Search
Search results for
We found
143 results for you
-
Micropropagation of Eucalyptus radiata ssp. radiata Using Explants from Mature and Coppice Material
Item type: Journal Article • Journal: South African Forestry Journal • Authors: S.H. Chang --- Department of Forestry, RSA D. G.M. Donald --- Department of Forestry, RSA G. Jacobs --- Department of Horticulture, RSANodes from young field-grown coppice regrowth and branches of a mature tree of Eucalyptus radiata ssp. radiata were cultured on a MS medium containing BA and NAA. BA at 0,5 mg/ℓ and NAA at 0,01-0,1 mg/ℓ were most effective in... -
The relative yield potential of westerwolds and Italian ryegrass cultivars in autumn‐planted pastures and their flowering patterns following spring‐establishment
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: D.C.W. Goodenough --- Department of Agriculture and Water Supply (Natal Region), A. Smith --- Department of Agriculture and Water Supply (Natal Region), MarieF. Smith --- Department of Agriculture and Water Supply (Natal Region),Herbage yields from autumn‐planted Lolium multiflorum cultivar trials conducted in the Natal Mist Belt indicated that, in general, the Westerwolds ryegrass cultivars had greater yield potential than the Italian ryegrass cultivars during the cold winter months. Conversely, the Italian ryegrass... -
‘n Vergelyking van wei‐ en voergewasse vir die produksie van slaglammers in die Pretoria‐ Witwatersrand‐Vereeniging(PWV)‐gebied
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: P.A. Pieterse --- Departement Plantproduksie, Republiek van Suid‐Afrika J.O. Grunow --- Departement Plantproduksie, Republiek van Suid‐Afrika N.F.G. Rethman --- Departement Plantproduksie, Republiek van Suid‐Afrika W.A. van Niekerk --- Departement Veckunde, Republiek van Suid‐AfrikaA comparison of pasture and fodder crops for the production of slaughter lambs in the Pretoria‐Witwatersrand‐Vereeniging (PWV) area. A number of pasture and fodder species were evaluated for the production of mutton with weancr lambs. Animal performance and meat production... -
Responses of Italian ryegrass to phosphorus on highly‐weathered soils
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: N. Miles --- Department of Agricultural Development, Republic of South Africa R.J. Eckard --- Department of Agricultural Development, Republic of South Africa J.M. deVilliers --- Department of Agronomy, Republic of South AfricaItalian ryegrass (Loliwn multiflorum cv. Midmar) responses to fertilizer P were studied in field experiments under irrigation on highly‐weathered ferrallitic soils at two localities in Natal. Each experiment was conducted over two seasons (1985 and 1986), the pasture being re‐established... -
Seasonal uptake and distribution of nutrient elements by kiwifruit vines 1. Macronutrients
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. A.G. Kotzé --- , Republic of South Africa Johanna de Villiers --- , Republic of South AfricaDry matter production and uptake and distribution of macronutrients in kiwifruit vines (Actinidia deliciosa (A. Chev.) C.F. Liang et A.R. Ferguson var. deliciosa) cv. Hayward were studied in sand culture. The total dry mass of the kiwifruit vine increased sharply... -
Seasonal uptake and distribution of nutrient elements by kiwifruit vines 2. Micronutrients
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. A.G. Kotzé --- , Republic of South Africa Johanna de Villiers --- , Republic of South AfricaUptake and distribution of micronutrients by kiwifruit vines (Actinidia deliciosa (A. Chev.) C.F. Liang et A.R. Ferguson var. deliciosa) cv. Hayward were studied in sand culture. The period of rapid accumulation of different micronutrients differed substantially. Zinc was accumulated mainly... -
The yield response of annual ryegrass (Lolium multiflorum) to varying nitrogen fertilizer application strategies
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.J. Eckard --- , Republic of South Africa P.E. Bartholomew --- , Republic of South Africa N.M. Tainton --- Department of Grassland Science, Republic of South AfricaAnnual ryegrass (Lolium multiflorum LAM. cv. Midmar) pastures were established on three sites, representing the Avalon, Katspruit and Inanda soil forms, with cut-plot experimentation over a period of four years (1987 - 1990). Nitrogen fertilizer was top-dressed at 0, 200,... -
THE LIMNOLOGY OF SOME SOUTH AFRICAN IMPOUNDMENTS I. THE PHYSICO-CHEMICAL LIMNOLOGY OF HARTBEESPOORT DAM
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: W.E. Scott --- , South Africa M.T. Seaman --- , South Africa A.D. Connell --- , South Africa S.I. Kohlmeyer --- , South Africa D.F. Toerien --- , South AfricaHartbeespoort Dam is a eutrophic, warm monomictic lake with overturn occurring in April. The lake is stratified for about six months of the year and in late summer the stratification appears stable. Light penetration in the dam depends both on... -
SOME ASPECTS OF THE DISTRIBUTION OF REACTIVE PHOSPHORUS IN LAKE McILWAINE, RHODESIA: PHOSPHORUS LOADING AND SEASONAL RESPONSES
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: J.A. Thornton --- Hydrobiology Research Unit,Between November 1976 and September 1977, samples were taken on a fortnightly basis from a representative station in Lake McIlwaine. In addition an intensive study of the riverine input of reactive phosphorus was conducted. Samples were analysed for total reactive... -
THE BENTHIC MACROINVERTEBRATE FAUNA OF A SOUTH AFRICAN MOUNTAIN STREAM AND ITS RESPONSE TO FIRE
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: D.L. Britton --- Freshwater Research Unit, Zoology Department, South AfricaThe effects of a late-summer prescribed burn on the temperature and benthic macroinvertebrate fauna of a south-western Cape mountain stream were investigated over a period of 12 months. Temperature and discharge regimes appear well-defined and relatively predictable from year to... -
CIRCULATION IN HIGHLY STRATIFIED SOUTHERN AFRICAN ESTUARIES
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: J.L. Largier --- , USA J.H. Slinger --- Council for Scientific and Industrial Research, South AfricaThe nature of estuarine circulation under highly stratified conditions is reviewed in the context of southern African estuaries that are small and have a constricted connection to the ocean. While the focus is on the generic hydrodynamic processes and features,... -
SOME OBSERVATIONS ON THE FISH LIFE IN A SEASONAL SAND RIVER
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: B. C.W. van der Waal --- , , South AfricaFive fish species were collected in a seasonal sand river that had migrated upstream more than 150 km from the permanent Limpopo River. The population structure indicated that mainly juveniles had taken part in this colonisation. No fish were collected... -
VARIABILITY IN THE INVERTEBRATE FAUNA OF AN INTERMITTENT STREAM OVER THREE CONSECUTIVE MIDSUMMER PERIODS
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: M. C. Uys --- , South Africa J. H. O'Keeffe --- , South AfricaNon-perennial rivers in semi-arid regions are exposed to unpredictable and highly variable rainfall and hydrology which can have considerable effects on faunal organisation at different scales. Spatial and temporal dynamics in the aquatic invertebrate fauna of an aseasonal intermittent river... -
Preliminary results of a stocking rate trial in Lesotho
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: LM Mpiti-Shakhane GY Kanyama-Phiri WO Odenya JW BandaForage responses to stocking rates and seasons were determined over a one-year period. The experimental design consisted of three stocking rates namely, light (2.0ha LSU-1), moderate (1.25ha LSU-1) and heavy (0.5ha LSU-1) and four seasons (autumn, winter, spring and summer)... -
Mineral element status of soils, native pastures and cattle blood serum in the mid-altitude of western Ethiopia
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Lemma Gizachew Adane Hirpha Fikadu Jalata G N SmitDespite the crucial role of mineral elements in animal production and health, their status in soil, native pasture and animal body tissues or fluids in the mid-altitude of Ethiopia has had little study. To determine the concentration of mineral elements... -
Effect of Balanites glabra canopy cover on grass production, organic matter and soil moisture in a southern Kenyan rangeland
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: VO Wasonga RK Ngugi DM Nyariki G Kironchi TJ NjokaA study was undertaken in Kenya's southern savanna rangelands to determine the seasonal effect of Balanites glabra canopy cover on aboveground grass biomass, grass species composition, soil organic matter and soil moisture content. The study was conducted during the period... -
Seasonal botanical and chemical composition of sheep and goat diets on a common range in eastern Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: RobinsonK Ngugi JosephN Ndung'u DicksonM Nyariki NashonKR MusimbaThe botanical and chemical composition, intake and digestibility of local sheep (Ovis aries) and goat (Capra hirtus) diets were evaluated over the wet (growing) and dry (dormant) seasons. Diet botanical composition was related to the vegetation composition on the range... -
Phenology of woody plants in riverine thicket and its impact on browse availability to game species
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: BB Janecke --- Animal, Wildlife and Grassland Sciences, South Africa GN Smit --- Animal, Wildlife and Grassland Sciences, South AfricaThe study area was located in the central Free State Grassland biome, but the vegetation partially represented riparian thicket. Leaf carriage patterns of deciduous species were determined from September 2004 to August 2008. Similarities existed between Acacia karroo and Diospyros... -
Fish migrations in two seasonal streams in Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Brian Gratwicke BrianE MarshallFish migrations into the streams of seasonally-flooded depressions (or dambos) that cover the central plateaus of Africa are a well-known phenomenon to scientists and lay people alike. However, the factors causing seasonal migrations are poorly understood and most scientific references... -
Bacterial levels in the Nyl River system, Limpopo province, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: R Greenfield --- Centre for Aquatic Research, Department of Zoology, South Africa JHJ van Vuren --- Centre for Aquatic Research, Department of Zoology, South Africa V Wepener --- Centre for Aquatic Research, Department of Zoology, South AfricaBecause water quantity and quality are of great importance in the arid Limpopo province, the bacterial content of water in the Nyl River System and its possible origins were assessed at five sites. Quarterly surveys took place between April 2001... -
Feeding dynamics of Palaemon peringueyi (Decapoda, Caridea) in the temporarily open/closed Kasouga Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PW Froneman --- Department of Zoology and Entomology, South Africa TO Henninger --- Department of Zoology and Entomology, South AfricaThe feeding ecology of the caridean shrimp Palaemon peringueyi in the temporarily open/closed Kasouga Estuary, Eastern Cape, was examined during summer and winter employing stomach fullness index (SFI) analysis. Mean SFI values for male and female shrimp during summer ranged... -
Zooplankton abundance and composition in the hypertrophic Rietvlei Dam, South Africa, negate prospects for its remedial ‘top-down’ biomanipulation
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: RC Hart --- School of Life Sciences, South AfricaCrustacean zooplankton abundance and composition were determined at one offshore and three nearshore sites in the hypertrophic Rietvlei Dam on 19 dates between July 2009 and December 2011. Total biomass fluctuated seasonally, generally declining from spring to winter through the... -
Reproductive biology of Bagrus docmak in the Victoria Nile, Uganda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: C Aruho --- National Fisheries Resources Research Institute, Uganda RK Basiita --- National Fisheries Resources Research Institute, Uganda D Kahwa --- Department of Wildlife and Animal Resources Management, Uganda G Bwanika --- Department of Zoology, Uganda J Rutaisire --- National Fisheries Resources Research Institute, UgandaAspects of the reproductive biology of Bagrus docmak in the Victoria Nile were investigated between November 2005 and October 2006. Macroscopic and histological analysis of the gonads confirmed it as an asynchronous batch spawner which spawns throughout the year with... -
Seasonal Changes in Foliar Nutrient Content of E. grandis
Item type: Journal Article • Journal: South African Forestry Journal • Authors: A. P.G. Schönau --- ,The monthly variations in the concentrations of six macro- and four micro-nutrients in the foliage of Eucalyptus grandis were studied at three different sites for a period of two years, when the trees were between one and three years of... -
The Effect of Season on the Root Growth Capacity of One-Year-Old Pinus radiata Seedlings
Item type: Journal Article • Journal: South African Forestry Journal • Authors: D. G.M. Donald --- ,The effect of season on the Root Growth Capacity (RGC) of conditioned Pinus radiata D.D. seedlings was tested for three years. Results indicate that although the species grows actively throughout the year there is still a marked seasonal fluctuation in... -
Sharks caught in the protective gill nets off KwaZulu-Natal, South Africa. 10. The dusky shark Carcharhinus obscurus (Lesueur 1818)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SFJ Dudley G Cliff MP Zungu MJ SmaleBetween 1978 and 1999, a total of 5 626 dusky sharks Carcharhinus obscurus, constituting 20% of the total shark catch, was caught in the protective nets off KwaZulu-Natal, South Africa. The mean annual catch was 256 sharks (SD = 107.5,... -
Seasonal variation in phytoplankton in the southern Benguela: pigment indices and ocean colour
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Barlow H Sessions M Balarin S Weeks C Whittle L HutchingsPigment indices and satellite imagery were used to investigate the seasonal variation in phytoplankton in the southern Benguela, with the aid of monthly monitoring on two transect lines. Sea surface temperature images revealed the similarity in thermal conditions during autumn,... -
Sharks caught in the protective gill nets off KwaZulu-Natal, South Africa. 11. The scalloped hammerhead shark Sphyrna lewini (Griffith and Smith)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: P de Bruyn SFJ Dudley G Cliff MJ SmaleBetween 1978 and 1998, a total of 3 385 scalloped hammerhead sharks Sphyrna lewini was caught in the protective nets off KwaZulu-Natal. The mean annual catch was 166 sharks (range 60–279). There was a significant decrease in catch rate with... -
Sharks caught in the protective gill nets off KwaZulu-Natal, South Africa. 12. The African angel shark Squatina africana (Regan)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RL Shelmerdine G CliffBetween 1980 and 2001, a total of 661 African angel sharks Squatina africana was caught in the protective nets off KwaZulu-Natal, South Africa. The mean annual catch was 30 sharks (range = 11–69, SD = 12.4), with no trend in... -
Migration redefined? Seasonality, movements and group composition of humpback whales Megaptera novaeangliae off the west coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Barendse --- , South Africa PB Best --- , South Africa M Thornton --- , South Africa C Pomilla --- , USA I Carvalho --- , USA HC Rosenbaum --- , USAThe migration of Southern Hemisphere humpback whales Megaptera novaeangliae between their feeding and breeding areas has thus far been considered a highly predictable and seasonal event. However, previous observations on the humpbacks that pass through the nearshore waters of the... -
Distribution patterns of striped mullet Mugil cephalus in mangrove creeks, Zanzibar, Tanzania
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AW Mwandya --- Department of Animal Sciences and Production, Tanzania YD Mgaya --- Department of Aquatic Sciences and Technology, Tanzania MC Öhman --- Department of Zoology, Sweden I Bryceson --- , Norway M Gullström --- Department of Zoology, SwedenSpatial and seasonal variations in density of striped mullet Mugil cephalus were investigated in four mangrove creeks in Zanzibar, Tanzania, during a one-year cycle. Fish were collected monthly in the lower, intermediate and upper reaches of each creek using a... -
Buoyancy-stirring interactions in a subtropical embayment: a synthesis of measurements and model simulations in Maputo Bay, Mozambique
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JD Lencart e Silva --- , UK JH Simpson --- , UK AM Hoguane --- School of Marine and Coastal Sciences, Mozambique J-L Harcourt-Baldwin --- Department of Oceanography, South AfricaMaputo Bay, on the coast of Mozambique, is a tidally energetic, subtropical embayment in a region subjected to strong seasonal rainfall. Data from moored current meters, tide gauges and monthly bay-wide surveys were used to characterise the evolution of the... -
Influence of the annual sardine run on catches of large sharks in the protective gillnets off KwaZulu-Natal, South Africa, and the occurrence of sardine in shark diet
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SFJ Dudley --- , South Africa G Cliff --- , South AfricaShark catches in the protective nets set off the beaches of KwaZulu-Natal (KZN), South Africa, are strongly influenced by the sardine run, the winter influx of shoals of Sardinops sagax from the south-west. The effect of the sardine run, which... -
Seasonal variations of agar extracted from different life stages of Gracilaria cliftonii (Gracilariales, Rhodophyta) from Western Australia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Muñoz --- Centre for Environment and Sustainable Aquaculture, Faculty of Science and Engineering, Australia R Fotedar --- Centre for Environment and Sustainable Aquaculture, Faculty of Science and Engineering, AustraliaSeasonality in yield, physical and chemical properties of the native agar from different life stages of Gracilaria cliftonii was investigated over a period of six seasons (autumn 2008–winter 2009). Agar yield and its properties varied as a function of seasons... -
Prey and seasonal abundance of killer whales at sub-Antarctic Marion Island
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RR Reisinger --- Mammal Research Institute, Department of Zoology and Entomology, South Africa PJN de Bruyn CA Tosh WC Oosthuizen NT Mufanadzo MN BesterThe diet of killer whales Orcinus orca was investigated from 48 predation events observed during 823 sightings at sub-Antarctic Marion Island between 2006 and 2009. From these events, there were 10 cases where prey could be identified. Killer whales fed... -
Distribution and movement of scalloped hammerhead Sphryna lewini and smooth hammerhead Sphyrna zygaena sharks along the east coast of southern Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: KM Diemer --- Great Lakes Institute of Environmental Research, Canada BQ Mann --- , South Africa NE Hussey --- Great Lakes Institute of Environmental Research, CanadaKnowledge of population distribution and movement is crucial for the conservation and management of shark species occurring in coastal waters. From 1984 to 2009, 641 scalloped hammerheads Sphyrna lewini, 1 342 smooth hammerheads Sphyrna zygaena and 1 352 unspecified hammerheads... -
Seasonal fluctuations in occurrence of inshore Bryde's whales in Plettenberg Bay, South Africa, with notes on feeding and multispecies associations
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GS Penry --- , UK VG Cockcroft --- Department of Zoology, Nelson Mandela Metropolitan University, South Africa PS Hammond --- , UKSeasonal fluctuations in the occurrence of inshore South African Bryde's whales Balaenoptera edeni were investigated between November 2005 and June 2008. Sighting data were collected in Plettenberg Bay on the south-east coast of South Africa. Bryde's whale occurrence was modelled... -
Impact of protective shark nets on sea turtles in KwaZulu-Natal, South Africa, 1981–2008
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: W Brazier --- Department of Zoology, South Africa R Nel --- Department of Zoology, South Africa G Cliff --- , South Africa S Dudley --- , South AfricaShark nets were established along the KwaZulu-Natal coast in 1952 to protect bathers against shark encounters. Sea turtle bycatch data for the period 1981–2008 in these shark nets indicated that loggerheads Caretta caretta were caught most frequently at 40.9 y–1... -
White sharks Carcharodon carcharias at Bird Island, Algoa Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ML Dicken --- Department of Ichthyology and Fisheries Science, South Africa MJ Smale --- , South Africa AJ Booth --- Department of Ichthyology and Fisheries Science, South AfricaWe present the first quantitative study of the occurrence, size and sex of white sharks Carcharodon carcharias at Bird Island, Algoa Bay. Twenty-two boat trips were made to Bird Island between November 2009 and October 2011 to chum for sharks... -
Diet and prey selection in late-stage larvae of five species of fish in a temperate estuarine nursery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: NA Strydom --- Department of Zoology, South Africa K Sutherland --- Department of Zoology, South Africa TH Wooldridge --- Department of Zoology, South AfricaThe plankton assemblage of the permanently open Sundays Estuary in South Africa was sampled seasonally to provide further information on the feeding ecology of the larval stages of fishes in temperate estuaries. Collections were made between winter 2007 and autumn... -
Dry season fish survival in isolated pools and within sand-beds in the Mzingwane River, Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JohnL MinshullFour isolated pools in the otherwise dry Mzingwane River, Zimbabwe, were sampled in December 1985 and a total of 4 547 specimens of 23 species were collected. The dominant species, by number, were Chiloglanis paratus, followed by Barbus toppini, Mesobola... -
Variation in benthic macroinvertebrate assemblages in Ologe Lagoon, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TundeOT ImoobeThe community structure, diversity and seasonal variation of the benthic macroinvertebrates in Ologe Lagoon were studied at four sites during the dry and wet seasons of 2003 to provide environmental baseline data for the lagoon. The community comprised 29 taxa... -
Spatial and temporal variation in the macroinvertebrate community structure of the lower Elands River, Mpumalanga, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Ferreira --- Centre for Aquatic Research, Department of Zoology, South Africa V Wepener --- Centre for Aquatic Research, Department of Zoology, South Africa JHJ van Vuren --- Centre for Aquatic Research, Department of Zoology, South AfricaThe Elands River, Mpumalanga, is an ecologically sensitive river that is constantly threatened by a variety of human activities. The influence of a pulp and paper mill on the river's macroinvertebrate assemblages was studied in March and June 2005, representing... -
Role of pelagic crustaceans in the diet of the longnose lancetfish Alepisaurus ferox in the Seychelles waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Potier F Ménard Y Cherel A Lorrain R Sabatié F MarsacThe role of pelagic crustaceans in the diet of the longnose lancetfish Alepisaurus ferox was investigated from stomach content analysis of fish collected in the waters surrounding the Seychelles Archipelago in the western Indian Ocean. Crustaceans accounted for 88.4% by... -
Seasonal nutrient fluctuation in selected plant species in the Kalahari
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: FH Stapelberg MW van Rooyen J du P BothmaSeasonal changes in crude protein, phosphorus and calcium contents of five common plant species in the south-western Kalahari were investigated. Three species that are browsed by springbok (Acacia erioloba, Grewia flava and Rhigozum trichotomum) and two grass species (Schmidtia kalahariensis... -
Trophic investigations of Cape fur seals at the easternmost extreme of their distribution
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Connan --- Department of Zoology, South Africa GJG Hofmeyr --- Department of Zoology, South Africa MJ Smale --- Department of Zoology, South Africa PA Pistorius --- Department of Zoology, South AfricaThe diet of Cape fur seals Arctocephalus pusillus pusillus in the eastern portion of their distribution has received little attention previously, and was studied using traditional methods only. In 2013 we therefore assessed the diet of seals at the easternmost... -
Microalgal responses to physico-chemical variability in the small temporarily open/closed Seteni Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NK Carrasco --- School of Life Sciences, South Africa R Perissinotto --- School of Life Sciences, South AfricaThe Seteni Estuary is a small temporarily open/closed estuary (TOCE) in South Africa under the influence of agricultural practices. While the general significance of microalgae to estuarine production is widely recognised, the factors regulating microalgal biomass in these heterogeneous systems... -
Do SASS5 scores vary with season in the South African highveld? A case study on the Skeerpoort River, North West province, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: HE Fourie --- Department of Zoology and Entomology, South Africa C Thirion --- Department of Water Affairs: Resource Quality Services, South Africa CW Weldon --- Department of Zoology and Entomology, South AfricaMacroinvertebrate assemblages can vary with season as a result of changing environmental conditions and phenology of individual species. The objective of this study was to determine whether results from the South African Scoring System version 5 (SASS5) are affected by... -
Spatio-temporal variation in density of microphytoplankton genera in two tropical coral reefs of Mauritius
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SB Sadally --- Department of Biosciences, Faculty of Science, Mauritius N Taleb-Hossenkhan --- Department of Biosciences, Faculty of Science, Mauritius R Bhagooli --- Department of Biosciences, Faculty of Science, MauritiusSpatial and temporal (seasonal and interannual) variation in microphytoplankton was investigated at two tropical coral reef sites off Mauritius (Belle Mare [BM] and Flic-en-Flac [FEF]), from 2010 to 2012. Each site was divided into three zones: coast, lagoon and reef... -
Soil organic carbon and nitrogen stocks along a seasonal wetland (dambo) transect in central Zimbabwe
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: George Nyamadzawo --- Department of Soil Science and Agricultural Engineering, Zimbabwe Menas Wuta --- Department of Soil Science and Agricultural Engineering, Zimbabwe Justice Nyamangara --- International Crops Research Institute for the Semi Arid Tropics, Matopos Research Station, Zimbabwe Philip Nyamugafata --- Department of Soil Science and Agricultural Engineering, ZimbabweEcosystems of central and southern Africa are occupied by some of the largest seasonal wetlands commonly called dambos. Dambos are likely to store huge stocks of soil organic carbon (SOC) because of their saturated conditions. However, most available literature report... -
An innovative drought early warning system for sub-Saharan Africa: integrating modern and indigenous approaches
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Muthoni Masinde --- Department of Information Technology, South AfricaDroughts remain the number one disaster in Africa; drought is responsible for over 88% of all the types of disasters that people are affected by. An effective drought early warning system can support appropriate mitigation and preparedness strategies and hence... -
Seasonal variation in stomach contents and diet composition in the large girdled lizard, Cordylus giganteus (Reptilia: Cordylidae) in the Highveld grasslands of the northeastern Free State, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: J.H. van Wyk --- Zoology Department, South AfricaCordylus giganteus is endemic to the Highveld grasslands of South Africa. Owing to limited distribution and extensive habitat destruction, it may be regarded as an endangered species. C. giganteus individuals fed during eight months of the year. The mass of... -
Species composition and recruitment of tidal pool fishes in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Lynnath E. Beckley --- Oceanographic Research Institute, South AfricaFishes occurring in a lower shore tidal pool near Durban, South Africa, were collected using rotenone at monthly intervals for a year. Eighteen teleost families and 50 lower taxa of fishes were recorded. Cryptic Tripterygiidae, Blenniidae and Gobiidae were particularly... -
Home range and seasonal movement of elephants in the Kunene Region, northwestern Namibia
Item type: Journal Article • Journal: African Zoology • Authors: Keith E.A. Leggett --- Namibian Elephant and Giraffe Trust, NamibiaThis paper examines the home ranges and seasonal movements of eight GPS-collared elephants (two females and six males) in the northwestern Kunene region of Namibia. Minimum convex polygon (MCP) and the fixed kernel density estimation (FKDE) methods were used to... -
African elephant home range and habitat selection in Pongola Game Reserve, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Graeme Shannon --- Amarula Elephant Research Programme, School of Biological and Conservation Sciences, University of KwaZulu-Natal, South Africa Bruce Page --- Amarula Elephant Research Programme, School of Biological and Conservation Sciences, University of KwaZulu-Natal, South Africa Rob Slotow --- Amarula Elephant Research Programme, School of Biological and Conservation Sciences, University of KwaZulu-Natal, South Africa Kevin Duffy --- Durban Institute of Technology, South AfricaThe ranging behaviour and habitat occupancy by three elephant groups (cow herd, bulls, and an orphan group) were studied over a two-year period in a small, fenced reserve. No summer dispersal was observed. Distinct seasonal home ranges were exhibited for... -
Variation in the timing of reproduction of the four-striped field mouse, Rhabdomys pumilio, in the Eastern Cape Province, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Claire Jackson --- Department of Zoology and Entomology, South Africa Ric T. F. Bernard --- Department of Zoology and Entomology, South AfricaWe used the four-striped field mouse, Rhabdomys pumilio (Sparrmann, 1784), to test the hypothesis that reproduction in a small, short-lived mammal will be opportunistic, characterized by temporal and spatial variation in the timing of events, and only be inhibited under... -
Seasonal variation in gonadal steroids of males and females in the Cape mole-rat (Georychus capensis): the potential for opportunistic breeding
Item type: Journal Article • Journal: African Zoology • Authors: M. K. Oosthuizen --- Department of Zoology and Entomology, South Africa N. C. Bennett --- Department of Zoology and Entomology, South AfricaUrinary testosterone concentrations in males and urinary progesterone and oestradiol concentrations in females were measured in the Cape mole-rat (Georychus capensis) and compared for the summer and winter periods. The Cape mole-rat breeds seasonally, with sexual activity and subsequent pregnancy... -
Field evidence for colony size and aseasonality of breeding and in Ansell’s mole-rat, Fukomys anselli (Rodentia: Bathyergidae)
Item type: Journal Article • Journal: African Zoology • Authors: A.M. Sichilima --- Mammal Research Institute, Department of Zoology and Entomology, South Africa N.C. Bennett --- Mammal Research Institute, Department of Zoology and Entomology, South Africa C.G. Faulkes --- School of Biological and Chemical Sciences, Queen Mary, University of London, U.K.Ansell’s mole-rat, Fukomys anselli, is a cooperatively breeding bathyergid endemic to the Lusaka Province of Zambia. During a 12-month field study involving the capture of 33 colonies of mole-rats, the number of occupants, breeding females and sex ratio within colonies... -
Spatial and temporal variation in cadmium body loads of four intertidal invertebrates from False Bay, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: A.J. Reinecke --- Department of Botany and Zoology, South Africa N.P. Mdzeke --- Department of Botany and Zoology, South Africa S.A. Reinecke --- Department of Botany and Zoology, South AfricaIncreasing urbanization and industrialization along the coastal areas of False Bay in South Africa can endanger coastal ecosystems because of increasing metal pollution. To obtain baseline data on contamination levels in the intertidal zone, cadmium (Cd) body loads of four... -
Seasonal effects on digging activity and burrow architecture in the Cape dune mole-rat, Bathyergus suillus (Rodentia: Bathyergidae)
Item type: Journal Article • Journal: African Zoology • Authors: H.G. Thomas --- Mammal Research Institute, Department of Zoology and Entomology, South Africa P.W. Bateman --- Mammal Research Institute, Department of Zoology and Entomology, South Africa M. Scantlebury --- Mammal Research Institute, Department of Zoology and Entomology, South Africa N.C. Bennett --- Mammal Research Institute, Department of Zoology and Entomology, South AfricaMost polygynous male mammals exhibit little or no parental care or involvement raising young. Instead, they invest indirectly in their own morphological and physiological attributes which enhance their chance of reproduction. Such secondary morphological sex traits may contribute to differences... -
Seasonal differences in foraging dynamics, habitat use and home range size of Wahlberg’s epauletted fruit bat in an urban environment
Item type: Journal Article • Journal: African Zoology • Authors: Dominic P. Rollinson --- School of Life Sciences, University of KwaZulu-Natal, South Africa Joy C. Coleman --- School of Life Sciences, University of KwaZulu-Natal, South Africa Colleen T. Downs --- School of Life Sciences, University of KwaZulu-Natal, South AfricaUrbanization through the process of habitat loss and fragmentation affects ecosystems. Many species are no longer able to survive in these urban areas; however, there are some that have been able to persist and even thrive in these habitats. One... -
Solitary individuals in populations of the group-living lizard Ouroborus cataphractus: voluntary or forced?
Item type: Journal Article • Journal: African Zoology • Authors: P. le Fras N. Mouton --- Department of Botany & Zoology, South Africa Janine L. Glover --- Department of Botany & Zoology, South Africa Alexander F. Flemming --- Department of Botany & Zoology, South AfricaWe compared crevice fidelity among solitary and group-living individuals in a population of the group-living lizard Ouroborus cataphractus. We also compared the incidence of solitary individuals between the sexes and different seasons.We surveyed suitable rocky areas at two sites in... -
Do aquatic macroinvertebrate communities respond to land-use effects in the Wilge River, Mpumalanga, South Africa?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: K Farrell --- Golder Associates Africa (Pty) Ltd, South Africa JHJ van Vuren --- Department of Zoology, South Africa M Ferreira --- Department of Zoology, South AfricaAquatic macroinvertebrate community responses to the effects of various land uses were investigated in 2010–2013 in the Wilge River, a tributary of the Olifants River, South Africa. The catchment area is characterised by agricultural, mining and industrial activities, which potentially... -
Ectoparasite diversity in the eastern rock sengis (Elephantulus myurus): the effect of seasonality and host sex
Item type: Journal Article • Journal: African Zoology • Authors: Dina M Fagir --- Mammal Research Institute, Department of Zoology and Entomology, University of Pretoria, South Africa Ivan G Horak --- Department of Veterinary Tropical Diseases, Faculty of Veterinary Science, University of Pretoria, South Africa Eddie A Ueckermann --- Agricultural Research Council–Plant Protection Research Institute, South Africa Nigel C Bennett --- Mammal Research Institute, Department of Zoology and Entomology, University of Pretoria, South Africa Heike Lutermann --- Mammal Research Institute, Department of Zoology and Entomology, University of Pretoria, South AfricaGlobally small mammals are important hosts of ectoparasite vectors of pathogens of medical, veterinary and economic importance. Insectivores are currently understudied as hosts of pathogen vectors. However, data are needed on the diversity of such vectors before we can investigate... -
Baited remote underwater video system (BRUVs) survey of chondrichthyan diversity in False Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L De Vos --- Marine Research Institute, Department of Biological Sciences, South Africa RGA Watson --- Marine Research Institute, Department of Biological Sciences, South Africa A Götz --- Elwandle Node, South African Environmental Observation Network (SAEON), South Africa CG Attwood --- Marine Research Institute, Department of Biological Sciences, South AfricaGlobal declines in chondrichthyan populations necessitate evidence‑based planning for their conservation. False Bay, in south‑west South Africa, has a high diversity of marine biota, with Atlantic and Indian Ocean influences, but its chondrichthyan fauna is poorly described ecologically. False Bay... -
Seasonal and genotypic variation of water-soluble polysaccharide content in leaves of Cyclocarya paliurus
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Xiangxiang Fu --- Co-Innovation Center for Sustainable Forestry in Southern China, China Xiaodong Zhou --- Co-Innovation Center for Sustainable Forestry in Southern China, China Bo Deng --- Co-Innovation Center for Sustainable Forestry in Southern China, China Xulan Shang --- Co-Innovation Center for Sustainable Forestry in Southern China, China Shengzuo Fang --- Co-Innovation Center for Sustainable Forestry in Southern China, ChinaCyclocarya paliurus (Batal) Iljinskaja is an important medicinal woody plant due to numerous bioactive natural products in its leaves. As an important bioactive natural product, water-soluble polysaccharides (WSP) in leaves of C. paliurus possess diverse biological activities, such as hypoglycemic,... -
Enteropathogens associated with the seasonal fuctuations in plasma sodium and potassium levels in childhood diarrhoea
Item type: Journal Article • Journal: Southern African Journal of Epidemiology and Infection • Authors: V Pillay-van Wyk --- Burden of Disease Research Unit, G Swingler --- School of Child and Adolescent Health,This paper aims to assess the clinical, nutritional, microbiological, environmental and socio-economic determinants that have a seasonal distribution, or are potential confounders of a seasonal association of previously described seasonal fuctuations in plasma sodium and potassium concentrations in children with... -
Spatial aspects of the reproductive and feeding biology of the striped robber, Brycinus lateralis (Pisces: Characidae), in the Okavango Delta, Botswana
Item type: Journal Article • Journal: African Zoology • Authors: Anthony J. Booth --- Department of Ichthyology and Fishery Science, South Africa Bruce W. McKinlay --- Department of Ichthyology and Fishery Science, South AfricaThe Okavango Delta is a vast inland wetland system situated in northern Botswana. High rainfall is received in early summer in the southern Angolan highlands and throughout the Delta with the flood waters reaching the upper riverine floodplain between March... -
Killer whales (Orcinus orca) at Marion Island, Southern Ocean
Item type: Journal Article • Journal: African Zoology • Authors: M. Keith --- Mammal Research Institute, University of Pretoria, South Africa M.N. Bester --- Mammal Research Institute, University of Pretoria, South Africa P.A. Bartlett --- Mammal Research Institute, University of Pretoria, South Africa D. Baker --- Mammal Research Institute, University of Pretoria, South AfricaKiller whales (Orcinus orca) were studied using data obtained on an opportunistic basis between 1973 and 1996 at Marion Island (46°54’S, 37°45’E) in the Southern Indian Ocean. A clear seasonal pattern of occurrence with the main peak between October and... -
Distribution and status of the desert-dwelling giraffe (Giraffa camelopardalis angolensis) in northwestern Namibia
Item type: Journal Article • Journal: African Zoology • Authors: J.T. Fennessy [AN0001] K.E.A. Leggett --- Hoanib River Catchment Study, Namibia S. Schneider --- Hoanib River Catchment Study, NamibiaThe population density and distribution of desert dwelling giraffes was estimated in three study areas in the Hoanib River catchment, northwestern Namibia. Giraffe population densities (0.01 giraffe/km2) were equal to the lowest recorded in Africa with population numbers fluctuating over... -
Field evidence for aseasonality of reproduction and colony size in the Afrotropical giant mole-rat Fukomys mechowii (Rodentia: Bathyergidae)
Item type: Journal Article • Journal: African Zoology • Authors: Alfred M. Sichilima --- Mammal Research Institute, University of Pretoria, South Africa Chris G. Faulkes --- School of Biological and Chemical Sciences, Queen Mary, U.K. Nigel C. Bennett --- Mammal Research Institute, University of Pretoria, South AfricaThe giant mole-rat, Fukomys mechowii is a cooperatively breeding subterranean mole-rat exhibiting a reproductive division of labour in which usually one, or occasionally two, females are responsible for procreation. In a field study that involved complete excavation of 32 burrow... -
Seasonal variation in diversity and abundance of understorey birds in Bunduki Forest Reserve, Tanzania: evaluating the conservation value of a plantation forest
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Chacha Werema --- Department of Zoology and Wildlife Conservation, Tanzania Kim M Howell --- Department of Zoology and Wildlife Conservation, TanzaniaPlantation forests generally support lower bird diversity than natural forests. However, in some instances the plantations have been found to provide suitable habitat for a number of bird species. In the Eastern Arc Mountains, there is limited knowledge how understorey... -
Past and present fish species recorded in the estuarine Lake Ichkeul, northern Tunisia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Shaiek --- Research Unit Ecosystems and Aquatic Resources (UR13AGRO1), National Agronomy Institute of Tunisia (INAT), Tunisia C Fassatoui --- Research Unit Ecosystems and Aquatic Resources (UR13AGRO1), National Agronomy Institute of Tunisia (INAT), Tunisia MS Romdhane --- Research Unit Ecosystems and Aquatic Resources (UR13AGRO1), National Agronomy Institute of Tunisia (INAT), TunisiaLake Ichkeul in northern Tunisia is a Ramsar site, a MAB Biosphere Reserve and a UNESCO World Heritage Site. The system is one of the most important coastal wetlands in North Africa, especially as an over-wintering area for migratory birds,... -
Riverine dominance of a nearshore marine demersal food web: evidence from stable isotope and C/N ratio analysis
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AM de Lecea --- School of Life Sciences, University of KwaZulu-Natal, South Africa AJ Smit --- School of Life Sciences, University of KwaZulu-Natal, South Africa ST Fennessy --- Oceanographic Research Institute, South AfricaThe Thukela Bank, KwaZulu-Natal, supports a diverse ecosystem and South Africa’s only prawn fishery. Oceanographic studies suggest riverine input is not important for the biology of this system, whereas biological studies suggest the contrary, with prawn catches increasing with increased... -
Distribution and seasonal abundance of large cetaceans in the Durban whaling grounds off KwaZulu-Natal, South Africa, 1972–1975
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: KP Findlay --- Mammal Research Institute Whale Unit, University of Pretoria, South Africa PB Best --- Mammal Research Institute Whale Unit, University of Pretoria, South AfricaDaily charts of the aerial search effort (432 206 nautical miles) of the Union Whaling Company and 1 099 sightings of 10 497 whales were available from 628 flights off Durban between 1972 and 1975. Densities of whales were analysed... -
Population dynamics of Xylosandrus compactus (Coleoptera: Curculionidae: Scolytinae) on Coffea canephora in the Lake Victoria Crescent agroecological zone of Uganda
Item type: Journal Article • Journal: African Zoology • Authors: James P Egonyu --- Department of Zoology, Entomology and Fisheries Sciences, Uganda Gladys Ahumuza --- National Coffee Research Institute, Uganda Isaac Ogari --- National Coffee Research Institute, UgandaWe studied the seasonal population dynamics of Xylosandrus compactus on Coffea canephora for 24 months from June 2013 to May 2015 at the National Coffee Research Institute, Mukono, Uganda. Every month, we randomly sampled 20 infested twigs from different coffee... -
Temporal and spatial fluctuations of heavy metals in Opa Reservoir, Ile-Ife, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TA Adesakin --- Department of Zoology, Nigeria AA Adedeji --- Department of Zoology, Nigeria YF Taiwo --- Natural History Museum, NigeriaThe Opa Reservoir, established for water supply to the Obafemi Awolowo University community, over the years has received direct linkage to township drains as a result of the widening and dredging of its river channels. The current study aimed at... -
Annual variation of ovarian structures of Boulengerula taitana (Loveridge 1935), a Kenyan caecilian
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: M. A. Raquet --- , , France G. J. Measey --- , , South Africa J. M. Exbrayat --- , , FranceThe Kenyan caecilian, Boulengerula taitanus inhabits a climate characterised by two distinct dry and wet seasons, and a single thermal minimum in June. It is oviparous with direct development and a remarkable dermatophagous maternal care, but the female reproductive cycle... -
Temporal dynamics and relationship between climate, limnological variables and zooplankton composition in climate-sensitive Lake Bosumtwi, Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PO Sanful --- Department of Fisheries and Water Resources, School of Natural Resources, Ghana S Aikins --- Department of Theoretical and Applied Biology, Ghana E Frempong --- Department of Theoretical and Applied Biology, Ghana RI Hall --- Department of Biology, Canada RE Hecky --- Biology Department and Large Lakes Observatory, USAThe community composition and the factors affecting seasonal and interannual dynamics of zooplankton in Lake Bosumtwi were studied biweekly at a central index station during 2005 and 2006. The lake zooplankton community was species poor. Mesocyclops bosumtwii was numerically superior... -
Assessment of water quality in selected shallow wells of Keiyo Highlands, Kenya
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Peter K. Mbaka --- Department of Civil, Construction and Environmental Engineering, Kenya John K. Mwangi --- Department of Civil, Construction and Environmental Engineering, Kenya Clement K. Kiptum --- Department of Civil and Structural Engineering, KenyaA supply of potable water is important for the sustenance of a healthy population. This study was conducted in the Keiyo Highlands, Elgeyo Marakwet County, in Kenya. The aim was to assess seasonal variation in physico-chemical and microbiological water quality... -
Seasonal and sub-seasonal oxygen and nutrient fluctuations in an embayment of an eastern boundary upwelling system: St Helena Bay
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GC Pitcher --- Fisheries Management Branch, Department of Agriculture, Forestry and Fisheries, South Africa TA Probyn --- Fisheries Management Branch, Department of Agriculture, Forestry and Fisheries, South AfricaSeasonal, sub-seasonal and spatial fluctuations in bottom dissolved oxygen (DO) were examined in St Helena Bay, South Africa’s largest and most productive embayment, between November 2013 and November 2014. Alongshore bay characteristics were assessed through comparison of variables along the... -
Seasonality in the cross section of factor premia
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Adam Zaremba --- Department of Investment and Capital Markets, PolandThis study examines the seasonality effect in the cross section of factor premia representing a broad set of stock market strategies. Using cross-sectional and time-series tests, we investigated the cross-sectional seasonality of market, value, size, momentum, quality and low-risk premia... -
Phytoplankton primary productivity seasonality and changes in a small African lake, Lake Hora-Kilole, Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: R Abate --- Aquatic Sciences, Fisheries and Aquaculture Stream, Department of Zoological Sciences, China D Kifle --- Aquatic Sciences, Fisheries and Aquaculture Stream, Department of Zoological Sciences, Ethiopia YH Gao --- School of Life Sciences and State Key Laboratory of Marine Environmental Science, ChinaThe seasonality of primary productivity by phytoplankton in relation to physico-chemical and biological variables was studied in Lake Hora-Kilole from August 2007 to May 2008. In 1989, the Mojo River was temporarily diverted to flow into the lake, which substantially... -
Reassessing the invasion of South African waters by the European shore-crab Carcinus maenas
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CA Mabin --- Centre for Invasion Biology, Department of Botany and Zoology, South Africa JRU Wilson --- Centre for Invasion Biology, Department of Botany and Zoology, South Africa JJ Le Roux --- Centre for Invasion Biology, Department of Botany and Zoology, South Africa TB Robinson --- Centre for Invasion Biology, Department of Botany and Zoology, South AfricaThe European shore-crab Carcinus maenas has been present in South Africa since 1983. Despite this species’ international reputation as a biological invader, its distribution in this region has only been considered by three outdated ‘snapshot surveys.’ The present study is... -
Analysis of bycatch in the South African midwater trawl fishery for horse mackerel Trachurus capensis based on observer data
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JR Reed --- Marine Research Institute, Department of Biological Sciences, South Africa SE Kerwath --- Marine Research Institute, Department of Biological Sciences, South Africa CG Attwood --- Marine Research Institute, Department of Biological Sciences, South AfricaThe South African midwater trawl fishery targets adult horse mackerel Trachurus capensis. The bulk of the catch is taken by a single freezer-trawler, the biggest fishing vessel operating in South African waters. As fishing takes place off the south coast... -
Contrasting hydrography and phytoplankton distribution in the upper layers of cyclonic eddies in the Mozambique Basin and Mozambique Channel
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Lamont --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa RG Barlow --- Marine Research Institute and Department of Oceanography, South AfricaHydrographic data collected in cyclonic eddies in the Mozambique Channel and Basin revealed notable differences in temperature and salinity at a depth of 100 m, the upper mixed layer, the nitracline depths, and vertical distribution of chlorophyll-a (Chl-a). Differences in... -
Intertidal mangrove boundary zones as nursery grounds for the mud crab Scylla serrata
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: DO Mirera --- Kenya Marine and Fisheries Research Institute (KMFRI), KenyaThe demand for mud crab Scylla serrata (Forsskål 1775) in the global market has increased, hence there is growing momentum to farm the species in Africa. Aquaculture production in Kenya and elsewhere in East Africa currently relies on juvenile seeds... -
Seasonal habitat requirements of Lemon Dove (Aplopelia larvata) in coastal forest: camera-trap surveys of a reclusive species
Item type: Journal Article • Journal: African Zoology • Authors: David A Ehlers Smith --- School of Life Sciences, South Africa Yvette C Ehlers Smith --- School of Life Sciences, South Africa Colleen T Downs --- School of Life Sciences, South AfricaThe modification of natural habitats requires behavioural plasticity, which may be challenging for ‘specialist’ species. Quantifying habitat requirements and behavioural responses of specialists to landscape transformation is thus a priority for baseline data to inform conservation practices. Using camera-trap surveys... -
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,... -
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... -
Spatio-seasonal dynamics of bacteria and metal composition of a platinum mine tailings dam, Rustenburg, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Molemi E Rauwane --- Agricultural Research Council–Biotechnology Platform, South Africa Laurette M Marais --- Department of Biotechnology, Faculty of Applied and Computer Sciences, Vanderbijlpark Campus, South Africa Oluwatosin G Oladipo --- Unit for Environmental Sciences and Management, South Africa Cornelius C Bezuidenhout --- Unit for Environmental Sciences and Management, South Africa Mark S Maboeta --- Unit for Environmental Sciences and Management, South AfricaSeasonal variations and proximity to polluted sites, among other factors, play a vital role in soil composition. The impact of spatio-seasonal changes on bacterial and heavy metal content on and around the platinum mine tailings dam, Rustenburg, South Africa, was... -
Population abundance and seasonal migration patterns indicated by commercial catch-per-unit-effort of hakes (Merluccius capensis and
M. paradoxus ) in the northern Benguela Current Large Marine Ecosystem Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JN Kathena --- National Marine Information and Research Centre (NatMIRC), Ministry of Fisheries and Marine Resources, Namibia D Yemane --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa N Bahamon --- Centre d’Estudis Avançats de Blanes (CEAB – CSIC), Spain T Jansen --- National Institute of Aquatic Resources (DTU Aqua), DenmarkWe developed generalised additive models (GAMs) to estimate standardised time-series of population abundance indices for assessment purposes and to infer ecological and behavioural information on northern Benguela hakes, Merluccius capensis and M. paradoxus, using haul-by-haul commercial trawl catch-rate data as... -
Biodiversity and ecology of epilithic diatoms in the Agnéby River, Ivory Coast
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: KR N’Guessan --- Laboratoire d’Hydrobiologie et d’Éco-technologie des Eaux-U.F.R, Côte d’Ivoire BRD Aboua --- Laboratoire d’Hydrobiologie et d’Éco-technologie des Eaux-U.F.R, Côte d’Ivoire J Tison-Rosebery --- Irstea-ur eabx, France A Ouattara --- Laboratoire d’Environnement et de Biologie Aquatique, UFR-Sciences et Gestion de l’Environnement, Côte d’Ivoire EP Kouamelan --- Laboratoire d’Hydrobiologie et d’Éco-technologie des Eaux-U.F.R, Côte d’IvoireThe ecology and taxonomy of the epilithic diatom flora of the Agnéby River, Ivory Coast were studied in 2012. Ten sites were investigated and diatoms were sampled on glass slides immersed for a period of 30 days during the wet... -
Effects of seasonal variation, group size and sex on the activity budget and diet composition of the addax antelope
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Hicham Seri --- Laboratoire d’Elevage et de la Faune Sauvage, Tunisia Mohsen Chammem --- Laboratoire d’Elevage et de la Faune Sauvage, Tunisia Luis MM Ferreira --- CITAB-Centre for the Research and Technology of Agro-Environment and Biological Sciences, Portugal Marwa Kechnebou --- Laboratoire d’Elevage et de la Faune Sauvage, Tunisia Touhami Khorchani --- Laboratoire d’Elevage et de la Faune Sauvage, Tunisia Severiano R Silva --- CECAV-Animal Science Department, PortugalBehaviour and diet composition are critical elements in conservation biology within the scope of reintroduction programs. Here we focused on addax (Addax nasomaculatus), a Critically Endangered antelope species, in the Jbil National Park, Tunisia. In this study, we advanced the... -
Concentrations and ecological risks of metals in surface sediments of some coastal creeks in the Niger Delta, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CMA Iwegbue --- Department of Chemistry, Nigeria OV Beecroft --- Department of Chemistry, Nigeria JE Ogala --- Department of Geology, Nigeria FE Egobueze --- Environment Department, Nigeria GO Tesi --- Department of Chemistry, Nigeria GE Nwajei --- Department of Chemistry, Nigeria BS Martincigh --- School of Chemistry and Physics, South AfricaThe concentrations of nine metals were measured by atomic absorption spectrophotometry in surface sediments of three coastal creeks, namely, the Ifie, Egbokodo and Ubeji creeks, in the Niger Delta of Nigeria, from August 2012 to January 2013. The aim of... -
Wintertime rates of net primary production and nitrate and ammonium uptake in the southern Benguela upwelling system
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RF Flynn --- Department of Oceanography, South Africa JM Burger --- Department of Oceanography, South Africa K Pillay --- Branch: Oceans and Coasts, Department of Environmental Affairs (DEA), South Africa SE Fawcett --- Department of Oceanography, South AfricaThe elevated levels of primary productivity associated with eastern boundary currents are driven by nutrient- rich waters upwelled from depth, such that these regions are typically characterised by high rates of nitrate-fuelled phytoplankton growth. Production studies from the southern Benguela... -
Changes in bat community composition and activity patterns across a conservation-agriculture boundary
Item type: Journal Article • Journal: African Zoology • Authors: Fezile Mtsetfwa --- Department of Wildlife Ecology and Conservation, School of Natural Resource and Environment, United States Robert A McCleery --- Department of Wildlife Ecology and Conservation, School of Natural Resource and Environment, United States Ara Monadjem --- Department of Wildlife Ecology and Conservation, School of Natural Resource and Environment, United StatesAgricultural landscapes are typically associated with a decreased biodiversity, particularly when they extend across large spatial scales. Despite the fact that some African bat species seem to provide essential ecosystem services across landscapes, we only have a limited understanding of... -
Strategies and Technologies for Camel Milk Preservation and Utilization of Non-Marketed Milk in Arid and Semi-Arid Areas
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: Jackline Akinyi Ogolla --- University of Kassel. Faculty of Organic Agriculture. Department of Agricultural & Bio- systems Engineering, Germany Christian Dede --- University of Kassel. Faculty of Organic Agriculture. Department of Agricultural & Bio- systems Engineering, Germany Michael Wandayi Okoth --- University of Nairobi. College of Agriculture and Veterinary Sciences. Department of Food Science, Nutrition and Technology, Kenya Oliver Hensel --- University of Kassel. Faculty of Organic Agriculture. Department of Agricultural & Bio- systems Engineering, Germany Barbara Sturm --- University of Kassel. Faculty of Organic Agriculture. Department of Agricultural & Bio- systems Engineering, GermanyThis study determined the seasonal fluctuations in camel milk yield, consumption, spoilage and spillages, and explored its forms of consumption and the acceptability of camel milk powder in Isiolo County, Kenya. In addition, the utilization of non-marketed milk, preservation technologies,... -
Food profile of Grey Wagtail Motacilla cinerea during an annual cycle in the Algerian Babors Mountains of North Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Roza Belkacem --- Laboratoire de Zoologie Appliquée et d’Écophysiologie Animale, Faculté des Sciences de la Nature et de la Vie, Algeria Abdelazize Franck Bougaham --- Laboratoire de Zoologie Appliquée et d’Écophysiologie Animale, Faculté des Sciences de la Nature et de la Vie, Algeria Mohammed Gagaoua --- Université Clermont Auvergne, France Riadh Moulaï --- Laboratoire de Zoologie Appliquée et d’Écophysiologie Animale, Faculté des Sciences de la Nature et de la Vie, AlgeriaThis study showed from the analysis of 180 droppings of the Grey Wagtail Motacilla cinerea harvested during a period of one year from the Babors Mountains (Bejaia, Algeria) that insects formed the main part of the diet (85.9% of identified... -
Montane forest birds in winter: do they regularly move to lower altitudes? Observations from the Eastern Cape, South Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Adrian JFK Craig --- Department of Zoology and Entomology, South Africa Patrick E Hulley --- Department of Zoology and Entomology, South AfricaSeasonal altitudinal migration to lower altitudes including the coast has been ascribed to a number of forest birds, of which 14 species occur at Fort Fordyce Reserve in the Eastern Cape, South Africa. Based on our observations and ringing at... -
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... -
Spatial and temporal variation in the use of supplementary food in an obligate termite specialist, the bat-eared fox
Item type: Journal Article • Journal: African Zoology • Authors: Keafon R Jumbam --- Department of Zoology and Entomology, South Africa Stéphanie Périquet --- Department of Zoology and Entomology, South Africa Fredrik Dalerum --- Research Unit of Biodiversity, Spain Aliza le Roux --- Department of Zoology and Entomology, South AfricaThe bat-eared fox (Otocyon megalotis) is considered a termite specialist. However, studies of its diet have been limited to indirect methods, such as scat and stomach content analyses, resulting in intraspecific dietary variations due in part to methodological differences. Because... -
Prevalence of Kudoa thyrsites (Myxozoa) in South African sardine Sardinops sagax, kingklip Genypterus capensis, and Cape hakes Merluccius capensis and M. paradoxus
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SS Henning --- Department of Food Science and Technology, South Africa M Krügel --- Department of Food Science, South Africa M Manley --- Department of Food Science, South AfricaPrevalence of infection with the myxozoan parasite Kudoa thyrsites is not well documented in sardine Sardinops sagax, the Cape hakes Merluccius capensis and M. paradoxus, and kingklip Genypterus capensis. Quantitative polymerase chain reaction assays were used to determine the prevalence... -
Diet of Glossogobius callidus (Teleostei: Gobiidae) in freshwater impoundments in the Sundays River Valley of the Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: L Mofu --- Department of Ichthyology and Fisheries Science, South Africa DJ Woodford --- Centre for Invasion Biology, School of Animal, Plant and Environmental Sciences, South Africa RJ Wasserman --- South African Institute for Aquatic Biodiversity, South Africa T Dalu --- South African Institute for Aquatic Biodiversity, South Africa OLF Weyl --- Department of Ichthyology and Fisheries Science, South AfricaDespite the high abundance of the gobiid fish Glossogobius callidus in many freshwater ecosystems in South Africa, very few studies have assessed the biology and ecology of the species. Here, we investigated the diet of G. callidus populations sourced from... -
Reproductive biology of the mackerel scad Decapterus macarellus from Cabo Verde and the implications for its fishery management
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MPV Costa --- Instituto Nacional do Desenvolvimento das Pescas [National Institute for Fisheries Development ] (INDP), Cabo Verde DRS Cruz --- Faculty of Sciences of the University of Lisbon, Portugal LS Monteiro --- Federal University of Rio Grande, Brazil KSM Evora --- University of Cabo Verde, Cabo Verde LG Cardoso --- Federal University of Rio Grande, BrazilThe mackerel scad Decapterus macarellus is of great social and economic importance to Cabo Verde citizens; however, in recent years catches have shown an unexplained decline. The harvest is regulated by way of a minimum legal size and a seasonal... -
Spatial variability of aquatic macroinvertebrate assemblages in the Okavango Delta, Botswana: considerations for developing a rapid bioassessment tool
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: H Dallas --- , South Africa B Mosepele --- , BotswanaSpatial variability in macroinvertebrate assemblages of the Okavango Delta, Botswana, was examined to evaluate differences in assemblages at a regional and habitat scale. Sampling was undertaken six times during a one-year cycle from 2005 to 2006, with 228 macroinvertebrates samples... -
Annual litter production in a Brazilian Cerrado woodland savanna
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Alan N Costa --- , Brazil Alessandra Bartimachi --- , Brazil Heraldo L Vasconcelos --- , USA Emilio M Bruna --- , USA Ernane HM Vieira-Neto --- , USAThe Brazilian Cerrado is a heterogeneous ecosystem where annual woody-layer litter production shows strong spatiotemporal variation. Although Cerrado litter dynamics have been well-documented in forest physiognomies, knowledge from savanna habitats remains limited despite their predominance across the landscape. In this... -
Numbers of invasive House Sparrows Passer domesticus in a rural landscape of Limpopo province, South Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Cavin T Shivambu --- , South Africa Ndivhuwo Shivambu --- , South Africa Takalani Nelufule --- , South Africa Moleseng C Moshobane --- , South Africa Manqoba M Zungu --- , South Africa Colleen T Downs --- , South AfricaThe House Sparrow Passer domesticus is recognised as one of the commonest avian invasive species globally, with its occurrence associated with human existence. However, relatively little on population sizes of this species in rural landscapes has been documented. The study... -
Host selection and notes on the distribution of Chonopeltis australis Boxshall, 1976 in southern Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LAM Neethling --- , South Africa A Avenant-Oldewage --- , South AfricaThe parasite Chonopeltis australis Boxshall, 1976 has been recorded from tributaries of the Orange-Vaal River System. It is host-specific, preferring the cyprinids Labeo capensis (Smith, 1841) and Labeo umbratus (Smith, 1841). Sampling was conducted between spring 2016 and autumn 2019... -
Intercolony health evaluation of wild African penguins Spheniscus demersus, in relation to parasites, along the southwest coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MPA Espinaze --- , South Africa C Hui --- , South Africa L Waller --- , South Africa S Matthee --- , South AfricaClinical parameters of African penguins Spheniscus demersus have been recorded mostly from birds admitted to rehabilitation centres and are typically presented as mean values across a region. It is uncertain whether these values are representative of wild penguins and whether... -
Interannual variation in metal concentrations in surface waters of the Marico River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Pienaar --- , South Africa V Wepener --- , South Africa CT Wolmarans --- , South AfricaThis study was conducted to establish the interannual variation in the concentration of metals regarded as toxic to aquatic fauna in the Marico River of South Africa. Five surveys were conducted between 2013 and 2015 at six sites in the... -
Modelling continental range shift of the African elephant (Loxodonta africana) under a changing climate and land cover: implications for future conservation of the species
Item type: Journal Article • Journal: African Zoology • Authors: Sintayehu W Dejene --- , Ethiopia Kudzai S Mpakairi --- , Rajapandian Kanagaraj --- , Germany Yussuf A Wato --- , Kenya Sewnet Mengistu --- , EthiopiaClimate and land use change are anticipated to alter the distribution of wildlife, due to their impact on the quantity and quality of forage availability, water cycle, as well as competition for key resources. Using an ensemble of species distribution... -
Reproduction, sexual dimorphism and predation in Mochlus sundevallii in southern Africa (Reptilia: Sauria, Scincidae)
Item type: Journal Article • Journal: African Zoology • Authors: Joaquín Verdú Ricoy --- , South Africa Phomolo Mashinini --- , South Africa Jacqueline Goedhals --- , South Africa Neil Heideman --- , South AfricaThe skink Mochlus sundevallii is widespread throughout the African continent, but no detailed research on its ecology, reproduction and sexual dimorphism patterns has been performed yet. Here we address phenotypic and ecological data of M. sundevallii from the southernmost part... -
Carbon production from seasonal litterfall in the Brazilian Atlantic Forest
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Greyce CB Maas --- , Brazil Carlos R Sanquetta --- , Brazil Renato Marques --- , Brazil Sebastião do A Machado --- , Brazil Mateus NI Sanquetta --- , Brazil Ana Paula D Corte --- , Brazil Iara M Barberena --- , BrazilForests play an important role in climate change, acting as a source or sink of carbon. There is, however, a lack of data regarding the carbon production from litterfall in tropical forests. The Atlantic Forest is one of the most... -
Phytoplankton community structure in relation to physico-chemical factors in a tropical soda lake, Lake Shala (Ethiopia)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Solomon Wagaw --- , Ethiopia Seyoum Mengistou --- , Ethiopia Abebe Getahun --- , EthiopiaPhytoplankton communities responses to physico-chemical factors were studied in Lake Shala from January to December 2018. Distinct spatial and seasonal variations were observed for all physico-chemical parameters, except DO (ANOVA: p < 0.05). In total, 72 taxa, Bacillariophyta (55 taxa),... -
Seasonal variation in water quality, plankton diversity and microbial load of tropical freshwater lakes in Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Ihuoma N Anyanwu --- , Nigeria Confidence A Ezema --- , Nigeria Sowechi Ebi --- , Nigeria Chinyere A Nwajiuba --- , Nigeria Okoro Nworie --- , Nigeria Chioma O Anorue --- , NigeriaSeasonal changes significantly affect tropical ecosystems; hence, verification of how these changes affect water quality is important for waterbodies that serve as water and food sources, particular as such changes are often associated with shifts in plankton diversity and microbial... -
Temperature cycles beneath, and adjacent to, intertidal boulders and associated differences in biotic composition
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C van Rensburg --- , South Africa A Robbins --- , South Africa C Griffiths --- , South AfricaThe only previous study on the macrobiota of South African boulder shores showed this assemblage to be more diverse than on nearby rocky platforms, but the drivers of that difference remain unresolved. We recorded water and air temperatures under intertidal... -
Woody cover change in relation to fire history and land-use in the savanna-woodlands of north-east Namibia (1996–2019)
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Glynis Humphrey --- , South Africa Conor Eastment --- , South Africa Lindsey Gillson --- , South Africa M Timm Hoffman --- , South AfricaVegetation cover estimates for trees, shrub-grass mosaics, and grassland and bare ground, were quantified in the savanna-woodland of Bwabwata National Park, north-east Namibia. Changes in woody cover were analysed using repeat photographs in combination with aerial photographs and recent satellite... -
Estimating the economic income and social contributions derived from the South African west coast rock lobster fishery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JM Eggers --- Rhodes University, South Africa KL Cochrane --- Rhodes University, South Africa WHH Sauer --- Rhodes University, South AfricaThe west coast rock lobster Jasus lalandii fishery is South Africa’s third-most-valuable fishery, although the stock is currently estimated at <2% of its pristine biomass. Recent ecologically necessary reductions in the total allowable catch (TAC) had negative economic impacts on... -
Aspects of the nonbreeding ecology of the Tree Pipit Anthus trivialis in and around Amurum Forest Reserve, Jos Plateau, Nigeria
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Taiwo A Adams --- University of Jos Biological Conservatory, Nigeria Samuel T Ivande --- University of Jos Biological Conservatory, Nigeria Mark Wilson --- , United KingdomTo advance our knowledge about the nonbreeding ecology of the Tree Pipit Anthus trivialis, this study investigated its population dynamics, habitat utilisation and foraging behaviour, from October to December 2018, in and around the Amurum Forest Reserve, located in the... -
Forage yield and quality response of Napier grass (Cenchrus purpureus) to different dry season harvesting management under the subhumid agroecology of western Ethiopia
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Abuye Tulu --- Oromia Agricultural Research Institute, Ethiopia Mekonnen Diribsa --- Oromia Agricultural Research Institute, Ethiopia Worku Temesgen --- Oromia Agricultural Research Institute, EthiopiaA 3 × 2 factorial study was conducted in 2015, 2016 and 2017, to assess the impact of dry season cutting management on fodder yield and quality of Napier grass. Three harvesting times (November, January and March) and two stubble-... -
Status of diversity, abundance and seasonal variations of gill net catches of cichlids in Lake Bosumtwi, Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Asase --- University of Ghana, Ghana TL Lauridsen --- Aarhus University, Denmark PO Sanful --- University of Energy and Natural Resources, Ghana EEK Quansah --- University of Ghana, Ghana FKE Nunoo --- University of Ghana, GhanaThe cichlids in Lake Bosumtwi are under increasing pressure with a recent build-up in local fishing pressure. This study was conducted to assess the status and seasonal catch rates of fish species using gillnets over a two-year period. Four species... -
Patterns in sightings of ocean sunfishes (Molidae) in the greater Dyer Island ecosystem, Western Cape, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RGA Watson --- , South Africa E Frey --- Queen’s University, Canada S Hörbst --- , South AfricaThis study aims to describe the distribution of ocean sunfishes (family Molidae) in the greater Dyer Island ecosystem off the southwest coast of South Africa. Between 2014 and 2022, local whale watching vessels operating under Dyer Island Cruises conducted 3... -
Dynamics of tall fescue (Festuca arundinacea) and Kikuyu grass (Cenchrus clandestinus) pastures associated with white clover (Trifolium repens) in small-scale dairy systems in the highlands of central Mexico
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: --- Instituto de Ciencias Agropecuarias y Rurales (ICAR), Universidad Autónoma del Estado de México (UAEM), México --- Instituto de Ciencias Agropecuarias y Rurales (ICAR), Universidad Autónoma del Estado de México (UAEM), México --- , México --- Instituto de Ciencias Agropecuarias y Rurales (ICAR), Universidad Autónoma del Estado de México (UAEM), MéxicoAn on-farm participatory study was undertaken to assess changes over seasons on the availability, botanical and morphological composition, and nutritive value of herbage from two pastures in small-scale dairy systems in the highlands of central Mexico. One pasture (TF-33) was... -
Wing-moult and seasonal occurrence of sunbirds (Nectariniidae) captured at four sites in the Eastern Cape, South Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Bo T Bonnevie --- Rhodes University, South Africa Adrian JFK Craig --- Rhodes University, South Africa Pat E Hulley --- Rhodes University, South Africa Albert Schultz --- , South Africa Anthony J Tree --- Rhodes University, South AfricaRinging activity in the Eastern Cape province, South Africa, spanned 30 years, with three sites active concurrently over a 14-year period, and three sites over a 6-year period. In total, in the course of 714 ringing days, in all months,... -
Plumage dimorphism and moult patterns of weaverbirds – a review
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: H-Dieter Oschadleus --- University of KwaZulu-Natal, South Africa Staffan Andersson --- University of Gothenburg, SwedenThe colourful plumages of weaverbirds (family Ploceidae, with 118 species recognised) provide a well-known and in part iconic showcase of sexual selection, with widespread sexual dimorphism (93 species) as well as seasonal dimorphism (62 species). The tremendous diversity in both... -
A demonstration of the value of recapture data for informing moult phenology models for avian species with imperfect moult data
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Philipp H Boersch-Supan --- , United Kingdom Alan Tristram Kenneth Lee --- University of Cape Town, South Africa Hans-Dieter Oschadleus --- University of KwaZulu-Natal, South AfricaThe Underhill–Zucchini model has revolutionised the study of moult in the context of birds’ annual cycles, but, as for all statistical models, inferences are vulnerable to violations of model assumptions. In particular, the standard Underhill–Zucchini models for moult phenology are... -
Seasonal distribution of livestock in Samburu county, northern Kenya: a response to variable pasture and water in semi-arid rangelands
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: GL Lelenguyah --- Animal Health and Industry Training Institute, Kenya MM Nyangito --- University of Nairobi, Kenya OV Wasonga --- University of Nairobi, Kenya RC Bett --- University of Nairobi, KenyaSpatial and temporal climate variability dictate herd mobility of transhumant communities, and therefore understanding this interrelationship is key to sustainable management of rangelands, especially in the face of the changing climate. This study was undertaken in Samburu county in Kenya,... -
Cape genet Genetta tigrina diet in the Albany Thicket Biome, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Axola Plaatjie --- University of Fort Hare, South Africa Filipe Carvalho --- University of Fort Hare, South Africa Rabelani Marikhele --- University of the Witwatersrand, South Africa Zimkitha JK Madikiza --- University of the Witwatersrand, South Africa Emmanuel Do Linh San --- University of Fort Hare, South AfricaThe diet of the Cape genet Genetta tigrina is only well known in the coastal forests of South Africa, where either arthropods or small mammals are their dominant prey. Here, we aimed to demonstrate this species’ opportunistic behaviour by investigating... -
Spatial and seasonal variation of microplastics and surface water quality of the Njoro River and Lake Nakuru ecosystems, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Petra Kienyiy Chui --- Egerton University, Kenya Bernard Kibet Kirui --- Egerton University, Kenya Meshack Amos Obonyo --- Egerton University, KenyaHigh levels of plastic pollutants threaten aquatic habitats as the plastic materials are ingested by aquatic organisms as food. This study assessed seasonal variations of microplastics and the water quality of the Njoro River and Lake Nakuru, Kenya. Selected water... -
Greenhouse gas concentrations in tropical wetlands of the Cross River estuary, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AB Andem --- University of Calabar, Nigeria OB Ojo --- University of Calabar, Nigeria RA Odey --- University of Calabar, Nigeria GE Eni --- University of Calabar, Nigeria OR Ibor --- University of Calabar, Nigeria IA Iwara --- University of Calabar, Nigeria VO Eyo --- Nigerian Maritime University, NigeriaThe Cross River estuary is a coastal wetland in the south-eastern part of the Niger Delta region of Nigeria with its hydrological cycle largely dependent on precipitation. The purpose of this study was to determine the greenhouse gas (GHG) concentrations... -
Size structure and reproductive biology of skipjack tuna Katsuwonus pelamis and kawakawa Euthynnus affinis in the western Indian Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: FA Mzingirwa --- Rhodes University, South Africa GM Okemwa --- Kenya Marine and Fisheries Research Institute (KMFRI), Kenya MW Farthing --- Rhodes University, South Africa CS Bova --- Rhodes University, South Africa JS Halafo --- Instituto Oceanográfico de Moçambique (InOM), Mozambique JG Mshana --- Sokoine University of Agriculture, Tanzania AA Abubakar --- Kenya Marine and Fisheries Research Institute (KMFRI), Kenya N Ishmael --- Kenya Marine and Fisheries Research Institute (KMFRI), Kenya WHH Sauer --- Rhodes University, South AfricaSkipjack tuna Katsuwonus pelamis and kawakawa Euthynnus affinis are economically important tuna species targeted by artisanal fishers in the western Indian Ocean. Both species are currently considered sustainably fished despite substantial catches. Even so, ongoing management is crucial to maintain... -
Influence of spatio-temporal variations in precipitation and temperature on the productivity of Eastern Lake Kyoga, Uganda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: John Peter Obubu --- African Centre of Excellence for Water Management, Addis Ababa University, Ethiopia Robinson Odong --- Entomology and Fisheries Sciences, Makerere University, Uganda Seyoum Mengistou --- African Centre of Excellence for Water Management, Addis Ababa University, Ethiopia Tadesse Fetahi --- African Centre of Excellence for Water Management, Addis Ababa University, Ethiopia Tena Alamerew --- Ethiopian Institute of Water Resource, Addis Ababa University, Ethiopia Ekwacu Samuel --- Uganda National Meteorological Authority, UgandaSpatio-temporal variations in precipitation and temperature affect productivity in aquatic systems, mainly through nutrient dynamics. Shallow lakes are more vulnerable to spatio-temporal variations, yet they are an important resource for biodiversity conservation, water supply and fisheries. The eastern arm of... -
First report of Dactylogyrus fimbriphallus (El Gharbi, Birgi & Lambert, 1994) infecting Luciobarbus biscarensis (Boulenger, 1911) in Oued Tadmit River of Djelfa Governorate (Algeria)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Djouhina Chabira --- University of Biskra, Algeria Badreddine Attir --- University of Biskra, Algeria Nurten Aydoğdu --- Balıkesir University, Türkiye Adel Mammeri --- University of Biskra, AlgeriaThis study aimed to determine the occurrence of dactylogyrid communities in Sahara barbel, Luciobarbus biscarensis (Boulenger, 1911), an endemic species to Algeria, according to season and host factors. A total of 78 samples of L. biscarensis were collected seasonally, over... -
Forecasting oil futures markets using machine learning and seasonal trend decomposition
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Ahhyun Kim --- Sungkyunkwan University, Korea Doojin Ryu --- Sungkyunkwan University, Korea Alexander Webb --- University of Wollongong, AustraliaCan machine learning improve prediction for seasonal commodity prices? We explore the effectiveness of a combined method that integrates seasonal trend decomposition using LOESS (STL) with machine learning (ML), referred to as STL-ML. We apply Extreme Gradient Boosting and Random... -
Long-term temporal patterns of human-carnivore conflict in the Chobe Enclave, northern Botswana
Item type: Journal Article • Journal: African Zoology • Authors: Gosiame Neo-Mahupeleng --- Botswana University of Agriculture and Natural Resources, Botswana Richard Fynn --- Okavango Research Institute, University of Botswana, Botswana Moseki Ronald Motsholapheko --- Okavango Research Institute, University of Botswana, Botswana Matshelo Makondo --- , Botswana Kaelo Nkile --- , Botswana Reneilwe Dipheko --- , Botswana Graham IH Kerley --- Centre for African Conservation Ecology, Nelson Mandela University, South AfricaIn some areas, human and carnivore livelihoods overlap causing human-carnivore conflict (HCC), hence there is a need for carnivore conservation efforts. The decline of most large carnivore populations are linked to HCC, primarily due to the killing of carnivores by... -
Spatial environmental variability shapes the diversity of bottom ecosystems on the western Gulf of Guinea shelf
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C Denechaud --- Institute of Marine Research (IMR), Norway E Dovlo --- Fisheries Scientific Survey Division (FSSD), Ghana T Joanny --- Centre de Recherches Océanologiques (CRO), Côte d’Ivoire VS Osei --- Fisheries Scientific Survey Division (FSSD), Ghana L Buhl-Mortensen --- Institute of Marine Research (IMR), Norway A Staby --- Institute of Marine Research (IMR), NorwayThe western Gulf of Guinea is characterised by seasonal upwellings and hosts a large diversity of marine species. Although the assemblages of bottom fishes and benthic organisms are periodically assessed, there has been little research investigating these in tandem. We... -
Seasonal effects on surface water quality in the Awetu River, Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Mohammedsalih Kadir Gobana --- Jimma University, Ethiopia Alemayehu Haddis Getahun --- Jimma University, Ethiopia Dessalegn Dadi Olani --- Jimma University, EthiopiaUnderstanding the impact of seasonal variation on surface water provides a better understanding of pollution dynamics and the implementation of sustainable water-use and management strategies. The objective of this study was to assess the impact of seasonal variation on surface... -
Growth patterns and condition index of rock oysters Saccostrea cucullata in relation to river influence in southeastern Madagascar
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Masimana --- Institut d’Enseignement Supérieur d’Anôsy, Université de Toliara, Madagascar A Andrisoa --- Aix-Marseille University, CNRS, IRD, INRAE, CEREGE, FranceSaccostrea cucullata is the dominant species of rock oyster (family Ostreidae) in southeastern Madagascar. Despite its economic and ecological importance, information on its biology and ecology is scarce. This study investigated the growth, shell length–weight relationship, and condition index (tissue... -
Seasonality in the events industry: A case study of two event venues in Amsterdam
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Cathelijne de Jong --- NHL Stenden University of Applied Sciences, The Netherlands Rodney Westerlaken --- NHL Stenden University of Applied Sciences, The NetherlandsThis study aims to expand academic understanding of seasonality by establishing if previous scholarly work on the subject is also applicable to the novel context of the urban event industry. A mixed-method approach combining qualitative and quantitative research was applied,... -
Distribution and movement patterns of white musselcracker Sparodon durbanensis, a South African endemic seabream
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BQ Mann --- Oceanographic Research Institute (ORI), South Africa GL Jordaan --- Oceanographic Research Institute (ORI), South Africa R Daly --- Oceanographic Research Institute (ORI), South Africa WN Dalton --- Oceanographic Research Institute (ORI), South Africa PA Watt-Pringle --- Oceanographic Research Institute (ORI), South Africa K Hewett --- Rhodes University, South Africa WM Potts --- Rhodes University, South AfricaThe white musselcracker Sparodon durbanensis (family Sparidae) is a highly prized shore angling and spearfishing species. This study investigated its movement behaviour along the southeastern seaboard of South Africa, using tag-recapture data. A total of 3 378 S. durbanensis were... -
Simulated rangeland conditions and seasonal variations influence soil quality in semi-arid central South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: JDJ Marx --- University of the Free State, South Africa E Kotzé --- University of the Free State, South Africa JJ van Tol --- University of the Free State, South Africa PF Loke --- University of the Free State, South AfricaThe study examined long-term effects of rangeland conditions and seasonal variations on soil quality without confounding grazing effects. Samples were collected seasonally from good, moderate, poor, bare and cultivated rangeland conditions at soil depths of 0–10 cm and analysed for... -
Residency, site affinity and coastal movements of the southern African endemic spotted gully shark Triakis megalopterus
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: E Cottrant --- South African Shark Conservancy, South Africa JH Morrison --- South African Shark Conservancy, South Africa C Elston --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa TS Murray --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa NJ Drobniewska --- South African Shark Conservancy, South Africa LG Underhill --- Department of Biological Sciences, University of Cape Town, South Africa N Hammerschlag --- Rosenstiel School of Marine, Atmospheric, and Earth Science, University of Miami, United States PS Albano --- Rosenstiel School of Marine, Atmospheric, and Earth Science, University of Miami, United States ME McCord --- South African Shark Conservancy, South Africa PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa C Fallows --- Apex Shark Expeditions, South Africa TG Paulet --- South African Shark Conservancy, South AfricaRising global concern regarding the conservation and management of shark species makes it essential to identify key ecological species to guide conservation efforts, especially species with more restricted distributions such as endemic species. The southern African endemic spotted gully shark...