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Optimising stocking rate under commercial and subsistence pastoralism optimisering van veelading by kommersiele en bestaansveeboerdery
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: M.T. Mentis --- Department of Grassland Science,Hopes for a single criterion of overstocking are forlorn. Livestock may be kept for any of many purposes, and the stocking rate optimal for one is not necessarily so for another. Conflicts might be resolved by (1) recognising the likely... -
Nitrogen mineralization, nitrification and nitrogen balance in laboratory incubation of soil from natural grassland in the central Orange Free State
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.H. Wiltshire --- Department of Soil Science, Republic of South AfricaAir-dried soil from three layers under grassveld was moistened by the addition of 12 levels of water and incubated for up to two years at five temperatures in screw-capped preserving jars with an air-filled head- space equivalent to seven times... -
NUTRIENTS AND THE PRODUCTIVITY OF ESTUARINE AND COASTAL MARINE ECOSYSTEMS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: S.W. Nixon --- Marine Ecosystems Research Laboratory, United States of America C.A. Oviatt --- Marine Ecosystems Research Laboratory, United States of America J. Frithsen --- Marine Ecosystems Research Laboratory, United States of America B. Sullivan --- Marine Ecosystems Research Laboratory, United States of AmericaRecent research on estuarine and coastal marine systems has revealed two particularly interesting things about nutrients and productivity. First is the observation that these areas are among the most intensively fertilized environments on earth. Second is the common finding that... -
A RULE-BASED ECOSYSTEM MODEL FOR THE MANAGEMENT OF LAKE ST LUCIA
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: R.H. Taylor --- Natal Parks Board, South Africa B.P. Farm --- Dept. of Ecology and Behavioural Biology, United States of America A.M. Starfield --- Dept. of Ecology and Behavioural Biology, United States of AmericaLand transformations in the catchments of Lake St Lucia have altered the hydrology of the system and increased management is now needed to counteract these changes. There are several management options available, but prior to implementing them we must be... -
DEEP SEA, ESTUARINE AND FRESHWATER FISHES: LIFE HISTORY STRATEGIES AND ECOLOGICAL BOUNDARIES
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: S. J.M. Blaber --- Division of Fisheries, AustraliaThe life histories of fishes from three different ecosystems are compared and discussed with emphasis on species that move between habitats: between estuary and sea in tropical northern Australia; between bottom waters and pelagic waters of the temperate continental slope... -
COASTAL AQUATIC ECOSYSTEMS, CONSERVATION AND MANAGEMENT STRATEGIES IN NIGERIA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: E.A. Ajao --- , NigeriaThe coastal ecosystems in Nigeria are classified into four broad regions according to differences in general morphology, vegetation and beach type. They are the barrier lagoon complex, the transgressive mud beach, the Niger delta and the strand coast. The delta... -
THE EFFECTS OF TROUT-FARM EFFLUENTS ON BENTHIC INVERTEBRATE COMMUNITY STRUCTURE IN RIVERS IN THE SOUTH-WESTERN CAPE, SOUTH AFRICA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: C.A. Brown --- Freshwater Research Unit, Zoology Department, J.M. King --- Freshwater Research Unit, Zoology Department,The south-western Cape is currently responsible for 45% of the total annual trout production in South Africa and further expansion of this industry in the region is likely. A preliminary survey of seven trout farms situated on the upper reaches... -
FURTHER COMMENT ON THE RESPONSE OF EASTERN CAPE PROVINCE ESTUARIES TO VARIABLE FRESHWATER INFLOWS
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: B.R. Allanson --- , South Africa G. H.L. Read --- , South AfricaRiver flow patterns in the Kariega, Great Fish and Keiskamma estuaries, South Africa are examined to assess the impact variation in flow has upon the delivery of inorganic nutrients, total organic carbon, primary productivity and the heterotrophic components, bacteria and... -
Production and decomposition of plant litter in an arid rangeland of Kenya
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: WN Ekaya JI KinyamarioData on litter production and decomposition in an arid rangeland in Kenya was collected over a two-year period. Utter sampling was carried out at monthly intervals using a rectangular 0.25m−2 quadrat frame. Utter within the quadrats was handpicked and washed... -
Lines around fragments: effects of fencing on large herbivores
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: RandallB Boone N Thompson HobbsPeople construct fences to delineate land ownership and to control access to land. Fences accomplish several purposes, notable among these are containing livestock or wildlife raised for profit or subsistence, excluding use of vegetation within areas to be conserved and... -
The Ellis paradigm — humans, herbivores and rangeland systems
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Michael CoughenourThe scientific and conceptual contributions Jim Ellis made throughout the course of his career reveal a logical progression towards increased understanding of pastoral ecosystems worldwide. Research in wildlife, large herbivores, systems ecology and energy flows through grazing ecosystems formed the... -
Community dynamics and phytomass of herbaceous species in the Sudaniansavanna-woodlands of Burkina Faso: short-term impact of burning season
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: SD Dayamba --- Tropical Silviculture and Seed Laboratory, Southern Swedish Forest Research Centre, Faculty of Forest Sciences, Sweden P Savadogo --- Tropical Silviculture and Seed Laboratory, Southern Swedish Forest Research Centre, Faculty of Forest Sciences, Sweden L Sawadogo --- Département Productions Forestières, Burkina Faso D Tiveau --- , République Démocratique du Congo D Zida --- Département Productions Forestières, Burkina Faso M Tigabu --- Tropical Silviculture and Seed Laboratory, Southern Swedish Forest Research Centre, Faculty of Forest Sciences, Sweden PC Oden --- Tropical Silviculture and Seed Laboratory, Southern Swedish Forest Research Centre, Faculty of Forest Sciences, SwedenFire is important for the maintenance and conservation of African savanna ecosystems, and prescribed fire is used in the Sudanian savanna-woodlands of West Africa as a forest management tool. Yet, the effects of fire on savanna ecosystems and especially on... -
Water policy in southern Africa: A brief synopsis of some of the macro driving forces
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AR TurtonThe water sector reforms that are underway in many parts of southern Africa are a manifestation of a global phenomenon. This is rooted in the human response to the undesirable consequences of development, and seeks to introduce the notion of... -
Beacons in the limnological landscape
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BR AllansonAn overview is given of a number of major developments in the limnology of South Africa, Zimbabwe and Namibia. None was possible without the involvement of enthusiastic investigators who, over some 70 years, stimulated the growth of freshwater research in... -
The impact of dredging on macrobenthic invertebrates in a tributary of the Warri River, Niger delta
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: EI Ohimain TOT Imoobe MO Benka-CokerThe macrobenthic invertebrates of a canal, created from a tributary of the Warri River in the mangrove swamp of the Niger Delta, Nigeria, were studied before and after dredging. In the canal dredging resulted in at least a 93% decrease... -
Application of the Indicators of Hydrological Alteration method to the Mkomazi River, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: V Taylor --- , South Africa R Schulze --- , South Africa G Jewitt --- , South AfricaHydrological regimes play a major role in structuring the biotic diversity within river ecosystems and hydrological variation is recognised as a primary driving force within those ecosystems. The US Nature Conservancy developed a method known as the Indicators of Hydrological... -
Water quality impacts on instream biota of the Shingwedzi River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PSO Fouche --- Department of Zoology, South Africa W Vlok --- Department of Zoology, South AfricaWater quality, macroinvertebrate diversity (using SASS5) and fish diversity (using the fish response assessment index) of the Shingwedzi River system were monitored in 2007/2008 to determine the present status of the system. Possible water pollution sources were identified by aerial... -
Pesticides in South African fresh waters
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TM Ansara-Ross --- Centre for Aquatic Research, Department of Zoology, South Africa V Wepener --- Centre for Aquatic Research, Department of Zoology, South Africa PJ van den Brink --- Department of Aquatic Ecology and Water Quality Management, The Netherlands MJ Ross --- Centre for Aquatic Research, Department of Zoology, South AfricaPublic concern has recently escalated over pesticide contamination of South African aquatic ecosystems. This review of published literature on the occurrence of pesticides within South African freshwater systems indicates that fewer than 50 studies of selected pesticides have been undertaken,... -
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... -
South African ecotoxicology — present status and future prognosis
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: V Wepener --- Water Research Group, School of Environmental Sciences and Development, South Africa PM Chapman --- , CanadaToxicology studies the interactions of a chemical substance with individual organisms, whereas ecotoxicology is a multidisciplinary approach incorporating ecology and other disciplines, e.g. chemistry, microbiology, etc., to determine responses of individuals, populations and whole ecosystems to stressors such as chemicals... -
Health of sharptooth catfish Clarias gariepinus in Pongolapoort Dam, South Africa: a comprehensive study
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: KJ McHugh --- Centre for Aquatic Research, South Africa NJ Smit --- Water Research Group (Ecology), Unit for Environmental Sciences and Management, South Africa JHJ van Vuren --- Centre for Aquatic Research, South Africa JC van Dyk --- Centre for Aquatic Research, South AfricaA histology-based fish health assessment protocol was used in 2009–2010 to assess the health status of Clarias gariepinus from Pongolapoort Dam, South Africa. Nineteen fish were collected by angling. The histology of liver, kidney, gills and testes or ovaries was... -
Relationship between water temperature predictability and aquatic macroinvertebrate assemblages in two South African streams
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BR Eady --- Discipline of Geography, School of Agricultural, Earth and Environmental Sciences, South Africa NA Rivers-Moore --- Centre for Water Resources Research, South Africa TR Hill --- Discipline of Geography, School of Agricultural, Earth and Environmental Sciences, South AfricaVariable seasonal stream temperatures are a critical factor in maintaining aquatic invertebrate community patterns. We investigated whether the degree of predictability in a stream's water temperature profile provides insights into the structure and functional predictability of macroinvertebrate communities. Quarterly macroinvertebrate... -
Hybridisation between native Oreochromis species and introduced Nile tilapia O. niloticus in the Kafue River, Zambia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AM Deines --- Notre Dame Environmental Change Initiative, and Department of Biological Sciences, USA I Bbole --- The Copperbelt University, Zambia C Katongo --- The Copperbelt University, Zambia JL Feder --- Notre Dame Environmental Change Initiative, and Department of Biological Sciences, USA DM Lodge --- Notre Dame Environmental Change Initiative, and Department of Biological Sciences, USAThe Nile tilapia Oreochromis niloticus has been introduced throughout Africa outside its native range for aquaculture purposes. Hybridisation between escaped O. niloticus and native Oreochromis species is of concern due to potential negative effects on wild genetic resources for conservation,... -
A RULE-BASED ECOSYSTEM MODEL FOR THE MANAGEMENT OF LAKE ST LUCIA
Item type: Journal Article • Journal: Southern African Journal of Child and Adolescent Mental Health • Authors: R.H. Taylor --- , South Africa B.P. Farm --- Dept. of Ecology and Behavioural Biology, United States of America A.M. Starfield --- Dept. of Ecology and Behavioural Biology, United States of AmericaLand transformations in the catchments of Lake St Lucia have altered the hydrology of the system and increased management is now needed to counteract these changes. There are several management options available, but prior to implementing them we must be... -
Observations on the Diel Vertical Distribution of Hydromedusae in the Southern Benguela
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: E. Buecher M. J. GibbonsDiel vertical migration (DVM) of six common species of hydromedusae was investigated during two drogue studies conducted in St Helena Bay on the west coast of South Africa in February 1995. Clytia spp., Obelia spp. and Bougainvillia macloviana, were largely... -
Hydromedusae Off the Orange River Mouth, Southern Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C. Sparks M. J. GibbonsA total of 242 zooplankton samples from the upper 100 m of the water column was collected discontinuously from March 1997 to January 1999 off the Orange River mouth on the west coast of southern Africa. Six species of hydromedusae... -
Ecosystem approach to fisheries management in the southern Benguela: a workshop overview
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L. J. Shannon K. L. Cochrane C. L. Moloney P. FréonA workshop was held in Cape Town in December 2002 to introduce the concept of an ecosystem approach to fisheries (EAF) management in the southern Benguela, and to examine the options for implementing an EAF in South Africa. The workshop... -
An ecosystem approach to fisheries in the southern Benguela context
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K. L. Cochrane C. J. Augustyn A. C. Cockcroft J. H. M. David M. H. Griffiths J. C. Groeneveld M. R. Lipińnski M. J. Smale C. D. Smith R. J. Q. TarrThe 2001 Reykjavík Declaration on Responsible Fisheries in the Marine Ecosystem and the Plan of Implementation of the 2002 World Summit on Sustainable Development highlighted the need in fisheries to look beyond considering only the target species and to consider... -
Contributions of the Benguela ecology programme to pelagic fisheries management in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C. L. Moloney C. D. Van Der Lingen L. Hutchings J. G. FieldIn 1982, the Benguela Ecology Programme (BEP) created a formal, multi-institutional research partnership in South Africa. During the next two decades, the BEP directed many aspects of pelagic ecosystem research in the southern Benguela upwelling region, aiming to improve fisheries... -
A brief introduction to some approaches to multispecies/ecosystem modelling in the context of their possible application in the management of South African fisheries
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D. S. Butterworth É. E. PlagányiAspects of the potential application of multispecies/ecosystem modelling to advise the management of South African fisheries are discussed. In general, reliable predictive ability from such models is likely to be achieved sooner for top predators, because relatively fewer links need... -
An ecosystem framework for fisheries management in the southern Benguela upwelling system
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L. J. Shannon C. L. MoloneyA "four-step framework" for applying ecosystem approaches to fisheries management in the southern Benguela is proposed. First, static ecosystem models can be used to highlight important interactions by assessing the net trophic impacts of each species on all the others... -
Ecosystem approach to fisheries management in the northern Benguela: the Namibian experience
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J-P. Roux L. J. ShannonThe northern Benguela marine resources have a long history of questionable management primarily because of the limitations of management measures under the political framework of the time (either free access or under an international authority with no national representation, authority... -
Simulations of fishing effects on the southern Benguela fish community using an individual-based model: learning from a comparison with ECOSIM
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: Y-J. Shin L. J. Shannon P. M. CuryBy applying an individual-based model (OSMOSE) to the southern Benguela ecosystem, a multispecies analysis is proposed, complementary to that provided by the application of ECOPATH/ECOSIM models. To reconstruct marine foodwebs, OSMOSE is based on the hypothesis that predation is a... -
Quantification and representation of potential spatial interactions in the southern Benguela ecosystem
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L. Drapeau L. Pecquerie P. Fréon L. J. ShannonThis work explores the potential spatial interactions between 13 key commercial species of the southern Benguela ecosystem: sardine Sardinops sagax, anchovy Engraulis encrasicolus, round herring Etrumeus whiteheadi, horse mackerel Trachurus trachurus capensis, chub mackerel Scomber japonicus, chokka squid Loligo vulgaris... -
Modelling stock dynamics in the southern Benguela ecosystem for the period 1978–2002
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L. J. Shannon V. Christensen C. J. WaltersAn ecosystem model of the southern Benguela was fitted to available time-series data for the period 1978–2002, to explore how changes in target fish populations in this ecosystem can be attributed to feeding interaction terms and population control patterns, the... -
Lessons learnt from a comparison of three ecosystem models for Port Phillip Bay, Australia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: E. A. Fulton A. D. M. SmithComparing multiple models applied to the same system can be highly instructive, both with regard to the system of interest and the models. In this case, three ecosystem simulation models (ECOSIM, Bay Model 2 [BM2] and the Integrated Generic Bay... -
Review of indicators in fisheries management – a development perspective
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: P. Degnbol A. JarreA review of indicators for an ecosystem approach to fisheries management is presented, focusing on multispecies fisheries and limited resources for assessments and implementation, as often is the case in developing countries. Emphasizing the need to link indicators to management... -
How can science contribute to an ecosystem approach to pelagic, demersal and rock lobster fisheries in South Africa?
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LJ Shannon PM Cury D Nel CD Van Der Lingen RW Leslie SL Brouwer AC Cockcroft L HutchingsSouth Africa is committed to moving towards an Ecosystem Approach to Fisheries (EAF) and has laid the foundations for this using a three-pronged approach: through a project (EAF Feasibility Study) under the Benguela Current Large Marine Ecosystem Programme; through a... -
A knowledge base for management of the capital-intensive fishery for small pelagic fish off South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TP Fairweather M Hara CD van der Lingen J Raakjær LJ Shannon GG Louw P Degnbol RJM CrawfordAs a contribution to South Africa's move towards an ecosystem approach to fisheries management, this study explores the existence of common perceptions about South Africa's pelagic fishery between resource users and scientists. It represents a collaborative research effort of social... -
A spatial- and age-structured assessment model to estimate the impact of illegal fishing and ecosystem change on the South African abalone Haliotis midae resource
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ÉE Plagányi --- Department of Mathematics and Applied Mathematics, South Africa DS Butterworth --- Department of Mathematics and Applied Mathematics, South AfricaThe management of abalone stocks worldwide is complicated by factors such as illegal fishing combined with the difficulties of assessing a sedentary (but not immobile) resource that is often patchily distributed. The South African abalone Haliotis midae fishery is faced... -
Temporal changes in kelp forest benthic communities following an invasion by the rock lobster Jasus lalandii
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LK Blamey --- , South Africa GM Branch --- , South Africa KE Reaugh-Flower --- , South AfricaThe rock lobster Jasus lalandii expanded its centre of distribution south-eastwards into an area known as ‘East of Cape Hangklip’ on the south-west coast of South Africa in the early 1990s. Using historical and present data, we analysed differences in... -
Modelling regime shifts in the southern Benguela: a frame-based approach
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MD Smith --- Marine Research (MA-RE) Institute and Zoology Department, South Africa A Jarre --- Marine Research (MA-RE) Institute and Zoology Department, South AfricaThis study explores the usefulness of a frame-based modelling approach in the southern Benguela upwelling ecosystem, with four frames describing observed small pelagic fish dominance patterns. We modelled the dynamics of sardine Sardinops sagax and anchovy Engraulis encrasicolus populations under... -
Cross-shelf observations of diet and diel feeding behaviour of the bearded goby Sufflogobius bibarbatus off Namibia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Hundt --- Department of Biology, Norway AC Utne-Palm --- Department of Biology, Norway MJ Gibbons --- Department of Biodiversity and Conservation Biology, South AfricaThe diet of the bearded goby Sufflogobius bibarbatus was studied at two 48 h stations off the Namibian coast. The inner station (120 m) was characterised by a deep layer of low-oxygen bottom water (<0.5 ml DO l−1 or <10%... -
Investigations into the diet and feeding ecology of the bearded goby Sufflogobius bibarbatus off Namibia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RB Cedras --- Department of Biodiversity and Conservation Biology, South Africa A-GV Salvanes --- Department of Biology, Norway MJ Gibbons --- Department of Biodiversity and Conservation Biology, South AfricaThe bearded goby Sufflogobius bibarbatus has come to replace sardine Sardinops sagax in the diets of many top predators within the marine environment off Namibia, and it is playing a key role within the region's foodweb. Previously published information on... -
Prioritising range-wide scientific monitoring of the Cape fur seal in southern Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SP Kirkman --- Department of Environmental Affairs, South Africa WH Oosthuizen --- Department of Environmental Affairs, South Africa MA Meÿer --- Department of Environmental Affairs, South Africa SM Seakamela --- Department of Environmental Affairs, South Africa LG Underhill --- Department of Zoology, South AfricaThe range of the Cape fur seal Arctocephalus pusillus pusillus population largely coincides with the region of the cold, nutrient-rich Benguela Current Large Marine Ecosystem (BCLME) adjoining the west coast of South Africa, Namibia and Angola. Range-wide scientific monitoring of... -
Assessing the ecosystem effects of the abalone Haliotis midae from its diet and foraging behaviour
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: Z Zeeman --- Department of Zoology and Marine Research Institute, South Africa GM Branch --- Department of Zoology and Marine Research Institute, South Africa TP Peschak --- Department of Zoology and Marine Research Institute, South Africa D Pillay --- Department of Zoology and Marine Research Institute, South AfricaThe South African abalone Haliotis midae is commercially exploited and seriously threatened by overfishing. This not only affects the species itself but potentially the functioning of the ecosystem because of associated changes in community structure. The nature of effects that... -
St Helena Bay (southern Benguela) then and now: muted climate signals, large human impact
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Hutchings --- Department of Environmental Affairs, South Africa A Jarre --- Marine Research (MA-RE) Institute, South Africa T Lamont --- Department of Environmental Affairs, South Africa M van den Berg --- Department of Environmental Affairs, South Africa SP Kirkman --- Department of Environmental Affairs, South AfricaThe development of suitable reference states for ecosystem-based management requires documentation of changes in structure and functioning of marine ecosystems, including assessment of the relative importance of bottom-up and top-down processes as drivers of change. We used monitoring data available... -
Role of the source community for the recovery of seagrass associated meiofauna: a field colonisation experiment with seagrass mimics in Diani Beach, Kenya
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LN Daudi --- , Kenya JN Uku --- , Kenya M De Troch --- Biology Department, Marine Biology, BelgiumSeagrass communities are subject to frequent disturbances that can affect the associated fauna. Seagrass loss in Kenya has been mainly due to extensive grazing by the sea urchin Tripneustes gratilla, leading to habitat fragmentation. The challenge is whether the system... -
Modelling the effect of food availability on recruitment success of Cape anchovy ichthyoplankton in the southern Benguela upwelling system
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: V Koné --- Département d'Environnement, Côte d'Ivoire C Lett --- , France P Fréon --- , FranceCape anchovy Engraulis encrasicolus adapted its reproductive strategies to the southern Benguela system by spawning over the Agulhas Bank, an area of low productivity that is located upstream of the predominant upwelling system. Frontal jet currents transport eggs and larvae... -
Reviewing evidence of marine ecosystem change off South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C L Moloney --- Department of Biological Sciences, South Africa S T Fennessy --- Oceanographic Research Institute, South Africa M J Gibbons --- Department of Biodiversity and Conservation Biology, South Africa A Roychoudhury --- Department of Earth Sciences, South Africa F A Shillington --- Marine Research Institute, South Africa B P von der Heyden --- Department of Earth Sciences, South Africa K Watermeyer --- Department of Biological Sciences, South AfricaRecent changes have been observed in South African marine ecosystems. The main pressures on these ecosystems are fishing, climate change, pollution, ocean acidification and mining. The best long-term datasets are for trends in fishing pressures but there are many gaps,... -
The support needs of South African educators affected by HIV and AIDS
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Linda Theron --- School of Education Sciences, Faculty of Humanities, South AfricaIn a qualitative study of 77 South African educators, participants were asked to explain how they are affected by HIV and AIDS and how they would best like to be supported in response to this. The term ‘affected’ refers to... -
Macroinvertebrate colonisation of artificial substrates in a Nigerian river I: gravel and leaf litter
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JO Olomukoro U OkologumeBenthic macroinvertebrate colonisation of artificial gravel and leaf litter substrates over periods of four to 40 days was examined in the Ogba River, Benin City, Nigeria. Of all the assemblages of organisms identified (398 individuals, 27 taxa) on different substrates,... -
Application of a chlorophyll index derived from satellite data to investigate the variability of phytoplankton in the Benguela ecosystem
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: H Demarcq R Barlow L HutchingsThe spatial and temporal variability in phytoplankton biomass in the Benguela ecosystem was investigated over an 8-year period using a chlorophyll index (Chl Index) derived from low resolution SeaWiFS ocean colour data. Monthly composite images revealed that the surface chlorophyll... -
Application of the sequential t-test algorithm for analysing regime shifts to the southern Benguela ecosystem
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JAE Howard A Jarre AE Clark CL MoloneyLong-term ecosystem changes, such as regime shifts, have occurred in several marine ecosystems world-wide. Multivariate statistical methods have been used to detect such changes. A new method known as the sequential t-test algorithm for analysing regime shifts (STARS) is applied... -
Comparing internal and external drivers in the southern Benguela and the southern and northern Humboldt upwelling ecosystems
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LJ Shannon S Neira M TaylorTrophic models of three upwelling ecosystems, the southern Benguela (South African), southern Humboldt (Chilean) and northern Humboldt (Peruvian) systems, have been fitted to catch, abundance and fishing mortality time-series. Three drivers were considered during the model fitting: internal forcing by... -
Changes in the trophic structure of the southern Benguela before and after the onset of industrial fishing
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: KE Watermeyer LJ Shannon CL GriffithsDespite a human presence in the Benguela region for at least one million years, exploitation of marine resources by European seafarers only began in earnest in the 1400s. Ecopath with Ecosim was used to construct and compare mass-balanced foodweb models... -
Changes in the trophic structure of the northern Benguela before and after the onset of industrial fishing
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: KE Watermeyer LJ Shannon J-P Roux CL GriffithsExploitation of marine resources has been occurring in the northern Benguela ecosystem for centuries. Understanding the cumulative long-term effects of this exploitation is important toward effective management of the modern system. Retrospective mass-balanced models of the ecosystem have been constructed,... -
Do inter-colony differences in Cape fur seal foraging behaviour reflect large-scale changes in the northern Benguela ecosystem?
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Skern-Mauritzen --- , Norway SP Kirkman --- Animal Demography Unit, Department of Zoology, South Africa E Olsen --- , Norway A Bjørge --- , Norway L Drapeau --- , France MA Meÿer --- Department of Environmental Affairs, South Africa J-P Roux --- Ministry of Fisheries and Marine Resources, Namibia S Swanson --- Department of Environmental Affairs, South Africa WH Oosthuizen --- Department of Environmental Affairs, South AfricaThe northern Benguela ecosystem adjoining Namibia has undergone considerable changes in recent decades, with reductions and northwards shifts of key prey species that have had severe implications for marine top predator populations. We investigated how such environmental variability may impact... -
Syndromes of dryland degradation in southern Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: RJ Scholes --- Natural Resources and the Environment, South AfricaDryland degradation (in other words, desertification) is defined for the purposes of this paper as a persistent decrease in the capacity of an arid or semiarid ecosystem to supply a range of services, including (but not restricted to) forage, fuel,... -
The ecology and management of the Miombo woodlands for sustainable livelihoods in southern Africa: the case for non-timber forest products
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: PW Chirwa S Syampungani CJ GeldenhuysThere is new and increasing emphasis on the contribution of non-timber forest products (NTFPs) to improving the livelihoods of rural communities and therefore the need for sustainable management of forest ecosystems of the Miombo woodlands to ensure the continued availability... -
Processes influencing the population dynamics and conservation of African penguins on Dyer Island, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Ludynia --- Marine Research Institute, Department of Biological Sciences, South Africa LJ Waller --- Western Cape Nature Conservation Board, South Africa RB Sherley --- Marine Research Institute, Department of Biological Sciences, South Africa F Abadi --- Animal Demography Unit, Department of Biological Sciences, South Africa Y Galada --- Marine Research Institute, Department of Biological Sciences, South Africa D Geldenhuys --- Western Cape Nature Conservation Board, South Africa RJM Crawford --- Animal Demography Unit, Department of Biological Sciences, South Africa LJ Shannon --- Marine Research Institute, Department of Biological Sciences, South Africa A Jarre --- Marine Research Institute, Department of Biological Sciences, South AfricaDyer Island, South Africa, supported the largest African penguin Spheniscus demersus colony in 1979 (22 655 breeding pairs), but population dynamics of the species have not followed the trends of adjacent colonies in years of high fish abundance or shifts... -
Changes in the trophic structure, abundance and species diversity of exploited fish assemblages in the artisanal fisheries of the northern coast, Senegal, West Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: I Ndour --- Institut Sénégalais de Recherches Agricoles [ISRA]/Centre de Recherche Océanographique de Dakar-Thiaroye [CRODT], Sénégal F Le Loc'h --- Institut de Recherche pour le Développement [IRD], Laboratoire des sciences de l'Environnement Marin [UMR 6539 LEMAR] (Centre national de la recherche scientifique [CNRS], France J Kantoussan --- Université Gaston Berger [UGB], Sénégal M Thiaw --- Institut Sénégalais de Recherches Agricoles [ISRA]/Centre de Recherche Océanographique de Dakar-Thiaroye [CRODT], Sénégal HD Diadhiou --- Institut Sénégalais de Recherches Agricoles [ISRA]/Centre de Recherche Océanographique de Dakar-Thiaroye [CRODT], Sénégal JM Ecoutin --- Institut de Recherche pour le Développement [IRD], Sénégal L Tito de Morais --- Institut de Recherche pour le Développement [IRD], Laboratoire des sciences de l'Environnement Marin [UMR 6539 LEMAR] (Centre national de la recherche scientifique [CNRS], France OT Thiaw --- L'Institut Universitaire de Pêche et d'Aquaculture [IUPA], SénégalThis work investigates the effects of changes in both fishing pressure and the environment on the trophic dynamics, abundance and diversity of species in the artisanal commercial fisheries off the northern coast of Senegal. Using artisanal commercial fishing data (provided... -
Assessment of the long-term response to rehabilitation of two wetlands in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: C Cowden --- GroundTruth CC, South Africa DC Kotze --- Centre for Water Resources Research, School of Environment, Agriculture and Earth Sciences, South Africa WN Ellery --- Geography Department, South Africa EJJ Sieben --- Department of Plant Sciences, South AfricaAssessing the ecological outcomes of wetland rehabilitation activities is an important need recognised by the ‘Working for Wetlands’ programme in South Africa. An assessment of ecological response was conducted in the Killarney and Kruisfontein wetlands, KwaZulu-Natal, in 2005 prior to... -
Decline of Terebralia palustris in South African mangroves
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JL Raw --- DST/NRF Research Chair in Shallow Water Ecosystems, South Africa R Perissinotto --- DST/NRF Research Chair in Shallow Water Ecosystems, South Africa RH Taylor --- School of Hydrology, South Africa NAF Miranda --- DST/NRF Research Chair in Shallow Water Ecosystems, South Africa N Peer --- DST/NRF Research Chair in Shallow Water Ecosystems, South AfricaTerebralia palustris (Linnaeus, 1767), the giant mangrove whelk, is a prominent component of mangrove ecosystem malacofauna in the Indo-West-Pacific region. On the east coast of Africa, the range of T. palustris extends from Kenya to the south-eastern region of South... -
Small mammal diversity and density on the Bokkeveld escarpment, South Africa – implications for conservation and livestock predation
Item type: Journal Article • Journal: African Zoology • Authors: P. J. O‘Farrell --- Botany Department, South Africa J. S. Donaldson --- South African National Biodiversity Institute, South Africa M. T. Hoffman --- Botany Department, South Africa A. D. Mader --- South African National Biodiversity Institute, South AfricaA preliminary investigation of the diversity and density of small mammals in four structurally distinct habitat types in an actively-utilized farming landscape was carried out. We sought to understand how diversity and density are influenced by landscape structure, habitat structure... -
The influence of fire on rodent abundance at the N’washitshumbe enclosure site, Kruger National Park, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: D.N. MacFadyen --- Mammal Research Institute, Department of Zoology and Entomology, South Africa N.L. Avenant --- Department of Mammalogy, South Africa M. van der Merwe --- Mammal Research Institute, Department of Zoology and Entomology, South Africa G.J. Bredenkamp --- Department of Plant Sciences, South AfricaThe relative population numbers of rodents were studied in nine habitats in and outside the N’washitshumbe enclosure site, Kruger National Park, before and after burning the firebreaks that surround the enclosure. Trap success was exceptionally high, and the field work... -
High population connectivity and Pleistocene range expansion in the direct-developing plough shell Bullia rhodostoma along the South African coast
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Muteveri --- Evolutionary Genomics Group, Department of Botany and Zoology, South Africa CA Matthee --- Evolutionary Genomics Group, Department of Botany and Zoology, South Africa RCK Bowie --- Museum of Vertebrate Zoology and Department of Integrative Biology, USA S von der Heyden --- Evolutionary Genomics Group, Department of Botany and Zoology, South AfricaPleistocene climatic and oceanographic changes have influenced the distribution of marine biodiversity in southern Africa. Most evidence, however, has been derived from rocky shore or demersal taxa; data on sandy shore species are limited, despite severe threats to many sandy... -
Ecosystem modelling in the southern Benguela: comparisons of Atlantis, Ecopath with Ecosim, and OSMOSE under fishing scenarios
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MD Smith --- Department of Zoology, Australia EA Fulton --- CSIRO [Commonwealth Scientific and Industrial Research Organisation], Australia RW Day --- Department of Zoology, Australia LJ Shannon --- Marine Research Institute and Department of Biological Sciences, South Africa Y-J Shin --- Marine Research Institute and Department of Biological Sciences, South AfricaEcosystem-based management of marine fisheries requires the use of simulation modelling to investigate the system-level impact of candidate fisheries management strategies. However, testing of fundamental assumptions such as system structure or process formulations is rarely done. In this study, we... -
Population metrics for fynbos birds, South Africa: densities, and detection and capture rates from a Mediterranean-type ecosystem
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Alan TK Lee --- Kirstenbosch Research Centre, South African National Biodiversity Institute, South Africa Phoebe Barnard --- Kirstenbosch Research Centre, South African National Biodiversity Institute, South Africa Philip AR Hockey --- Percy FitzPatrick Institute of African Ornithology, DST–NRF Centre of Excellence, South AfricaEstimates of bird numbers through quantification of density and range sizes are necessary for decisions regarding conservation status, yet counts of birds are often confounded by uncertainty of detection. The status of the endemic birds of the Fynbos biome is... -
Reef fishes recruited at midwater coral nurseries consume biofouling and reduce cleaning time in Seychelles, Indian Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S Frias-Torres --- Nature Seychelles, Republic of Seychelles H Goehlich --- Nature Seychelles, Republic of Seychelles C Reveret --- Nature Seychelles, Republic of Seychelles PH Montoya-Maya --- Nature Seychelles, Republic of SeychellesIn coral reef restoration, coral gardening involves rearing coral fragments in underwater nurseries prior to transplantation. These nurseries become fish-aggregating devices and attract biofouling. We hypothesised that: (1) the presence of corals at a nursery is critical to recruit fish... -
Post-fire vegetative recruitment of the alien grass Glyceria maxima at a KwaZulu-Natal Midlands dam, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LF Mugwedi --- School of Animal, Plant and Environmental Sciences, South Africa JM Goodall --- School of Animal, Plant and Environmental Sciences, South Africa ETF Witkowski --- School of Animal, Plant and Environmental Sciences, South Africa MJ Byrne --- Centre of Excellence for Invasion Biology, South AfricaAn accidental fire at a site where the reproductive behaviour of Glyceria maxima was being investigated provided an opportunity to measure its effect on G. maxima vegetative recruitment. The fire burned G. maxima growing along the water's edge and down... -
Diatoms as water quality indicators in the upper reaches of the Great Fish River, Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Holmes --- School of Biological Sciences, South Africa JC Taylor --- School of Biological Sciences, South AfricaThis study focused on the spring-fed upper reaches of the economically important Great Fish River with the aim of determining if diatoms could be used for biomonitoring in semi-arid conditions in southern Africa. Five sites were monitored monthly from 2010... -
In vitro screening for endocrine disruptive activity in selected South African harbours and river mouths
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JC Truter --- Department of Botany and Zoology, South Africa JH van Wyk --- Department of Botany and Zoology, South Africa BK Newman --- Coastal Systems Research Group, Natural Resources and the Environment, South AfricaVarious waterborne anthropogenic contaminants disrupt the endocrine systems of wildlife and humans, targeting reproductive pathways, among others. Very little is known, however, regarding the occurrence of endocrine disruptive activity in South African freshwater ecosystems, and coastal ecosystems have not been... -
Aboveground biomass production of a semi-arid southern African savanna: towards a new model
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Anthony R Palmer --- Agricultural Research Council–Animal Production Institute, South Africa Igshaan Samuels --- Agricultural Research Council–Animal Production Institute, South Africa Clement Cupido --- Agricultural Research Council–Animal Production Institute, South Africa Andiswa Finca --- Agricultural Research Council–Animal Production Institute, South Africa W Fransiska Kangombe --- Department of Biological Sciences, Namibia Isa AM Yunusa --- School of Environmental and Rural Sciences, Australia Susanne Vetter --- Department of Botany, South Africa Isaac Mapaure --- Department of Biological Sciences, NamibiaFollowing a field campaign to determine the species composition, canopy cover, aboveground annual production and leaf area index (LAI) of the semi-arid savanna of north-western Namibia, we present a production model that can be used by graziers to determine the... -
Reflooding the Faguibine floodplain system, northern Mali: potential benefits and challenges
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: O Hamerlynck --- Kenya Wetlands Biodiversity Research Team, Kenya SA Moulaye Zeine --- Global Monitoring, Mauritania JY Mutua --- Kenya Wetlands Biodiversity Research Team, Kenya LV Mukhwana --- Kenya Wetlands Biodiversity Research Team, Kenya M Yéna --- Direction Nationale de l’Hydraulique du Mali, MaliThe Faguibine system, northern Mali, consists of a series of interconnected floodplains of which the flooded surface area declined from about 1 000 km² in the late 19th century to only some 90 km² in 2010. Flood extent depends on... -
Studying the Logone floodplain, Cameroon, as a coupled human and natural system
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Moritz --- Department of Anthropology, USA S Laborde --- Department of Anthropology, USA SC Phang --- Department of Evolution, Ecology, and Organismal Biology, USA M Ahmadou --- University of Maroua, Cameroon M Durand --- Byrd Polar Research Center, USA A Fernandez --- Byrd Polar Research Center, USA IM Hamilton --- Department of Evolution, Ecology, and Organismal Biology, USA S Kari --- Centre d'Appui a la Recherche et au Pastoralisme (CARPA), Cameroon B Mark --- Byrd Polar Research Center, USA P Scholte --- Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ), Cameroon N Xiao --- Department of Geography, USA R Ziebe --- University of Maroua, CameroonAfrican floodplains are an excellent example of coupled human–natural systems because they exhibit strong interactions among multiple social, ecological, and hydrological systems. The intra-annual and interannual variations in seasonal flooding have direct and indirect impacts on ecosystems and human lives... -
Mangrove reforestation: greening or grabbing coastal zones and deltas? Case studies in Senegal
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MC Cormier-Salem --- IRD, UMR PALOC, Senegal J Panfili --- IRD, UMR MARBEC, FranceBesides their important contribution to global biodiversity, mangroves provide many services. Nevertheless, due to an increase of human activities and to climate change, in less than 20 years these ecosystems have lost one fifth of their global surface area. In... -
Have grass carp driven declines in macrophyte occurrence and diversity in the Vaal River, South Africa?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PSR Weyl --- Zoology and Entomology Department, South Africa GD Martin --- Zoology and Entomology Department, South AfricaThe Vaal River, South Africa, historically had a rich diversity of native submerged macrophytes with at least 13 species from 5 families recorded. Over the past 10 years there has been a noticeable reduction in the occurrence and diversity of... -
Characterisation of the dietary relationships of two sympatric hake species, Merluccius capensis and M. paradoxus, in the northern Benguela region using fatty acid profiles
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JA Iitembu --- Department of Fisheries and Aquatic Sciences, Namibia NB Richoux --- Department of Zoology and Entomology, South AfricaThe two sympatric species of Cape hake, Merluccius capensis and M. paradoxus, have been the main targets of bottom-trawl fisheries off Namibia for several decades. The feeding ecology of these hakes has been studied mainly using stomach content analyses and... -
Spatial characterisation of the Benguela ecosystem for ecosystem-based management
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SP Kirkman --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa L Blamey --- Marine Research Institute, South Africa T Lamont --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa JG Field --- Marine Research Institute, South Africa G Bianchi --- Food and Agriculture Organization, Italy JA Huggett --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa L Hutchings --- Marine Research Institute, South Africa J Jackson-Veitch --- Marine Research Institute, South Africa A Jarre --- Marine Research Institute, South Africa C Lett --- Institut de Recherche pour le Développement [IRD], UMR MARBEC 248, France MR Lipiński --- Department of Ichthyology and Fisheries Science, South Africa SW Mafwila --- Department of Fisheries and Aquatic Sciences, Namibia MC Pfaff --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa T Samaai --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa LJ Shannon --- Marine Research Institute, South Africa Y-J Shin --- Marine Research Institute, South Africa CD van der Lingen --- Marine Research Institute, South Africa D Yemane --- Marine Research Institute, South AfricaThe three countries of the Benguela Current Large Marine Ecosystem (BCLME), namely Angola, Namibia and South Africa, have committed to implementing ecosystem-based management (EBM) including an ecosystem approach to fisheries (EAF) in the region, to put in practice the principles... -
Habitat selection of the Black-shouldered Kite Elanus caeruleus in agroecosystems of Swaziland
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Katharine A Howard --- Department of Wildlife, Sustainability, and Ecosystem Sciences, USA Thomas W Schwertner --- Department of Wildlife, Sustainability, and Ecosystem Sciences, USA James P Muir --- Department of Wildlife, Sustainability, and Ecosystem Sciences, USA Ara Monadjem --- All Out Africa Research Unit, Department of Biological Sciences, SwazilandA decline in many African raptor populations may contribute to loss of ecosystem services such as pest control. The Black-shouldered Kite Elanus caeruleus stands out as an exception, experiencing range expansions due to its proclivity for agricultural landscapes. We surveyed... -
A system-level modelling perspective of the KwaZulu-Natal Bight ecosystem, eastern South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: UM Scharler --- School of Life Sciences, South Africa RC van Ballegooyen --- Coastal Systems Research Group, South Africa MJ Ayers --- School of Life Sciences, South AfricaThe KwaZulu-Natal Bight comprises the only sizeable shelf region on the eastern coast of South Africa, and is influenced by both the Agulhas Current on its seaward side and rivers and estuaries on its landward side. Established knowledge of the... -
Structure and dynamics of demersal fish assemblages over three decades (1985–2012) of increasing fishing pressure in Guinea
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ML Camara --- Centre National des Science Halieutiques de Boussoura (CNSHB), Republic of Guinea B Mérigot --- Université de Montpellier, France F Leprieur --- Université de Montpellier, France JA Tomasini --- Université de Montpellier, France I Diallo --- Centre National des Science Halieutiques de Boussoura (CNSHB), Republic of Guinea M Diallo --- Centre National des Science Halieutiques de Boussoura (CNSHB), Republic of Guinea D Jouffre --- Institut de Recherche pour le Développement, SenegalIn a context of growing fishing pressures and recommendations for an ecosystem approach to fisheries, there is a need to monitor changes in fish communities over time. In this study, we analysed data from scientific trawl surveys carried out on... -
Efficacy and deficiencies of rapid biomonitoring in biodiversity conservation: a case study in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: HM Barber-James --- Department of Freshwater Invertebrates, South Africa LL Pereira-da-Conceicoa --- Department of Zoology and Entomology, South AfricaRapid biomonitoring protocols, using biotic indices based on macroinvertebrate diversity to assess river ecosystem health, are widely used globally. Such quick assessment techniques are lauded for the rapid results obtained and the relatively easy protocol used to achieve an answer... -
Distribution and community structure of Ostracoda (Crustacea) in shallow waterbodies of southern Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: B Rumes --- Limnology Unit, Department of Biology, Belgium T Van der Meeren --- Limnology Unit, Department of Biology, Belgium K Martens --- Limnology Unit, Department of Biology, Belgium D Verschuren --- Limnology Unit, Department of Biology, BelgiumThe current study presents the ostracod communities recovered from 26 shallow waterbodies in southern Kenya, combined with an ecological assessment of habitat characteristics. A total of 37 waterbodies were sampled in 2001 and 2003, ranging from small ephemeral pools to... -
Effect of land use on water quality and phytoplankton community in the tropical Khami River in semi-arid southwest Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: T Dzinomwa --- Department of Environmental Science and Health, Faculty of Applied Science, Zimbabwe HGT Ndagurwa --- Department of Forest Resources and Wildlife Management, Faculty of Applied Science, ZimbabweThe water quality and phytoplankton community assemblage of the Khami River, a tropical river sub catchment in semi-arid southwest Zimbabwe impacted by agriculture and urban land use, were examined in March 2015. Conductivity, sulphates, total dissolved solids and salinity were... -
Land use change and its drivers in Kurt Bahir wetland, north-western Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: G Shewit --- Bahir Dar University, College of Agriculture and Environmental Sciences, Ethiopia M Minwyelet --- Bahir Dar University, College of Agriculture and Environmental Sciences, Ethiopia M Tesfaye --- Bahir Dar University, College of Agriculture and Environmental Sciences, Ethiopia T Lewoye --- Bahir Dar University, College of Agriculture and Environmental Sciences, Ethiopia M Ferehiwot --- Bahir Dar University, College of Agriculture and Environmental Sciences, EthiopiaThe effects of land-use change on ecosystem services in Kurt Bahir wetland were investigated during 2013 to 2014 using LANDSAT satellite images from 1973, 1986, 2002 and 2013 to identify and map changes in land-use classes over time. To understand... -
Periphytic diatom communities in tributaries around Lake Ichkeul, northern Tunisia: a preliminary assessment
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: N Ouchir --- Department of Earth Sciences F.S.B, Tunisia S Morin --- Unité de Recherche EABX, France L Ben Aissa --- Department of Earth Sciences F.S.B, Tunisia M Boughdiri --- Department of Earth Sciences F.S.B, Tunisia A Aydi --- Department of Earth Sciences F.S.B, TunisiaAn initial inventory of diatom biodiversity at 12 sites draining into Lake Ichkeul, northern Tunisia, was performed in summer 2014, together with the characterisation of metal pollution status by analysing trace metal concentrations to determine Water Quality Indices. The maximum... -
Determining fPAR and leaf area index of several land cover classes in the Pot River and Tsitsa River catchments of the Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Anthony R Palmer --- Centre for African Conservation Ecology, South Africa Andiswa Finca --- Agricultural Research Council–Animal Production Institute, South Africa Sukhmani K Mantel --- Institute for Water Research, South Africa Onalenna Gwate --- Institute for Water Research, South Africa Zahn Münch --- Department of Geography and Environmental Studies, South Africa Lesley A Gibson --- Department of Construction and Surveying, UKDetermining the quantum (both annual maxima and minima) and the temporal variation in the leaf area index (LAI), and the fraction of photosynthetically active radiation (fPAR), are three fundamental biophysical characteristics of the plant canopy that should parameterise ecophysiological models... -
Changes in vegetation structure and aboveground biomass in response to traditional rangeland management practices in Borana, southern Ethiopia
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Bikila Negasa Gilo --- Yabello Pastoral and Dryland Agriculture Research Center, Ethiopia Tessema Zewdu Kelkay --- Rangeland Ecology and Biodiversity Program, College of Agriculture and Environmental Sciences, EthiopiaThis study aimed to determine vegetation structure, species diversity and aboveground herbaceous biomass and browse yields in Borana rangelands of southern Ethiopia. Sampling through random allocation of quadrats within replicated sample plots was undertaken in communally grazed areas, grazing enclosures... -
Long-term livestock grazing increases the recruitment success of epigeal termites: insights from a >75-year grazing experiment in the Karoo, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: James G Hagan --- Department of Biological Sciences, South Africa Justin CO du Toit --- Grootfontein Agricultural Development Institute, South Africa Michael D Cramer --- Department of Biological Sciences, South AfricaEpigeal termites alter ecosystem-level processes through foraging and mound building. These effects are proportional to density. Whilst much is known about the factors influencing mound density in natural settings, how termites respond to livestock grazing has been overlooked. We compared... -
Grazing management that regenerates ecosystem function and grazingland livelihoods
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Richard Teague --- Department of Ecosystem Science and Management, USA Matt Barnes --- Shining Horizons Land Management LLC, USAAdopting a systems view and regenerative philosophy can indicate how to regenerate ecosystem function on commercial-scale agro-ecological landscapes. Adaptive multi-paddock grazing management is an example of an approach for grazinglands. Leading conservation farmers have achieved superior results in ecosystem improvement,... -
Exploring the Jawaharlal Nehru National Solar Mission (JNNSM): Impact on innovation ecosystem in India
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Amitkumar Singh Akoijam --- PhD Scholar, Centre for Studies in Science Policy (CSSP), School of Social Science, India V. V. Krishna --- Professorial Fellow, Faculty of Arts and Social Sciences, AustraliaTo make India one of the leaders in solar energy generation and to promote ecologically sustainable growth that addresses the nation’s energy security challenge is one of the promising goals of the Jawaharlal Nehru National Solar Mission (JNNSM) or National... -
Increasing crop diversity increased soil microbial activity, nitrogen-sourcing and crop nitrogen, but not soil microbial diversity
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Zander S Venter --- Department of Animal Sciences, South Africa Samantha L Scott --- Plant Conservation Unit, South Africa Johann Strauss --- Directorate-Plant Sciences, Western Cape Department of Agriculture, South Africa Karin Jacobs --- Department of Microbiology, South Africa Heidi-Jayne Hawkins --- Conservation South Africa, Centre for Biodiversity Conservation, Kirstenbosch National Botanical Gardens, South AfricaThe relationships between crop diversity, soil microbial diversity and agroecosystem functioning are not well understood. Soils under wheat monoculture, wheat–medic, and wheat–medic plus clover rotations from a 19-year-old wheat rotation trial in South Africa were measured for soil microbial functional... -
Phylogeny of the Sepia officinalis species complex in the eastern Atlantic extends the known distribution of Sepia vermiculata across the Benguela upwelling region
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AJE Healey --- Institute of Biological, Environmental and Rural Sciences (IBERS), Aberystwyth University, Wales NJ McKeown --- Institute of Biological, Environmental and Rural Sciences (IBERS), Aberystwyth University, Wales WM Potts --- Department of Ichthyology and Fisheries Science, South Africa CL de Beer --- Department of Ichthyology and Fisheries Science, South Africa W Sauer --- Department of Ichthyology and Fisheries Science, South Africa PW Shaw --- Institute of Biological, Environmental and Rural Sciences (IBERS), Aberystwyth University, WalesAccurate species identification and biogeographic characterisation are fundamental for appropriate management of expanding cephalopod fisheries. This study addresses this topic within the common cuttlefish Sepia officinalis species complex (S. officinalis, S. hierredda and S. vermiculata), with an emphasis on occurrence... -
Predatory pelagic fishes of the Bijagós Archipelago (Guinea-Bissau) show high overlap in diets dominated by sardinella
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: E Correia --- Centro de Estudos do Ambiente e do Mar (CESAM), Departamento de Biologia Animal, Portugal JP Granadeiro --- Centro de Estudos do Ambiente e do Mar (CESAM), Departamento de Biologia Animal, Portugal A Regalla --- Instituto da Biodiversidade e das Áreas Protegidas da Guiné-Bissau (IBAP), Guinea-Bissau E Dias --- Instituto da Biodiversidade e das Áreas Protegidas da Guiné-Bissau (IBAP), Guinea-Bissau A Almeida --- Centro de Investigação Pesqueira Aplicada (CIPA), Guinea-Bissau P Catry --- Marine and Environmental Sciences Centre (MARE), PortugalKnowledge of trophic interactions between the key components of marine communities is required to understand food-web dynamics and develop ecosystem-based management approaches. In West Africa, where fisheries sustain the livelihoods of a significant part of the human population, this understanding... -
Presence of microplastics in the tube structure of the reef-building polychaete Gunnarea gaimardi (Quatrefages 1848)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: HA Nel --- Department of Zoology and Entomology, South Africa PW Froneman --- Department of Zoology and Entomology, South AfricaThe prevalence of microplastics in the marine environment has resulted in a need to understand their association with various fauna. The aim of this study was to assess whether microplastic particles are present in the tube structure of the indigenous... -
Biometric variations and oxidative stress responses in juvenile Clarias gariepinus exposed to Termex®
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JU Nnadi --- Department of Zoology and Environmental Biology, Nigeria IN Dimelu --- Department of Home Economics and Hospitality Management Education, Nigeria SI Nwani --- Department of Agriculture Education, Nigeria JC Madu --- Department of Zoology and Environmental Biology, Nigeria CI Atama --- Department of Zoology and Environmental Biology, Nigeria GN Attamah --- Department of Zoology and Environmental Biology, Nigeria JI Okwor --- Department of Zoology and Environmental Biology, Nigeria CD Nwani --- Department of Zoology and Environmental Biology, NigeriaThe current study investigated the effects of termite insecticide, Termex® (imidacloprid 35.50% SC), on biometric variations and oxidative stress biomarkers in Clarias gariepinus. Fish were exposed to 4.00 and 6.00 µg l–1 sublethal Termex® concentrations in 2017. The gill and... -
Derivation of scenario-specific water quality guidelines for acid mine drainage in South Africa, using a risk-based approach
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: EC Vellemu --- Unilever Centre for Environmental Water Quality, South Africa PK Mensah --- Unilever Centre for Environmental Water Quality, South Africa N Griffin --- Unilever Centre for Environmental Water Quality, South Africa ON Odume --- Unilever Centre for Environmental Water Quality, South AfricaAcid mine drainage (AMD) continues to threaten water quality in many mining regions globally. Data paucity renders it challenging to inform appropriate water quality management strategies for a succinct scientific understanding of the effects of AMD on freshwater ecosystems. The... -
Seasonal variations in the diet and food selection of the Algerian hedgehog Atelerix algirus
Item type: Journal Article • Journal: African Zoology • Authors: Chafika Mouhoub-Sayah --- Laboratoire de Zoologie Appliquée et d’Ecophysiologie Animale, Faculté des Sciences de la Nature et de la Vie, Algeria Hafsa Djoudad-Kadji --- Laboratoire de Zoologie Appliquée et d’Ecophysiologie Animale, Faculté des Sciences de la Nature et de la Vie, Algeria Florian Kletty --- Université de Strasbourg, CNRS, IPHC, France André Malan --- Institut des Neurosciences Cellulaires et Intégratives, France Jean-Patrice Robin --- Université de Strasbourg, CNRS, IPHC, France Michel Saboureau --- Institut des Neurosciences Cellulaires et Intégratives, France Caroline Habold --- Université de Strasbourg, CNRS, IPHC, FranceThe Algerian hedgehog Atelerix algirus is an insectivorous species. However, the exact composition of its natural diet remains largely undetermined, especially in relation to seasonal variations in food availability. From March to November, we simultaneously analysed the composition of 180... -
A multimetric-index approach using fisheries data to assess fish assemblage structure in relation to salinity gradient in a tropical West African estuary
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Kantoussan --- Université Gaston Berger de Saint-Louis, Senegal JM Ecoutin --- Institut de Recherche pour le Développement (IRD), France R Laë --- Institut de Recherche pour le Développement (IRD), France OT Thiaw --- Institut Universitaire de Pêche et d’Aquaculture (IUPA), Université Cheikh Anta Diop de Dakar, Senegal L Tito de Morais --- Institut de Recherche pour le Développement (IRD), FranceThis study examines the effects of increasing salinity on fish assemblage structure in the Casamance Estuary, Senegal, using a series of indices. The study data were derived from commercial fishery surveys conducted between April and July 2005. Analysis of within-trophic-group... -
Effect of drift sampler exposure time and net mesh size on invertebrate drift density in the Njoro River, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PW Mureithi --- Department of Biological Sciences, Kenya JG Mbaka --- Department of Land and Water Management, Kenya CM M’Erimba --- Department of Biological Sciences, Kenya JM Mathooko --- Department of Biological Sciences, KenyaAlthough invertebrate drift is an important ecological process in lotic ecosystems, very little is known about it in Kenyan rivers. The primary aim of this study was to investigate the effect of driftnet mesh size and exposure duration on drift... -
Environmental responses of jellyfish polyps as drivers of medusa populations off the coast of Namibia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Ziegler --- Department of Biodiversity and Conservation Biology, South Africa MJ Gibbons --- Department of Biodiversity and Conservation Biology, South AfricaJellyfish populations in the southeastern Atlantic off the coast of Namibia have increased subsequent to the decline of small pelagic fisheries at the end of the 1960s, although the environment there has also become warmer and the waters off Walvis... -
Reflections, applications and future directions of Long-Term Ecological Research at Tierberg
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Gina Arena --- South African Environmental Observation Network (SAEON): Arid Lands Node, South Africa Helga van der Merwe --- South African Environmental Observation Network (SAEON): Arid Lands Node, South Africa Simon W Todd --- South African Environmental Observation Network (SAEON): Arid Lands Node, South Africa Marco J Pauw --- South African Environmental Observation Network (SAEON): Arid Lands Node, South Africa Suzanne J Milton --- South African Environmental Observation Network (SAEON): Arid Lands Node, South Africa W Richard J Dean --- South African Environmental Observation Network (SAEON): Arid Lands Node, South Africa Joh R Henschel --- South African Environmental Observation Network (SAEON): Arid Lands Node, South AfricaTierberg-LTER is a research site established in 1987 in the semi-arid Succulent Karoo near Prince Albert in the Western Cape province, South Africa. The original purpose for its establishment was to study ecosystem dynamics and the drivers of vegetation in... -
Zambian Invertebrate Scoring System (ZISS): A macroinvertebrate-based biotic index for rapid bioassessment of southern tropical African river systems
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: HF Dallas --- Freshwater Research Centre, Scarborough, South Africa S Lowe --- University of Glasgow, Scotland MP Kennedy --- Northern Rivers Institute, School of Geosciences, England K Saili --- Department of Geography and Environmental Studies, Zambia KJ Murphy --- University of Glasgow, ScotlandAn extensive survey of tropical rivers, conducted during 2009–2012 throughout Zambia, collected 151 samples of benthic macroinvertebrates, located on 95 rivers in six of the nine freshwater ecoregions. Associated data for physico-chemistry, human activities and ecosystem stressors were collected. Data... -
Environmental influence on phytoplankton communities in the northern Benguela ecosystem
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Barlow --- , South Africa T Lamont --- , South Africa D Louw --- , Namibia M-J Gibberd --- , South Africa R Airs --- , United Kingdom A van der Plas --- , NamibiaAn investigation of surface phytoplankton communities was undertaken on the shelf of the northern Benguela upwelling ecosystem during austral autumn (May) and spring (September), along latitudinal transects at 20° S and 23° S, from 2 to 70 nautical miles offshore,... -
Megabenthos and benthopelagic fishes on Southeast Atlantic seamounts
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: OA Bergstad --- Institute of Marine Research (IMR), Norway M Gil --- Departamento de Ecología y Biología Animal, Edificio de Ciencias Experimentales, Spain ÅS Høines --- Institute of Marine Research (IMR), Norway R Sarralde --- Instituto Espanol de Oceanografia, Centro Oceanografico de Canarias, Spain E Maletzky --- Ministry of Fisheries and Marine Resources, Namibia E Mostarda --- Food and Agriculture Organization of the United Nations (FAO), Italy L Singh --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa MA António --- Secretary of State of Affairs, Ministry of Agriculture, Rural Development and Fisheries, Angola F Ramil --- Departamento de Ecología y Biología Animal, Edificio de Ciencias Experimentales, Spain P Clerkin --- Pacific Shark Research Center (PSRC), Moss Landing Marine Laboratories, United States G Campanis --- South East Atlantic Fisheries Organisation (SEAFO) Secretariat, NamibiaIn a descriptive study of megafauna of several Southeast Atlantic seamounts, multiple video-transects on upper slopes and summits documented the occurrence of benthic invertebrate taxa, primarily corals, regarded as indicators of vulnerable marine ecosystems (VMEs) as defined in international guidelines... -
Describing gonad development and gametogenesis in southern Africa’s endemic box jellyfish Carybdea branchi (Cubozoa, Carybdeidae)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Mohamed --- Department of Biodiversity and Conservation Biology, South Africa H Skrypzeck --- Department of Biodiversity and Conservation Biology, South Africa MJ Gibbons --- Department of Biodiversity and Conservation Biology, South AfricaInformation on the reproductive development of species of box jellyfish (class Cubozoa) is poor globally, despite their significance as potent stingers and worrying projections about range expansions. While most species are confined to tropical and subtropical waters, the South African... -
Spatial considerations when monitoring reef fishes
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Parker --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa H Winker --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa ATF Bernard --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa MKS Smith --- South African National Parks, Rondevlei Scientific Services, South Africa A Götz --- South African Environmental Observation Network (SAEON), South AfricaSpatial dependence can obscure relationships between response and explanatory variables because of structuring within the residuals reducing variance and biasing coefficient estimates. Here, we highlight the influence of the spatial component, in the presence of spatial dependence, on abundance trends... -
Protected nearshore shallow and deep subtidal rocky reef communities differ in their trophic diversity but not their nutritional condition
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ER Heyns-Veale --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa NB Richoux --- Department of Zoology and Entomology, South Africa ATF Bernard --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa A Götz --- Elwandle Node, South African Environmental Observation Network (SAEON), South AfricaLarge physical changes that alter reef macrobenthos and fish assemblages occur with increasing depth, so the biological processes that regulate communities at different depths are expected to diverge. We used analyses of stable isotopes (δ13C and δ15N) and fatty acids... -
Developing pathways to improve smallholder agricultural productivity through ecological intensification technologies in semi-arid Limpopo, South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Farirai Rusere --- Climate System Analysis Group, Department of Environmental and Geographical Science, South Africa Siyabusa Mkuhlani --- Climate System Analysis Group, Department of Environmental and Geographical Science, South Africa Olivier Crespo --- Climate System Analysis Group, Department of Environmental and Geographical Science, South Africa Lynn V. Dicks --- School of Biological Sciences, UKAgriculture faces an enormous global challenge of feeding nine billion people by 2050. This means a comprehensive intensification of agriculture is required. Ecological intensification is gaining momentum as a clearly defined vision for increasing agriculture productivity and sustainability. How ecological... -
The relevance of the content of an HIV and AIDS social intervention programme for the youth in the Northern Cape, South Africa
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: André R Le Tape --- Department of Social Work and Criminology, South Africa Lourens S Geyer --- Department of Social Work and Criminology, South Africa Charlene L Carbonatto --- Department of Social Work and Criminology, South AfricaThe numbers of people infected with HIV and living with AIDS remain high in South Africa. The youth of the Northern Cape province in South Africa are a vulnerable population in this regard. However, there seems to be a dearth... -
Assessment of persistent organochlorine compounds contamination on the Lake Victoria water and sediments: a case study in Tanzania
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Wenaty --- Department of Food Technology, Nutrition and Consumer Sciences, Tanzania F Mabiki --- Department of Chemistry and Physics, Tanzania B Chove --- Department of Food Technology, Nutrition and Consumer Sciences, Tanzania R Mdegela --- Department of Veterinary Medicine and Public Health, TanzaniaThe current study was conducted to establish the levels of organochlorine pesticides (OCPs), its degradation products, and indicatory polychlorinated biphenyls (PCBs) in water and sediments from Lake Victoria in Tanzania. Seven indicator PCBs were identified in sediments, and five were... -
Changes in decomposition rate and litterfall in riparian zones with different basal area of exotic Eucalyptus in south-eastern Brazil
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Glaucia Regina Santos --- Department of Forest Science, Brazil Marina Shinkai Gentil Otto --- Department of Forest Science, Brazil José Raimundo de Souza Passos --- Department of Biostatistics, Brazil Felipe Ferreira Onofre --- Department of Forest Science, Brazil Valdemir Antônio Rodrigues --- Department of Forest Science, Brazil Felipe Rossetti de Paula --- Department of Forest Science, Brazil Silvio Frosini de Barros Ferraz --- Department of Forest Science, BrazilExotic species in riparian environments can influence the quantity and quality of litterfall in the ecological system. The objective of this study was to evaluate the influence of Eucalyptus leaves on litterfall and terrestrial and aquatic leaf decomposition in a... -
Water quality assessment using benthic macroinvertebrates as bioindicators in streams and rivers around Sebeta, Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Mezgebu --- Department of Fisheries and Aquatic Sciences, Ethiopia A Lakew --- National Fisheries and Aquatic Life Research centre, Ethiopia B Lemma --- Department of Zoological Sciences, EthiopiaThe increasing impact of human activities on the freshwater-bodies of Ethiopia requires an efficient and cost-effective method for ecological health assessment. In the current study, benthic macroinvertebrates were used to assess the impact of different stressors originating from industries and... -
Spatial modelling of cumulative human pressure in the tropical coastscape of Zanzibar, Tanzania
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ZA Khamis --- Department of Geography and Geology, Finland R Kalliola --- Department of Geography and Geology, Finland N Käyhkö --- Department of Geography and Geology, FinlandCoastal landscapes and seascapes (‘coastscapes’) are under immense anthropogenic pressures emanating from multiple human activities. We applied spatial modelling to characterise the cumulative pressures in the coastscape of Zanzibar’s main island Unguja (hereafter Zanzibar), in the western Indian Ocean. We... -
The status and conservation of the Cape Gannet Morus capensis
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Richard B Sherley --- Environment and Sustainability Institute/Centre for Ecology and Conservation, United Kingdom Robert JM Crawford --- Department of Environment, Forestry and Fisheries (DEFF), South Africa Bruce M Dyer --- Department of Environment, Forestry and Fisheries (DEFF), South Africa Jessica Kemper --- African Penguin Conservation Project, Namibia Azwianewi B Makhado --- Department of Environment, Forestry and Fisheries (DEFF), South Africa Makhudu Masotla --- Department of Environment, Forestry and Fisheries (DEFF), South Africa Lorien Pichegru --- DST-NRF Centre of Excellence at the FitzPatrick Institute of African Ornithology, Department of Biological Sciences, South Africa Pierre A Pistorius --- DST-NRF Centre of Excellence at the FitzPatrick Institute of African Ornithology, Department of Biological Sciences, South Africa Jean-Paul Roux --- Ministry of Fisheries and Marine Resources, Namibia Peter G Ryan --- DST-NRF Centre of Excellence at the FitzPatrick Institute of African Ornithology, Department of Biological Sciences, South Africa Desmond Tom --- Ministry of Fisheries and Marine Resources, Namibia Leshia Upfold --- Department of Environment, Forestry and Fisheries (DEFF), South Africa Henning Winker --- Department of Environment, Forestry and Fisheries (DEFF), South AfricaThe Cape Gannet Morus capensis is one of several seabird species endemic to the Benguela upwelling ecosystem (BUS) but whose population has recently decreased, leading to an unfavourable IUCN Red List assessment. Application of ‘JARA’ (‘Just Another Red-List Assessment,’ a... -
Geographical and temporal variation in the diet of Bank Cormorants Phalacrocorax neglectus in South Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: BM Dyer --- Department of Environment, South Africa J Cooper --- Department of Botany and Zoology, South Africa RJM Crawford --- Department of Environment, South Africa RB Sherley --- Environment and Sustainability Institute, University of Exeter, United Kingdom S Somhlaba --- Department of Environment, South Africa A Cockcroft --- Department of Environment, South Africa L Upfold --- Department of Environment, South Africa AB Makhado --- Department of Environment, South AfricaThe Bank Cormorant Phalacrocorax neglectus is endemic to the Benguela upwelling ecosystem off southwest Africa and is classified as Endangered owing to a recent large reduction in its number. It is thought that food scarcity, including a decreased abundance of... -
Physico-chemical and microalgal gradients change rapidly in response to mouth closure in a predominantly open estuary
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DA Lemley --- Botany Department and the Institute for Coastal and Marine Research, South Africa JB Adams --- Botany Department and the Institute for Coastal and Marine Research, South AfricaA third of South Africa’s freshwater flow no longer reaches the coast, yet few systems have shifted from being permanently open to temporarily closed. For the first time since 1969, the Gamtoos Estuary mouth closed in June 2018, because of... -
Plant-parasitic nematode assemblages associated with glyphosate tolerant and conventional soybean cultivars in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: A Mbatyoti --- Unit for Environmental Sciences and Management, South Africa MS Daneel --- Agricultural Research Council-Tropical and Subtropical Crops, South Africa A Swart --- Agricultural Research Council-Plant Health and Protection, South Africa M Marais --- Agricultural Research Council-Plant Health and Protection, South Africa D De Waele --- Unit for Environmental Sciences and Management, South Africa H Fourie --- Unit for Environmental Sciences and Management, South AfricaInformation about the non-target effects of glyphosate, a broad-spectrum systemic herbicide on soil-borne nematodes is scarce and not well documented for South African agricultural fields. In the present study, the abundance and identity of plant-parasitic nematodes in roots and rhizosphere... -
Trends in chemical pollution and ecological status of Lake Ziway, Ethiopia: a review focussing on nutrients, metals and pesticides
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LB Merga --- , The Netherlands AA Mengistie --- , Ethiopia JH Faber --- , The Netherlands PJ Van den Brink --- , The NetherlandsAquatic ecosystems contribute to human well-being by delivering ecosystem services, but their protection has been given low priority in Africa. Lake Ziway in the Ethiopian Rift Valley basin provides services including irrigation, drinking water and fish food in the region... -
Water hyacinth (Eichhornia crassipes) affects the composition and abundance of zooplankton in the littoral region of Koka Reservoir, Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: H Getnet --- , Ethiopia D Kifle --- , Ethiopia T Fetahi --- , EthiopiaWater hyacinth, Eichhornia crassipes (Martius) Solms 1883, is a rampant invasive aquatic plant that is recognised as one of the ten worst weeds in the world. Its appearance in Koka Reservoir was reported in 1965 and since then it has... -
Accounting for linefish dependency in management of the South African small pelagic fishery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Parker --- , South Africa JC Coetzee --- , South Africa H Winker --- , South Africa CD van der Lingen --- , South AfricaTo further implement an ecosystem approach to management of the small pelagic fishery in South Africa, we attempted to develop functional relationships between spatialised time-series of the biomass of three small pelagic fish species and the catch per unit effort... -
Assessing wetland functionality using soil surface indicators in Letšeng- la-Letsie wetland in Quthing District, Lesotho
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Nthuseng Kahlolo --- , Lesotho Botle Mapeshoane --- , Lesotho Peter Chatanga --- , Lesotho Lerato Seleteng-Kose --- , Lesotho Makoala V Marake --- , LesothoWetlands are globally valuable ecosystems as they provide many important services to the human society, yet the ecology of some of them is yet to be understood. This study assessed the functionality of Letšeng-la-Letsie wetland in Lesotho, using the Landscape... -
Reliability and quality of artificial nectar feeders for birds in the Cape Floristic Region
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Anina Coetzee --- , South Africa Phoebe Barnard --- , South Africa Anton Pauw --- , South AfricaSupplementary feeding of birds may have considerable ecological and evolutionary effects on bird communities. However, there is a lack of basic information on the prevalence, frequency and quality of supplementary feeders, especially in African urban areas. Here we describe the... -
Effects of fragmented mangroves on macrozoobenthos: a case study of mangrove clearance for powerline right-of-way at Oproama Creek, Niger Delta, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: N Zabbey --- , Nigeria IG Ekpenyong --- , Nigeria GN Nwipie --- , Nigeria IC Davies --- , Nigeria K Sam --- , NigeriaMangroves are vulnerable to varying magnitudes of degrading impact by human activities. Despite the many benefits of mangrove ecosystems, mangroves in the Niger Delta region are often cleared for electric powerline and oil pipeline rights-of-way, recreation, road construction, housing and... -
Diversity of benthic macroinvertebrates in anthropogenically disturbed Aturukuku River, Eastern Uganda
Item type: Journal Article • Journal: African Zoology • Authors: Hannington Ochieng --- , Uganda Willy P Gandhi --- , Uganda Godfrey Magezi --- , Uganda James Okot-Okumu --- , Uganda Robinson Odong --- , UgandaBiodiversity conservation has focused on large vertebrates and plants with pronounced economic value, compared with smaller organisms such as benthic macroinvertebrates that play a particular role in freshwater ecosystems. The increasing loss and degradation of freshwater habitats, coupled with low... -
Stakeholders’ perceptions of mammal occurrence and abundance on agricultural properties bordering the Boland Mountain Complex, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Willem A Nieman --- , South Africa Brittany C Schultz --- , South Africa Anita Wilkinson --- , South Africa Alison J Leslie --- , South AfricaThe encroachment of agricultural landscapes on natural ecosystems poses a significant threat to native wildlife persistence. In the Boland Mountain Complex (BMC), the presence of mammals was well documented in the 20th century, but an updated account is lacking. This... -
Diversity pattern of bats (Mammalia: Chiroptera) in a modified tropical environment in the western region of Cameroon
Item type: Journal Article • Journal: African Zoology • Authors: Manfothang Dongmo Ervis --- , Cameroon Bakwo Fils Eric-Moise --- , Cameroon Mongombe Manga Aaron --- , Cameroon Atagana Patrick Jules --- , Cameroon Tchuenguem Fohouo Fernand-Nestor --- , CameroonThe western region of Cameroon is one of the leading agricultural production areas in sub-Saharan Africa, and this ongoing anthropogenic perturbation has led to the replacement of natural forests with agroecosystems. Such anthropogenic landscape transformations may have affected bat species... -
Comparison of the particle size distributions of sediment collected from sandy seafloor using a Van Veen grab and cone dredge
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GM van der Heever --- , South Africa LJ Atkinson --- , South Africa CEO von der Meden --- , South AfricaSediment particle size is an important environmental parameter that influences benthic species composition and is frequently used in habitat and ecosystem classification systems. In South Africa, benthic grabs are regularly used to collect seafloor sediment samples for particle size analysis... -
Metabarcoding of marine zooplankton in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SP Singh --- , South Africa JC Groeneveld --- , South Africa J Huggett --- , South Africa D Naidoo --- , South Africa R Cedras --- , South Africa S Willows-Munro --- , South AfricaMetabarcoding is an emerging method in which DNA barcoding is combined with next-generation sequencing to determine the biodiversity of taxonomically complex samples. We assessed the current state of DNA barcode reference databases for marine zooplankton in South Africa and undertook... -
When the flathead mullet left St Lucia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AK Whitfield --- , South AfricaThe St Lucia estuarine system on the east coast of South Africa is a declared World Heritage Site and Ramsar Site of International Importance. A major ecological feature of St Lucia during the last century was the annual spawning migration... -
Topo-edaphic environment and forestry plantation disturbance affect the distribution of grassland forage and non-forage resources, Maputaland, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: AP Starke --- , South Africa TG O’Connor --- , South Africa CS Everson --- , South AfricaGrasslands are integral to rural livelihoods in southern Africa, because they provide hydrological regulation services and a variety of plant resources, including livestock fodder, medicines, and food products. To ensure ongoing provision of these resources in rapidly developing rural landscapes,... -
Industrial symbiosis in Tanzania: A case study from the sugar industry
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Amani G. Rweyendela --- , Tanzania William J. S. Mwegoha --- , TanzaniaThe concept of industrial symbiosis (IS) offers enormous potential for more sustainable manufacturing processes. This paper sets out to explore the IS forms occurring at a case study of the Kilombero Sugar Company Limited (KSCL), the largest sugar refinery in... -
An innovation intermediary for Nairobi, Kenya: Designing student-centric services for university-industry collaboration
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Mikko Koria --- , United Kingdom Roberto Hinojosa Osorno --- , Mexico Ida Telalbasic --- , United Kingdom Delia del Carmen Ramírez Vázquez --- , Mexico Emmy Chirchir --- , KenyaEngaging students as partners in university-industry collaboration (UIC) through challenge-based and real-life projects creates significant value for all participants through novel educational approaches, talent recruitment, user-driven innovation, new resources, and research-related opportunities. However, as these practices have developed iteratively over... -
A critical review of macroinvertebrate-based bioassessment approaches in Africa’s lotic systems: developments, challenges, and legal requirements
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: John Peter Obubu --- , Ethiopia Seyoum Mengistou --- , Ethiopia Tadesse Fetahi --- , Ethiopia Wolfram Graf --- , Austria Robinson Odong --- , UgandaWorldwide, water resources have an impact on all forms of life as lotic systems are networks that interconnect water resources and land. They are important for navigation, water supplies, agriculture, recreation, and industrial development and help to regulate changes in... -
Sponges as simple biomonitoring tools for trace element pollution in marine environments: insights from a Kenyan study focused on the leaf sponge Phyllospongia foliascens
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BO Ohowa --- , Kenya LI Kiteresi --- , Kenya VW Wanjeri --- , Kenya SM Mwamburi --- , Kenya SL Tunje --- , KenyaThe potential of the marine leaf sponge Phyllospongia foliascens as a simple biomonitor of trace element pollution was assessed. The concentrations of arsenic (As), cadmium (Cd), chromium (Cr), copper (Cu), manganese (Mn) and zinc (Zn) in sediments and in P... -
Sedimentary charcoal studies from southern Africa’s grassy biomes: a potential resource for informing the management of fires and ecosystems
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Abraham N Dabengwa --- , South Africa Sally Archibald --- , South Africa Jemma Finch --- , South Africa Louis Scott --- , South Africa Lindsey Gillson --- , South Africa William J Bond --- , South AfricaAfrican grassy biomes evolved together with fire and have a long history of human manipulation of fire, yet few rangeland studies acknowledge the role of prehistoric fire in shaping contemporary ecological patterns. Nevertheless, prehistoric fire records have been used elsewhere... -
Development of a multimetric index for assessing the ecological integrity of some selected rivers and streams in the north-eastern part of Lake Tana sub-basin, Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Amelework Zewudu --- , Ethiopia Getachew Beneberu --- , Ethiopia Minwyelet Minigst --- , Ethiopia Amare Mezgebu --- , EthiopiaA multimetric index was developed using benthic macroinvertebrates to assess the ecological health of selected rivers and streams in the north-eastern part of Lake Tana subbasin, Ethiopia. One-time extensive sampling was carried out during the post-rainy season (November–December) of 2016... -
Macrophyte species diversity and distribution in relation to water quality of the Cheleleka Wetland in Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Haymanot Tesfaye --- , Ethiopia Bikila Warkineh --- , EthiopiaThe Cheleleka Wetland is located in the Ethiopian Rift Valley on the upper shore of Lake Hawassa, after which the regional capital is named. This study investigated the relationship between water quality and the occurrence and diversity of macrophyte species... -
Supporting marine spatial planning with an ecosystem model of Algoa Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Ortega-Cisneros --- , South Africa E Weigum --- , South Africa R Chalmers --- , South Africa S Grusd --- , South Africa AT Lombard --- , South Africa L Shannon --- , South AfricaThe Ecopath with Ecosim (EwE) modelling framework was used to develop a model of Algoa Bay and test the ecosystem impacts of the implementation of the Addo Elephant National Park Marine Protected Area (MPA). The Ecopath model included 37 functional... -
Barriers to development of entrepreneurial ecosystems and economic performance in Southern Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Beverlley Madzikanda --- , People’s Republic of China Cai Li --- , People’s Republic of China Francis Tang Dabuo --- , People’s Republic of ChinaSouthern Africa has fewer innovative entrepreneurs per capita than other regions of Africa and a high failure rate amongst SMEs. Common problems such as corruption, crime and poverty plague the region, and as a result many of the economies do... -
Aggregate dynamics and intra-aggregate carbon contents as influenced by long-term wheat production management in semi-arid South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: LS Tlomatsana --- , South Africa PF Loke --- , South Africa E Kotzé --- , South Africa MP Aghoghovwia --- , South AfricaSoil aggregate dynamics have received renewed interest due to their relevance in carbon (C) stabilisation. This study evaluated changes in aggregate-size distribution and intra-aggregate C following 41 years of wheat production in semi-arid central South Africa. Management practices that have... -
Local perceptions and sociocultural value of Hooded Vultures Necrosyrtes monachus in Burkina Faso, West Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Clément Daboné --- University Centre of Tenkodogo/University Thomas Sankara, Burkina Faso Adama Ouéda --- University Joseph Ki-Zerbo, Burkina Faso Lindy J Thompson --- , South Africa Jacques Boco Adjakpa --- University of Abomey-Calavi, Benin Peter DM Weesie --- University of Groningen, The NetherlandsHooded Vultures have suffered from dramatic population declines in recent decades owing to anthropogenic pressures. To properly address this threat, the sociocultural perspectives towards this species should be considered. We examined peoples' perceptions, knowledge and beliefs on Hooded Vulture's sociocultural... -
An indicator-based approach for cross-realm coastal biodiversity assessments
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LR Harris --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa AL Skowno --- South African National Biodiversity Institute (SANBI), South Africa KJ Sink --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa L van Niekerk --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa SD Holness --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa M Monyeki --- South African National Biodiversity Institute (SANBI), South Africa P Majiedt --- South African National Biodiversity Institute (SANBI), South AfricaEcosystem status assessments are generally separated into realm-specific analyses (terrestrial, freshwater, estuarine or marine), but without integrating these into a coherent assessment of coastal biodiversity across the land–sea interface. Trends in assessment indicators in coastal versus non-coastal areas have also... -
A comparative review of decision support tools routinely used by selected transboundary River Basin Organisations
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: H Bukhari --- , South Africa CA Brown --- , South AfricaAs human pressures on water resources increase, the data and decision support (DS) tools used in the governance, development and management of transboundary rivers are likely to become increasingly important. There are no universal, standardised selection processes or designs for... -
The contribution and value of the trait-based approach to water resource protection
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Oghenekaro Nelson Odume --- , South AfricaFreshwater is one of the Earth’s most crucial resources for social-economic development and prosperity. Biomonitoring contributes to water resource protection by integrating a holistic picture of ecosystem health through an analysis of resident biota. The taxonomy-based approach, in which taxa... -
DRIFT: incorporating an eco-social system network and time series approach into environmental flow assessments
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AR Joubert --- , South Africa CA Brown --- , South Africa JM King --- , South Africa H Beuster --- , South Africa A Greyling --- , South AfricaDRIFT (Downstream Response to Imposed Flow Transformation) is an interactive, ecological-social process and software package to assist with environmental flow assessments and river management decision-making. It was originally developed in the 1990s and has subsequently evolved and been applied in... -
Comparison of physico-chemical parameters with macroinvertebrate and vertebrate fauna of Lake Ogelube and Lake Ojii, Opi-Agu, south-eastern Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: IE Onah --- , OJ Ajanwachukwu --- , PO Ubachukwu --- ,The physico-chemical parameters of water provide crucial information on the condition of a waterbody at a point in time. Physico-chemical parameters determine the primary and secondary productivity of an aquatic ecosystem. Data on water temperature, pH, turbidity, water depth, total... -
Comparison of oxidative stress biomarkers in Oreochromis mossambicus in minimally and highly disturbed aquatic environments in the Matabeleland region, Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Z Makuvara --- , Zimbabwe J Marumure --- , Zimbabwe L Chapungu --- , Zimbabwe J Machingura --- , South Africa AH Siwela --- , ZimbabweOwing to their ability to provide a functional measure of organismal response to chemical stressors, oxidative biomarkers are useful in ecotoxicological studies to assess disturbance in aquatic environments. This study assessed the use of oxidative stress biomarkers in Oreochromis mossambicus... -
Height growth strategies of Mimosa scabrella along a chronosequence
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Vinicius Costa Cysneiros --- Federal University of Paraná, Brazil Sebastião do Amaral Machado --- Federal University of Paraná, Brazil Allan Libanio Pelissari --- Federal University of Paraná, Brazil Edilson Urbano --- State University of Mato Grosso do Sul, Aquidauana University Unit, BrazilAssessing variations in tree allometry is useful for understanding height growth strategies in relation to life-history trajectories, light competition and environmental restrictions. Scaling exponent and asymptotic heights obtained from height–diameter (HD) models may elucidate how trees optimise growth strategies and... -
Spatio-temporal variation in phytoplankton community structure in backwaters of the Ketar River, central Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Yadesa Chibsa --- Wachemo University, Ethiopia Seyoum Mengistou --- Addis Ababa University, Ethiopia Demeke Kifle --- Addis Ababa University, EthiopiaThis study assessed the spatio-temporal dynamics of the phytoplankton community in backwaters of the Ketar River, central Ethiopia, in relation to water quality and macrophyte coverage. Phytoplankton samples and physicochemical information were collected at six sites along the river over... -
The diversity of epigeal insects after the application of the brush packing restoration method following bush-encroachment control in South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: A Marquart --- North-West University, South Africa OB Sikwane --- North-West University, South Africa K Kellner --- North-West University, South AfricaEvidently, bush encroachment caused by factors, such as overgrazing, results in a change in savanna ecosystems. This shift in vegetation structure can affect many factors, including insect fauna. Epigeal arthropods occupy smaller habitat patches and therefore respond to the effects... -
Seedling establishment and early growth in Calobota sericea subjected to moisture stress
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Francuois Müller --- , South Africa Letty Masemola --- , South Africa Stephen Modiba --- , South Africa Nothando Ngcobo --- , South AfricaThe South African perennial legume Calobota sericea (Thunb.) Boatwr. & B-E van Wyk has been shown to be drought tolerant as mature plants, but information on drought tolerance of seedlings is lacking. This study evaluated the impact of moisture stress... -
Understanding the effects of climate change on Southern Ocean ecosystems
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CD McQuaid --- Rhodes University, South AfricaUnderstanding the future of Southern Ocean ecosystems requires approaches at micro to macro scales. The Southern Ocean has experienced both top-down and bottom-up perturbations driven by man. The removal of whales and finfish was a top-down disruption, removing enormous levels... -
Mapping fine-scale demersal trawl effort for application in ecosystem assessment and spatial planning
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JC Currie --- South African National Biodiversity Institute (SANBI), South Africa LR Harris --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa LJ Atkinson --- South African Environmental Observation Network (SAEON), South Africa TP Fairweather --- Fisheries and the Environment (DFFE), South Africa KJ Sink --- South African National Biodiversity Institute (SANBI), South AfricaFine-scale maps of fishing activity are valuable information layers for fisheries management, assessments of biodiversity impacts and marine spatial planning. Our aim was to develop an accurate map of demersal trawling intensity in South Africa and to demonstrate its utility... -
Lepidoptera as a tool for the assessment of human disturbance impacting ecological and taxonomic diversity in the Choke Mountains, Ethiopia
Item type: Journal Article • Journal: African Zoology • Authors: --- Ethiopian Biodiversity Institute, Ethiopia --- University of Brescia, Italy --- University of Brescia, Italy --- University of Molise, ItalyIn tropical countries, frequent anthropogenic disturbances are primary drivers of the reduction in community diversity and local extinction of many insect taxa, including Lepidoptera. We assessed the impact of anthropogenic disturbances on lepidopteran assemblages across five different land use types... -
Geographical and seasonal patterns in the diet of Cape fur seals Arctocephalus pusillus pusillus in Namibia, based on extensive scat analyses
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: DN Mwaala --- University of Namibia, Namibia MR Wilhelm --- University of Namibia, Namibia SP Kirkman --- Fisheries and the Environment (DFFE): Branch Oceans and Coasts, South Africa J-P Roux --- Ministry of Fisheries and Marine Resources, NamibiaNamibia's population of Cape fur seals Arctocephalus pusillus pusillus is a major constituent of top predator biomass in the northern Benguela upwelling system. Understanding their diet is key to comprehending their role in the ecosystem and potential drivers of recent... -
Secondary vegetation provides a reservoir of non-timber forest products and agroforestry service options for forestry plantation systems, Maputaland, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: AP Starke --- University of Pretoria, South Africa CJ Geldenhuys --- University of Pretoria, South Africa TG O’Connor --- University of the Witwatersrand, South Africa CS Everson --- University of KwaZulu-Natal, South AfricaTree species providing non-timber forest products (NTFPs) have the potential to enhance the socio-economic value of forestry plantation systems and mitigate biodiversity loss associated with production landscapes in Southern Africa. This can be accomplished by integrating NTFP agroforestry systems with... -
Effects of land-use change on the provisioning ecosystem service of wetlands: the case of a social-ecological systems perspective of Boyo Wetland in Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Tuji --- Stellenbosch University, South Africa S.M. Jacobs --- Stellenbosch University, South Africa R.R. Malgas --- Stellenbosch University, South Africa K Dzama --- Stellenbosch University, South Africa T Alamirew --- Addis Ababa University, EthiopiaWetlands are catchment life support systems with diverse ecological and socio-economic functions. They have played a significant role in the growth of African human civilisations and cultural development, and today contribute billions of US dollars’ worth of ecosystem services to... -
How do entrepreneurs succeed in challenging economic environments in Africa? Case study evidence from Ghana
Item type: Journal Article • Journal: Africa Journal of Management • Authors: Christopher J. Rees --- University of Manchester, UK Irene Okhade --- University of Manchester, UK Kate E. Rowlands --- University of Manchester, UKThe main aim of the study is to explore aspects of entrepreneurs’ motivation and perceptions with reference to prevailing values in a given context in Africa. In the initial sections of the paper, we draw on concepts of entrepreneurship and... -
Strong soil–vegetation relationship in riparian forests of the middle Rio Doce watershed, south-eastern Brazil
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Débora Oliveira Sousa --- Universidade Federal de Minas Gerais, Brazil Daniel Negreiros --- Universidade Federal de Minas Gerais, Brazil Letícia Ramos --- Universidade Federal de Minas Gerais, Brazil João Carlos Gomes Figueiredo --- Universidade Estadual de Montes Claros, Brazil Dario C Paiva --- Institute of Environment, Florida International University, USA Yumi Oki --- Universidade Federal de Minas Gerais, Brazil Wénita de Souza Justino --- Universidade Federal de Minas Gerais, Brazil Rubens Manoel dos Santos --- Universidade Federal de Lavras, Brazil Lorena Ashworth --- Universidade Federal de Minas Gerais, Brazil Yule Roberta Ferreira Nunes --- Universidade Estadual de Montes Claros, Brazil G Wilson Fernandes --- Universidade Federal de Minas Gerais, BrazilPhytosociological surveys and soil quality studies are relevant tools for the implementation of restoration programmes. This study aimed to characterise the vegetation of the tree and sapling strata in preserved riparian forests of the middle portion of the Rio Doce... -
The use of suitability models and remote sensing to map forest suitability: a systematic review
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Mthokozisi Ndumiso Mzuzuwentokozo Buthelezi --- University of KwaZulu-Natal, South Africa Romano Trent Lottering --- University of KwaZulu-Natal, South Africa Kabir Yunus Peerbhay --- University of KwaZulu-Natal, South Africa Onisimo Mutanga --- University of KwaZulu-Natal, South AfricaThe rapid decline of vegetated landscapes jeopardises vital ecosystem services underpinning climate change mitigation efforts. Restoring and repurposing these landscapes presents a powerful opportunity to recover lost services and strengthen the fight against climate change. This study undertook a comprehensive... -
Floristic and structural changes in a neotropical urban novel forest over 13 years
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Marcelly de Souza Ventura --- Universidade Federal de Juiz de Fora, Brazil Thales Castilhos de Freitas --- Universidade Federal de Juiz de Fora, Brazil Ricardo Montianele de Castro --- Universidade Federal de Juiz de Fora, Brazil Mariana Couto Cruz --- Universidade Federal de Juiz de Fora, Brazil Kelly Antunes --- Universidade Federal de Juiz de Fora, Brazil Taísa Nascimento de Souza --- Universidade Federal de Juiz de Fora, Brazil Breno Moreira --- Universidade Federal de Juiz de Fora, Brazil Fabrício Alvim Carvalho --- Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora, BrazilThe ecological importance of non-native species is the main characteristic of novel ecosystems. Pinus elliottii species is highly invasive in tropical forests and is commonly found in secondary forests in Brazil. We investigated the floristic and structural changes in an... -
Colonisation patterns and reef growth of the invasive serpulid Ficopomatus enigmaticus in a Greek coastal lagoon
Item type: Journal Article • Journal: African Zoology • Authors: Athanasia-Violeta Ntzoumani --- University of Patras, Greece Sarah Faulwetter --- University of Patras, Greece Konstantinos G Nikolakopoulos --- University of Patras, Greece Pavlos Avramidis --- University of Patras, Greece Alexis Ramfos --- University of Patras, GreeceThe reef-building serpulid polychaete Ficopomatus enigmaticus is an invasive species in brackish waters in tropical and temperate zones worldwide and often has massive impacts on ecosystems and anthropogenic activities. In Prokopos Lagoon in Greece, the species has constructed large reefs... -
Overlooked forbs: implications for rangeland biodiversity and function in southern Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Sindiso Nkuna --- University of KwaZulu-Natal, South Africa Craig Morris --- University of KwaZulu-Natal, South AfricaForbs are a diverse component of grassy ecosystems, offering various vital ecosystem services while enhancing system resilience. However, herbaceous non-grass species are not routinely enumerated, nor their significance evaluated. We examined the extent to which grassland forbs have been considered... -
Cross-realm biodiversity profile of the South African coastal zone
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LR Harris --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa JB Adams --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa A Dayaram --- Kirstenbosch Research Centre, South African National Biodiversity Institute (SANBI), South Africa LV Dunga --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa N Job --- Kirstenbosch Research Centre, South African National Biodiversity Institute (SANBI), South Africa SP Kirkman --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa SJ Lamberth --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa MC Pfaff --- University of Cape Town, South Africa JL Raw --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa GM Rishworth --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa A Robbins --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa KJ Sink --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa AL Skowno --- Kirstenbosch Research Centre, South African National Biodiversity Institute (SANBI), South Africa H van Deventer --- Council for Scientific and Industrial Research (CSIR), South Africa L van Niekerk --- Institute for Coastal and Marine Research, Nelson Mandela University, South AfricaSouth Africa’s coast is 3 113 km long and includes microtidal shores that experience semi-diurnal tides and mostly high wave energy. From west to east, the cool Benguela Current and the warm Agulhas Current drive steep gradients in climate and... -
Littoral substrates and nest properties of Coptodon rendalli vary with distance from the shoreline in a tropical impoundment, southeast Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: RJ Chateya --- National University of Science and Technology, Zimbabwe HGT Ndagurwa --- National University of Science and Technology, ZimbabweThe change in littoral substrates and Coptodon rendalli nest properties along the inshore–offshore gradient of Mushandike Dam in southeast Zimbabwe, impacted by long-term water-level fluctuations, were studied in March 2016. Substrate and nest properties were measured in four contiguous 25... -
Assessment of the inland wetland ecosystem types in South Africa: threats and protection
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: H van Deventer --- Council for Scientific and Industrial Research (CSIR), South Africa Jeanne L Nel --- , The NetherlandsEcosystem threat status (ETS) and ecosystem protection levels (EPLs) are headline indicators that can assess freshwater ecosystems at a country-wide scale. A spatial layer of freshwater, inland wetland ecosystem types of South Africa was combined with a range of spatial... -
Allometric biomass estimations for Senegalia mellifera and Vachellia reficiens
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Jerome M Boys --- Namibia University of Science and Technology, Namibia Gert N Smit --- University of the Free State, South Africa Paul J Malan --- University of the Free State, South AfricaA well established tool that is able to provide a detailed estimation of the leaf and wood biomass of woody plants is the third version of the Biomass Estimate from Canopy Volume (BECVOL3) model. An Excel-based biomass quantification tool is... -
Evaluating the histopathology, condition index and stress-on-stress response of caged brown mussels Perna perna for monitoring marine coastal pollution in Senegal
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: F Tabane --- Centre Régional de Recherche en Écotoxicologie et Sécurité Environnementale (CERES-Locustox), Unité Biologie, Senegal F Cazier --- Centre Commun de Mesures, Université du Littoral Côte d’Opale, France D Dewaélé --- Centre Commun de Mesures, Université du Littoral Côte d’Opale, France K Hylland --- University of Oslo, Norway CT Ba --- Université Cheikh Anta Diop, Senegal M Fall --- Université Cheikh Anta Diop, SenegalThis study is the first in a coastal West African country to evaluate the histopathology, condition index and stress-on-stress response time of caged brown mussels Perna perna for use in pollution monitoring of coastal ecosystems. Perna perna collected from an... -
Impact of land use changes on soil physical quality in southeastern Tigray, Ethiopia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Araya Kahsay --- Adigrat University, Ethiopia Mitiku Haile --- Mekelle University, Ethiopia Girmay Gebresamuel --- Mekelle University, Ethiopia Muktar Mohammed --- Oda-Bultum University, EthiopiaThis study evaluates the effects of land use changes on soil physical quality in southeastern Tigray, northern Ethiopia, using the visual evaluation of soil structure (VESS) method. Soil samples were collected from cropland, grassland, and shrubland sites during two field... -
Effects of diamond mining on sandy beaches in southern Namibia – the use of Tylos granulatus (Isopoda: Oniscidea) as an indicator species
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Hutchings --- , South Africa A Rees --- , South Africa A Pulfrich --- , South Africa BM Clark --- , South AfricaSandy beaches provide vital ecosystem services and support diverse ecological communities but are increasingly threatened by anthropogenic pressures. In particular, intertidal mining disrupts sandy beaches and challenges their resilience, yet these ecosystems retain some capacity for environmental recovery. This study... -
Macro-level determinants of research output in Nigerian knowledge institutions: A case study of ICT researchers
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Bolanle A. Adewusi --- , Canada Oluseye Jegede --- University of Johannesburg, South AfricaThis study explores the factors that influence ICT research productivity across Nigerian universities and government research agencies. Using a mixed-methods approach, the research combines conceptual analysis with quantitative techniques, drawing on the PESTLE model, the Entrepreneurship Ecosystem, and the Triple... -
Exploring the strategies shaping application programming interface development and integration in digital music platforms: A qualitative case study
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Joshua Ofoeda --- University of Professions Studies, Ghana Richard Boateng --- University of Ghana, Ghana Choudrie Jyoti --- University of Hertfordshire, UK John Effah --- University of Ghana, GhanaApplication Programming Interfaces (APIs) have become essential to contemporary software development, supporting the growth of digital platforms and ecosystems. APIs enable developers to create applications by providing functionalities that facilitate communication. Despite their importance in supporting digital platforms and ecosystems,... -
High adult mortality of African Penguins Spheniscus demersus in South Africa after 2004 was likely caused by starvation
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Robert JM Crawford --- Fisheries and the Environment, South Africa Richard B Sherley --- Environment and Sustainability Institute/Centre for Ecology and Conservation, University of Exeter, United Kingdom Lynne J Shannon --- University of Cape Town, South Africa Alistair M McInnes --- BirdLife South Africa, South Africa Tegan Carpenter-Kling --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa Azwianewi B Makhado --- Fisheries and the Environment, South AfricaFrom 2004–2011, following the collapse of sardine Sardinops sagax, a main food for African Penguins Spheniscus demersus, to < 25% of its maximum recorded abundance, survival of penguins breeding at Dassen and Robben islands, north of Cape Town, South Africa... -
Horizon scanning to identify priority research questions for the South African marine shore-based recreational fishery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Hewett --- Rhodes University, South Africa CS Bova --- Rhodes University, South Africa EC Butler --- Rhodes University, South Africa A-R Childs --- Rhodes University, South Africa MW Farthing --- Rhodes University, South Africa BQ Mann --- Rhodes University, South Africa JB Mann-Lang --- Rhodes University, South Africa AC Winkler --- Rhodes University, South Africa K Hyder --- Centre for Environment Fisheries and Aquaculture Science, United Kingdom WM Potts --- Rhodes University, South AfricaThe marine shore-based recreational fishery (MSBRF) is the largest sector of the South African linefishery. The high rate of participation, widely dispersed effort, the diversity of motivations, attitudes and perceptions of its participants, and the large number of target species... -
Invasion of Neltuma juliflora (mesquite) and its effects on soil physicochemical properties in a semi-arid rangeland of South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Siviwe Odwa Malongweni --- Sol Plaatje University, South AfricaInvasive species threaten ecosystem functions in African rangelands by altering soil properties, and affecting overall health and productivity. This study compared soil physicochemical characteristics under invasive Neltuma juliflora and native Vachellia karroo across two zones (beneath tree canopy versus open... -
Breeding population status and nesting preferences of the White-backed Vulture Gyps africanus in western Serengeti, northern Tanzania
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Vainess Laizer --- Department of Wildlife Management, College of Forestry, Wildlife and Tourism, Sokoine University of Agriculture, Tanzania Peter S Goodman --- Grumeti Fund, Tanzania Noel Mbise --- Grumeti Fund, Tanzania Claire Bracebridge --- The Peregrine Fund, The World Center for Birds of Prey, United States Kate Tiedeman --- Max Planck Institute for Animal Behavior, Germany Corrine J Kendall --- The Peregrine Fund, The World Center for Birds of Prey, United States Robert Byamungu --- Department of Wildlife Management, College of Forestry, Wildlife and Tourism, Sokoine University of Agriculture, Tanzania Shombe N Hassan --- Department of Wildlife Management, College of Forestry, Wildlife and Tourism, Sokoine University of Agriculture, Tanzania Kristen D Snyder --- Grumeti Fund, TanzaniaThe White-backed Vulture Gyps africanus is Critically Endangered because of its decline across its range in Africa, largely due to poisoning. The western corridor of the Serengeti ecosystem in northern Tanzania hosts a significant number of individuals of this species... -
Growth potential and productivity of the green macroalgae Ulva reticulata in a sustainable farming system in a coastal lagoon at Bambous Virieux, Mauritius
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: N Nazurally --- Department of Agricultural and Food Science, University of Mauritius, Mauritius D Beehary-Panray --- Environmental Protection and Conservation Organisation (EPCO), Resilient Island Endeavour (RISE) Project, Mauritius EC Gatteschi --- Cooperazione Internazionale Sud Sud (CISS), Resilient Island Endeavour (RISE) Project, ItalyUlva reticulata is a fast-growing green macroalga with high bioremediation and economic potential. Cultivation of this seaweed at Bambous Virieux in southeast Mauritius was undertaken to evaluate its growth potential and biological feasibility in a tropical lagoon. Over a 30-day... -
Comparing fixed count and observed/expected taxa approaches in diatom-based water quality assessment: implications for monitoring efficiency and accuracy
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Holmes --- Africa Earth Observatory Network (AEON) – Earth Stewardship Science Research Institute (ESSRI), Nelson Mandela University, South Africa JC Taylor --- Unit for Environmental Sciences and Management (UESM), North-West University, South Africa B Linol --- Africa Earth Observatory Network (AEON) – Earth Stewardship Science Research Institute (ESSRI), Nelson Mandela University, South AfricaDiatom-based indices are widely used for freshwater bioassessment, yet methodological variability, particularly in count strategies, can influence ecological classification outcomes. This study compares a traditional fixed count (FC) approach with an observed/expected taxa (OE) strategy across five riverine sites in... -
Seeds of cooperation, fruits of innovation: Understanding the Iranian vaccine industry in the COVID-19 pandemic-era through the lens of the innovation ecosystem
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Mitra Aminlou --- Allameh Tabataba'i University, Iran Soroush Ghazinoori --- Allameh Tabataba'i University, Iran Mehdi Goodarzi --- Allameh Tabataba'i University, Iran Mahdi Elyasi --- Allameh Tabataba'i University, Iran Mostafa Ghanei --- Baqiyatallah University of Medical Sciences, IranThe COVID-19 pandemic highlighted the complexities of vaccine industry innovation. This study aims to understand how Iran’s vaccine industry rapidly responded to the COVID-19 pandemic under severe sanctions by applying an innovation ecosystem-as-structure framework. It addresses two research objectives: identifying...