield, and fatty acid composition of three sunflower (Helianthus annuus L.) cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.N. de Vos --- , J. Dreyer --- , J.D. Lea --- Department of Crop Science,Four planting dates (early October to mid-January) were used to obtain a range of environmental conditions for growing three sunflower cultivars. The effect of planting date on phenological development was small compared to that of genotype though the hybrid S0404... -
Influence of abscisic acid on polyphenol oxidase browning potential in avocado
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.P. Bower --- , Republic of South Africa J. G.M. Cutting --- , Republic of South AfricaVarious levels of abscisic acid (ABA) were infused into unripened ‘Fuerte’ avocado fruit. After ripening, polyphenol oxidase (PPO) activity was measured, and abscisic acid (ABA) levels monitored. The study showed that an increase in applied ABA increased PPO levels, particularly... -
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... -
Die invloed van saaityd op koring in 'n Mediterreense klimaat I. Fenologiese ontwikkeling
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.W. Loubser --- Departement van Landbou: Wes-Kaap, Republiek van Suid-AfrikaKoringkultivars se aanpassing word grootliks bepaal deur 'n gepaste fenologie en dit word sterk deur saaityd beïnvloed. Om verskille in opbrengs beter te kan verklaar, is kennis van die groeiduurtes van die verskillende ontwikkelingsfases van koring noodsaaklik. Min inligting oor... -
Pentachlorophenol-contaminated soil bioremediation: survival and efficacy of monoculture inoculants and enrichment of indigenous catabolic populations
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. D.K. McBain --- Department of Bioscience and Biotechnology, United Kingdom M.S. Salkinoja-Salonen --- Department of Applied Chemistry and Microbiology, Finland E. Senior --- , South Africa C.A. du Plessis --- Department of Microbiology and Biochemistry, South Africa A. Paterson --- Department of Bioscience and Biotechnology, United Kingdom I.A. Watson-Craik --- Department of Bioscience and Biotechnology, United KingdomSurvival and efficacy of monoculture inoculants of Flavobaderium sp. and Rhodococcus chlorophenolicus to bioremediate PCP-contaminated soil were examined under sterile and non-sterile conditions. Both species effected ≥ 40% catabolism in four weeks although inoculant survival was significantly higher with R... -
Calibration of CERES3 (Maize) to improve silking date prediction values for South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.S. du Toit --- , Republic of South Africa J. Booysen --- , Republic of South Africa J.J. Human --- Department of Agronomy, Republic of South AfricaSilking which coincides with the mid-summer drought in South Africa, could have a significant negative effect on maize yield. Errors in the prediction of silking date could contribute to errors in kernel number simulation, and consequently to errors in yield... -
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... -
Macro and micro element requirements of young and bearing apple trees under drip fertigation
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Grace N. Kangueehi --- Department of Horticultural Science, South Africa P.J.C. Stassen --- , South Africa K.I. Theron --- Department of Horticultural Science, South Africa J. Wooldridge --- , South Africa‘Brookfield Gala’ apple trees on Merton 793 rootstock were planted on a loam sand soil at 2000 trees ha−1, trained to a central leader using the solaxe system and supplied with nutrients by drip fertigation. Trees were individually excavated at... -
Elucidation of seasonal pigmentation patterns in the involucral leaves of Leucadendron ‘Safari Sunset’
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Michael Schmeisser --- Department of Horticultural Science, South Africa Gerard J Jacobs --- Department of Horticultural Science, South Africa Willem J Steyn --- Department of Horticultural Science, South AfricaThis study investigates seasonal pigmentation patterns found in the involucral leaves of Leucadendron ‘Safari Sunset’, with the long-term aim of colour manipulation. Treatments comprised deconed shoots and shoots in which the opening of the flower head was physically prevented. During... -
Effect of different herbage preservation methods on the tannin levels monitored in Eulalia villosa Thunb. (Nees)
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: E.W. du Toit --- , Republic of South Africa M.M. Wolfson --- , Republic of South AfricaTannin concentrations in freeze‐, oven‐ and room‐temperature‐dried samples of leaves of Eulalia villosa Thunb. (Nees), as well as undried material stored at ‐70°C, were determined in order to compare the effect of different preservation methods on the tannin levels measured... -
Responses to sheep browsing at different stocking rates: Water relations, photosynthesis and carbon allocation in two semi‐arid shrubs
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: F. van der Heyden --- ARC ‐ Range and Forage Institute, c/o Department of Botany, Republic of South Africa F. Roux --- , Republic of South Africa C.N. Cupido --- Department of Plant Sciences, Republic of South Africa M.W.P. Leeuw --- Department of Plant Sciences, Republic of South Africa N. Malo --- Department of Plant Sciences, Republic of South AfricaThe ecophysiological responses of two karoo shrubs to sheep browsing at different stocking rates were studied. The responses of a relatively unpalatable shrub (Pteronia tricephala), and of a shrub of greater palatability (Eriocephalus ericoides) were examined at high, intermediate and... -
A novel method for estimating tree dimensions and calculating canopy volume using digital photography
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: AS Barrett --- Applied Behavioural Ecology and Ecosystems Research Unit, South Africa LR Brown --- Applied Behavioural Ecology and Ecosystems Research Unit, South AfricaStudies on plant phenology and browse capacity require effective methods to rapidly quantify plant dimensions such as tree height, height of maximum canopy diameter, height of first leaves, maximum canopy diameter, and diameter of trunk(s) at height of first leaves... -
In vitro organic matter disappearance of tanniferous browse using rumen liquid from goats ingesting grass versus browse
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Caroline C Wambui --- Egerton University, Kenya James P Muir --- Texas A&M AgriLife Research, USA John Githiori --- International Livestock Research Institute, Kenya Barry D Lambert --- Texas A&M AgriLife Research, USAIn vitro organic matter disappearance (IVOMD) of African browse species often indicates artificially low nutritive value due to the presence of condensed tannins (CT). Diet of the rumen liquor donor may change this if it contains CT. Leaves from 11... -
Aftermath of simultaneous toxic spills in the Klein Nyl River, Northern Province, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Jooste L PollingIn late August 1998, a mechanical malfunction at the Nylstroom Sewage Treatment Works resulted in a massive quantity of untreated sewage flowing into the Klein Nyl River. Simultaneously, 5km upstream, a poly-aromatic hydrocarbon poison was simultaneously leaked into the same... -
Enzymatic activities as potential stress biomarkers of two substituted benzene compounds in Propsilocerus akamusi (Diptera: Chironomidae)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CW Cao --- Department of Forest Protection, People's Republic of China XP Li --- Department of Forest Protection, People's Republic of China SL Ge --- Department of Forest Protection, People's Republic of China LL Sun --- Department of Forest Protection, People's Republic of China ZY Wang --- Department of Forest Protection, People's Republic of ChinaChironomids are a globally distributed family of insects that can serve as biological indicators of environmental pollution. Substituted benzenes are a group of serious environmental pollutants and severely threaten biological and human health. In order to investigate potential stress biomarkers... -
Comparison of moult phenology of African penguins Spheniscus demersus at Robben and Dassen islands
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AC Wolfaardt LG Underhill RJM CrawfordDassen and Robben islands are approximately 50 km apart, and currently support the largest and third largest populations of African penguins Spheniscus demersus respectively. At both islands, moult is the most synchronised and seasonal activity of the annual cycle. The... -
Breeding and moult phenology of African penguins Spheniscus demersus at Dassen Island
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AC Wolfaardt --- , South Africa LG Underhill --- Animal Demography Unit, Department of Zoology, South Africa J Visagie --- , South AfricaThe breeding and moult phenology of African penguins Spheniscus demersus at Dassen Island form part of a variable annual cycle. Between 1994 and 2006, African penguins bred throughout the year. Most of this period was characterised by favourable feeding conditions... -
Induced chemical defences in Colophospermum mopane trees
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: DCJ Wessels C van der Waal WF de BoerA field experiment was conducted in which Mopane (Colophospermum mopane) trees were subjected to three different canopy treatments:felling of trees at a mean height of 0.7m above ground level, felling at a height of 2m, or pruning of selected branches... -
Climate and growth influences on wood formation and utilisation
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: GM Downes DM DrewWood is produced by a complex sequence of interactions between gene–protein expression and the local environment. It is produced by the vascular cambium, an essentially two-dimensional surface of meristematic cells covering the tree stem. The growth of any individual cambial... -
Aspects of the breeding ecology of the Purple Swamphen Porphyrio porphyrio in the wetland complex of Guerbes-Sanhadja, north-east Algeria
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Bara Mouslim --- Laboratoire Ecologie des Systèmes terrestres et aquatiques, Algeria Merzoug Seyf Eddine --- Laboratoire Biologie, Eau et Environnement, Algeria Khelifa Rassim --- Laboratoire Biologie, Eau et Environnement, Algeria Bouslama Zihad --- Laboratoire Ecologie des Systèmes terrestres et aquatiques, Algeria Houhamdi Moussa --- Laboratoire Biologie, Eau et Environnement, AlgeriaThe Purple Swamphen Porphyrio porphyrio is a common rail that previously was little investigated in North Africa. From 2011 to 2013, its breeding ecology was studied at two natural wetlands in north-east Algeria, namely Garaet Hadj Tahar and Garaet Messaoussa... -
Effect of production site, storage duration, and hot water and molybdenum dips on bioactive compounds with antioxidant properties in lemon flavedo during cold storage
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Nhlanhla Mathaba --- School of Agricultural, Earth and Environmental Sciences, South Africa John P Bower --- School of Agricultural, Earth and Environmental Sciences, South Africa Isa Bertling --- School of Agricultural, Earth and Environmental Sciences, South AfricaCertain bioactive compounds, such as vitamin E (α-tocopherol), vitamin C (ascorbic acid), β-carotene, polyphenols (e.g. flavonoids and flavonones, viz. hesperidin and naringin) have antioxidant properties and their presence in the citrus flavedo plays a significant role in mitigating oxidative stress,... -
Allelopathic effects of invasive Eucalyptus camaldulensis on germination and early growth of four native species in the Western Cape, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Sheunesu Ruwanza --- Centre for Invasion Biology, Department of Botany and Zoology, South Africa Mirijam Gaertner --- Centre for Invasion Biology, Department of Botany and Zoology, South Africa Karen J Esler --- Centre for Invasion Biology, Department of Conservation Ecology and Entomology, South Africa David M Richardson --- Centre for Invasion Biology, Department of Botany and Zoology, South AfricaEucalyptus camaldulensis Dehnh. (red river gum; Myrtaceae) is an invasive tree in riparian habitats of the Western Cape, South Africa, where it replaces indigenous vegetation and affects ecosystem functioning. These invasions lead to changes in river geomorphology and reduction in... -
Comparison of biochemical compounds and antioxidant activities in date palm bunch fading disorder
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Mahmood Izadi --- Department of Horticultural Science, College of Agriculture, Iran Ali Reza Shahsavar --- Department of Horticultural Science, College of Agriculture, IranDate palm bunch fading disorder, the cause of which remains unknown, is among the most harmful disorders affecting date production. In this study the contents of several biochemical compounds and antioxidant enzyme activity were measured in both faded and non-faded... -
Seasonal changes of nutrient levels and nutrient resorption in Avicennia marina leaves in Yingluo Bay, China
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Shudong Wei --- College of Life Sciences, China Xiaowei Liu --- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, China Lihua Zhang --- Key Laboratory of Coastal Environmental Processes and Ecological Remediation, China Hui Chen --- College of Life Sciences, China Hui Zhang --- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, China Haichao Zhou --- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, China Yiming Lin --- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, ChinaAvicennia marina is a typical mangrove species of subtropical coastlines of China. However, little is known about the retention of nutrients by this species in oligotrophic, coastal environments. In this study, seasonal changes in nitrogen (N) and phosphorus (P) concentrations,... -
Recent population trends of sooty and light-mantled albatrosses breeding on Marion Island
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S Schoombie --- Percy FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, University of Cape Town, South Africa RJM Crawford --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa AB Makhado --- Percy FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, University of Cape Town, South Africa BM Dyer --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa PG Ryan --- Percy FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, University of Cape Town, South AfricaSub-Antarctic Marion Island is one of the few islands where both species of Phoebetria albatrosses breed sympatrically. The last published assessment of their population trends, which reported counts up to 2008, concluded that the numbers of breeding pairs of sooty... -
Cocoa and chocolate consumption – Are there aphrodisiac and other benefits for human health?
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Eo. Afoakwa --- Centre for Food Quality, Strathclyde Institute for Pharmacy and Biomedical Sciences, United KingdomAbstract -
South African indigenous fruits – Underutilized resource for boosting daily antioxidant intake among local indigent populations?
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Daniela Amalia Kucich --- Department of Chemistry, South Africa Merrill Margaret Wicht --- Department of Chemistry, South AfricaConsuming more than seven portions of fruit and vegetables daily substantially lowers the risk of mortality from any cause, yet many South Africans living below the poverty line have a very low or even zero intake of fruit and vegetables... -
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... -
Determining the optimal phenological stage for predicting common dry bean (Phaseolus vulgaris) yield using field spectroscopy
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Perushan Rajah --- Discipline of Geography, School of Agricultural, Earth and Environmental Sciences, South Africa John Odindi --- Discipline of Geography, School of Agricultural, Earth and Environmental Sciences, South Africa Elfatih Abdel-Rahman --- Discipline of Geography, School of Agricultural, Earth and Environmental Sciences, South Africa Onisimo Mutanga --- Discipline of Geography, School of Agricultural, Earth and Environmental Sciences, South AfricaOn-farm crop productivity and yield prediction are valuable for, among others, designing food policies, on-farm and after-farm planning and pricing, and marketing. Whereas existing prediction approaches are generally reliable, these require extensive and tedious field surveys and adequate ancillary agrometeorological... -
Activity of some Nile River aquatic macrophyte extracts against the cyanobacterium Microcystis aeruginosa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MM El-Sheekh --- Botany Department, Faculty of Science, Egypt AM Haroon --- Hydrobiology Laboratory, Egypt S Sabae --- Hydrobiology Laboratory, EgyptThe anti-algal activity of five macrophyte extracts on the cyanobacterium Microcystis aeruginosa in Egypt was investigated in 2013. Extract activity varied according to plant type, extracting solvent and its concentration. The highest inhibitory activity was achieved with ethanol extract at... -
First insights on spatial and temporal distribution patterns of humpback whales in the breeding ground at Sainte Marie Channel, Madagascar
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Trudelle --- Bioacoustics Team, France J-B Charrassin --- Sorbonne Universités (UPMC, Univ. Paris 06) – CNRS-IRD-MNHN, LOCEAN-IPSL, France A Saloma --- Cétamada, Port Barachois, Madagascar S Pous --- Sorbonne Universités (UPMC, Univ. Paris 06) – CNRS-IRD-MNHN, LOCEAN-IPSL, France A Kretzschmar --- Biostatistiques et Processus Spatiaux (BioSP), France O Adam --- Bioacoustics Team, FranceThe Sainte Marie Channel on the northeast coast of Madagascar is an important breeding ground for humpback whales; the first observation of birth was documented there, yet it has never been investigated for phenology and habitat use of humpback whales... -
Identifying phenological functional types in savanna trees
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Nthambeleni D Masia --- Council for Scientific and Industrial Research, Natural Resources and the Environment, South Africa Nicola Stevens --- Global Change and Biodiversity Group, Department of Botany and Zoology, South Africa Sally Archibald --- Council for Scientific and Industrial Research, Natural Resources and the Environment, South AfricaSavannas are notable for the varied patterns of leaf display in the tree layer. Characterising this variation, and assessing the range of phenological strategies apparent in savanna ecosystems will be helpful for understanding savanna tree life-histories and their response to... -
Essential oil composition of Pentzia incana (Asteraceae), an important natural pasture plant in the Karoo region of South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Isabel M Hulley --- Department of Botany and Plant Biotechnology, South Africa Nicholas J Sadgrove --- Department of Botany and Plant Biotechnology, South Africa Patricia M Tilney --- Department of Botany and Plant Biotechnology, South Africa Gulmira Özek --- Department of Pharmacognosy, Faculty of Pharmacy, Turkey Suleyman Yur --- Medicinal Plant, Drug and Scientific Research Center, Turkey Temel Özek --- Department of Pharmacognosy, Faculty of Pharmacy, Turkey Kemal Hüsnü Can Başer --- Department of Pharmacognosy, Faculty of Pharmacy, Northern Cyprus Ben-Erik van Wyk --- Department of Botany and Plant Biotechnology, South AfricaPentzia incana is one of the most important of all natural pasture plants in the dry interior (Karoo) region of South Africa. This highly aromatic shrub is thought to be responsible for the distinctive flavour of Karoo lamb (a registered... -
Assessment of the likely sensitivity to climate change for the key marine species in the southern Benguela system
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Ortega-Cisneros --- Department of Ichthyology and Fisheries Science, South Africa S Yokwana --- Department of Ichthyology and Fisheries Science, South Africa W Sauer --- Department of Ichthyology and Fisheries Science, South Africa K Cochrane --- Department of Ichthyology and Fisheries Science, South Africa A Cockcroft --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa NC James --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa WM Potts --- Department of Ichthyology and Fisheries Science, South Africa L Singh --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa M Smale --- Department of Zoology and Coastal and Marine Research, South Africa A Wood --- Gleneagles Environmental Consulting, South Africa G Pecl --- Institute for Marine and Antarctic Studies, AustraliaClimate change is altering many environmental parameters of coastal waters and open oceans, leading to substantial present-day and projected changes in the distribution, abundance and phenology of marine species. Attempts to assess how each species might respond to climate change... -
Effects of pruning on the concentration of secondary metabolites in Colophospermum mopane leaves
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Rudzani A Makhado --- Department of Biodiversity, South Africa Martin J Potgieter --- Department of Biodiversity, South Africa Wilmien J Luus-Powell --- Department of Biodiversity, South AfricaColophospermum mopane, commonly known as mopane, produces secondary metabolites during the growing season. However, there is still insufficient knowledge on the quantity of secondary metabolites and the effect of browsers on the concentration of secondary metabolites. A pruning experiment was... -
Phytochemical profiling and soluble sugars of African ginger (Siphonochilus aethiopicus) from different growing regions in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Salmina N Mokgehle --- Horticultural Science, School of Agricultural, Earth and Environmental Sciences, South Africa Samson Z Tesfay --- Horticultural Science, School of Agricultural, Earth and Environmental Sciences, South Africa Manaka J Makgato --- Agricultural Research Council–Vegetable and Ornamental Plants, South Africa Hintsa T Araya --- Agricultural Research Council–Vegetable and Ornamental Plants, South AfricaAfrican ginger (Siphonochilus aethiopicus) is distributed in different regions of South Africa and contains bioactive constituents that provide health benefits. However, there is limited information describing the phytochemical and soluble sugars in different parts of the plant from different regions... -
Updated checklist and assemblages of grasshoppers (Orthoptera: Acridomorpha) associated with various habitats, including oases of Central Sahara in Algeria
Item type: Journal Article • Journal: African Zoology • Authors: Abderrahmane Soudani --- , Algeria Abdelhamid Moussi --- , AlgeriaThe grasshopper communities of central Saharan ecosystems (Adrar region, Algeria) were studied at two scales: the first scale considered different biotopes in 23 localities. Random sampling with different traps from February 2016 to February 2019 made it possible to capture... -
Cinereous Vulture Aegypius monachus movements between Europe and Africa show a pattern across the Strait of Gibraltar
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Juan Ramírez --- Malaga University, Spain Javier Elorriaga --- , Spain Andrés de la Cruz --- Spanish Institute of Oceanography (IEO), Spanish National Research Council (CSIC), SpainThe biology of the Cinereous Vulture Aegypius monachus is well known across its breeding range, and the species’ dispersal and movements throughout Europe are widely recorded. However, the ecology of this vulture south of the Mediterranean Sea has been overlooked,... -
Natural recolonisation of sub-Antarctic Marion Island by Common Diving Petrels Pelecanoides urinatrix
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Maëlle Connan --- Marine Apex Predator Research Unit (MAPRU), Institute for Coastal and Marine Research, Nelson Mandela University, South Africa Stefan Schoombie --- Marine Apex Predator Research Unit (MAPRU), Institute for Coastal and Marine Research, Nelson Mandela University, South Africa Janine Schoombie --- FitzPatrick Institute of African Ornithology, DSI-NRF Centre of Excellence, University of Cape Town, South Africa Ben Dilley --- FitzPatrick Institute of African Ornithology, DSI-NRF Centre of Excellence, University of Cape Town, South Africa Peter G Ryan --- FitzPatrick Institute of African Ornithology, DSI-NRF Centre of Excellence, University of Cape Town, South AfricaNocturnal burrow-nesting seabirds are notoriously difficult to study and can go unnoticed for years in remote areas. One of these species is the Common Diving Petrel Pelecanoides urinatrix, which has a circumpolar breeding distribution in the Southern Ocean, including at... -
The influence of grass competition and soil moisture on the growth and phenology of Karoo shrubs in the Eastern Upper Karoo
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Lisa Hebbelmann --- , South Africa Timothy G O’Connor --- , South Africa Justin CO du Toit --- Grootfontein Agricultural Development Institute, South AfricaRainfall in the Nama-Karoo is sporadic and a plant’s ability to access and utilise available soil moisture will determine its ability to persist in the system and to successfully recruit. When summer rainfall in the Eastern Karoo increases, grassiness increases... -
Rooting potential of the ‘vleitee’ honeybush (Cyclopia subternata) as affected by growth season and the manipulation of stock plant characteristics
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: --- Directorate Plant Sciences, South Africa --- Stellenbosch University, South Africa --- Stellenbosch University, South Africa --- Stellenbosch University, South AfricaTo ensure a high-quality, sustainable supply of South African indigenous honeybush (Cyclopia spp.) tea to domestic and international markets, a shift from wild harvesting practices to true-to-type clonal material is required. This study investigated the impact of stock plant rejuvenation... -
Delayed rooting hormone application and stem cutting collection time improved Flacourtia indica rooting ability and root growth
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Simon A Mng’omba --- Lilongwe University of Agriculture and Natural Resources, MalawiFlacourtia indica (Burm.f.) Merr. is an important fruit and medicinal tree in Southern Africa. Efforts to achieve early fruiting have failed with juvenile propagules (planting materials) such as seed. Assessing rooting ability of mature (fruit bearing) F. indica stem cuttings... -
Vertical heterogeneity of chemical constituents and in vitro ruminal fermentation parameters in browse tree leaves
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Kgaogelo P Meso --- North-West University, South Africa Caven M Mnisi --- North-West University, South Africa Martin P Hughes --- University of the West Indies, Abubeker Hassen --- University of Pretoria, South Africa Solomon T Beyene --- University of Fort Hare, Victor Mlambo --- University of Mpumalanga, South AfricaRepeated herbivory has the potential to induce adaptive chemical changes in the leaves of browse plants, which can alter their nutritive value. This study examined the interactive effect of tree species and harvest height on chemical composition and in vitro...