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ON THE RELATIONSHIP BETWEEN TIGERFISH AND SARDINES IN LAKE KARIBA
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: B.E. Marshall --- Department of Biological Sciences, ZimbabweThere was a clear relationship in Lake Kariba between the abundance of young-of-the-year (0+) tigerfish and the sardines on which they prey. The abundant sardine population that existed before commercial fishing began accounted for the increase in tiger-fish which occurred... -
The distribution and relative abundance of stream fishes in the upper Manyame River, Zimbabwe, in relation to land use, pollution and exotic predators
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: B Gratwicke --- Department of Biological Sciences, Zimbabwe BE Marshall --- Department of Biological Sciences, Zimbabwe T Nhiwatiwa --- Department of Biological Sciences, ZimbabweA survey of the upper Manyame River catchment, middle Zambezi system, Zimbabwe, yielded a total of 22 fish species from 48 stations. The most widespread species (present at >20 stations) were Marcusenius macrolepidotus, Barbus paludinosus, Labeo cylindricus, Clarias gariepinus and... -
The effect of largemouth bass Micropterus salmoides on aquatic macro-invertebrate communities in the Wit River, Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PSR Weyl --- Department of Zoology and Entomology, South Africa FC de Moor --- Department of Zoology and Entomology, South Africa MP Hill --- Department of Zoology and Entomology, South Africa OLF Weyl --- , South AfricaFish predation is one of the driving forces of freshwater invertebrate community structures, with alien predators having a pronounced effect. A quantitative assessment of aquatic invertebrates in the Wit River, Sundays River catchment, Eastern Cape, South Africa, was undertaken to... -
The burrowing behaviour of Bulinus nyassanus, intermediate host of Schistosoma haematobium, in Lake Malaŵi
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: H Madsen --- DBL Centre for Health Research and Development, Faculty of Life Sciences, JR Stauffer --- School of Forest Resources, USAThere is evidence that transmission of Schistosoma haematobium has increased in some areas in the southern part of Lake Malaŵi, where transmission occurs both along open shorelines and at inland sites. Transmission along open shores in the lake is via... -
Rapid colonisation of artificial substrates by macroinvertebrates in a South African lentic environment
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AJ Booth --- Department of Ichthyology and Fisheries Science, South Africa WT Kadye --- Department of Ichthyology and Fisheries Science, South Africa T Vu --- Department of Ichthyology and Fisheries Science, South Africa M Wright --- Department of Ichthyology and Fisheries Science, South AfricaMacroinvertebrate colonisation patterns on artificial substrates were investigated in a small reservoir in the Eastern Cape, South Africa. Semi-closed 1 000 cm3 polythene netting cages filled with either brick, gravel, shredded plastic, or equal proportions of these three materials, were... -
ON THE RELATIONSHIP BETWEEN TIGERFISH AND SARDINES IN LAKE KARIBA
Item type: Journal Article • Journal: Southern African Journal of Child and Adolescent Mental Health • Authors: B.E. Marshall --- Department of Biological Sciences, ZimbabweThere was a clear relationship in Lake Kariba between the abundance of young-of-the-year (0+) tigerfish and the sardines on which they prey. The abundant sardine population that existed before commercial fishing began accounted for the increase in tiger-fish which occurred... -
Consideration of multispecies interactions in the Antarctic: a preliminary model of the minke whale – blue whale – krill interaction
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M. Mori D. S. ButterworthAs a first step in investigating the major predator–prey interactions in the Antarctic, a model describing blue whales Balaenoptera musculus, minke whales Balaenoptera acutorostrata and krill Euphausia superba is developed. Blue and minke whales feed mainly on krill, and they... -
The diet of the ragged-tooth shark Carcharias taurus Rafinesque 1810 in the Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MJ SmaleThe ragged-tooth shark Carcharias taurus is a large predator of inshore coastal waters in the Eastern Cape, South Africa. Born at about 1m long and attaining approximately 3m, stomach content analyses have shown that it feeds largely on teleosts and... -
Ecosystem considerations of the KwaZulu-Natal sardine run
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Hutchings --- Oceans and Coasts, Department of Environmental Affairs, South Africa T Morris --- Bayworld, Port Elizabeth Museum, South Africa CD van der Lingen --- Marine Research Institute, South Africa SJ Lamberth --- Branch Fisheries, Department of Agriculture, South Africa AD Connell --- , South Africa S Taljaard --- , South Africa L van Niekerk --- , South AfricaThe annual winter sardine run along the South African east coast impacts the KwaZulu-Natal (KZN) coastal system in a variety of ways. These include ecological impacts, such as enrichment of a largely oligotrophic environment, competition between migrant sardine Sardinops sagax,... -
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... -
The effect of fish predation on benthic macroinvertebrates in a seasonal stream in north-western Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Albert Chakona Brian Marshall Luc BrendonckThe cumulative impact of the entire fish assemblage on benthic macroinvertebrate assemblages was investigated over four months in a removal experiment in isolated pools that persist through the dry season, in an intermittent stream in north-western Zimbabwe. Macroinvertebrate taxonomic richness... -
Influence of largemouth bass, Micropterus salmoides, on abundance and habitat selection of Cape galaxias, Galaxias zebratus, in a mountain stream in the Cape Floristic Region, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JM Shelton JA Day CL GriffithsPredatory alien fishes have been widely introduced into streams in the Cape Floristic Region (CFR), South Africa, but little is known about their effect on native fishes. Results from this 2006 study suggest that the presence of alien predatory largemouth... -
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... -
Predation by introduced largemouth bass Micropterus salmoides on indigenous marine fish in the lower Kowie River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: ML Magoro --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa AK Whitfield --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa L Carassou --- Department of Zoology and Entomology, South AfricaThe predatory impact of introduced largemouth bass Micropterus salmoides on the juveniles of estuary-associated indigenous marine fish species in the lower Kowie River and estuary headwaters was investigated in 2012–2013. Stomach contents and stable isotope analyses were employed to assess... -
Aggressive behaviour of an adult male Cape fur seal (Arctocephalus pusillus pusillus) towards a great white shark (Carcharodon carcharias)
Item type: Journal Article • Journal: African Zoology • Authors: C.L. Stewardson --- Division of Botany and Zoology, Australian National University, Australia M. Brett --- Robberg Nature Reserve, South AfricaThis is a report of a marine predator (the white shark) being threatened by a member of the species on which it preys (a male Cape fur seal). Although these events may be rarely observed or occur infrequently, they may... -
The predator defence system of an African king cricket (Orthoptera: Anostostomatidae): does it help to stink?
Item type: Journal Article • Journal: African Zoology • Authors: Stephan Wolf --- Department of Zoology and Entomology, South Africa Helene Brettschneider --- Department of Zoology and Entomology, South Africa Philip W. Bateman --- Department of Zoology and Entomology, South AfricaWe examined the putative defence system of a king cricket, Onosandrus sp., in particular the efficacy of the noxious faeces against two types of predator: a lizard, the skink Mabuya striata (an active, diurnal forager), and the toad Bufo gutturalis... -
Do Cape ground squirrels (Xerus inauris) discriminate between olfactory cues in the faeces of predators versus non-predators?
Item type: Journal Article • Journal: African Zoology • Authors: Lydia E. Belton --- Department of Zoology and Entomology, South Africa Nick Ball --- Department of Zoology and Entomology, South Africa Jane M. Waterman --- Department of Biology, U.S.A. Philip W. Bateman --- Department of Zoology and Entomology, South AfricaOne way to avoid potential predators is to be sensitive to odour cues, particularly those in faeces and urine, left by predators. This sensitivity has been demonstrated in many solitary, nocturnal, small mammals which may fall victim to ambush predators.We... -
Predator control, mesopredator release, and impacts on bird nesting success: a field test
Item type: Journal Article • Journal: African Zoology • Authors: Penn Lloyd --- Percy FitzPatrick Institute, DST/NRF Centre of Excellence, University of Cape Town, South AfricaThe mesopredator release hypothesis predicts that reductions in top-predator abundance in a community will increase the abundance or activity of smaller ‘mesopredators’, and increase predation pressure on mesopredator prey, including bird nests. Top predators have been extensively controlled in rangelands... -
Lion predation on elephants in the Savuti, Chobe National Park, Botswana
Item type: Journal Article • Journal: African Zoology • Authors: R. John Power --- Carnivore Conservation Group, Endangered Wildlife Trust, De Beers Venetia Limpopo Nature Reserve, South Africa R. X. Shem Compion --- Carnivore Conservation Group, Endangered Wildlife Trust, De Beers Venetia Limpopo Nature Reserve, South AfricaLions rarely prey on elephants. Botswana‘s Savuti lions, however, switch to preying on elephants during the late dry season (August–November), and the frequency of this has increased in the last two decades (1985–2005). An opportunity to document this phenomenon was... -
Characteristics of the alarm calls of buff-streaked chat groups and African stonechat pairs in response to increased distances from surrogate raptors and snakes
Item type: Journal Article • Journal: African Zoology • Authors: N. Seoraj-Pillai --- Department of Nature Conservation, South Africa G. Malan --- Department of Nature Conservation, South AfricaMany animals emit alarm calls in response to a potential predator. These calls may transmit information about predator type and response urgency. This study compared the alarm calls of the social buff-streaked chat, Oenanthe bifasciata, to the asocial African stonechat,... -
Preliminary evaluation of the impact of invasive smallmouth bass Micropterus dolomieu on native fish abundance in the Witte River, Cape Floristic Region, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Jeremy M. Shelton --- Department of Biological Sciences, South Africa Jenny A. Day --- Department of Biological Sciences, South Africa N. Dean Impson --- CapeNature Scientific Services, South AfricaThe impact of invasive smallmouth bass, Micropterus dolomieu, on the abundance of two native fish species, Breede River redfin, Pseudobarbus burchelli, and Cape kurper, Sandelia capensis, was investigated in the Witte River tributary of the Breede River in South Africa’s... -
Food abundance explains the breeding season of a tropical shorebird, the Crab Plover Dromas ardeola
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Giuseppe De Marchi --- Dipartimento di Scienze della Terra e dell'Ambiente, Italy Giorgio Chiozzi --- Museo Civico di Storia Naturale, Italy Dawit Semere --- Research Division, Eritrea Yohannes Mebrahtu --- Research Division, Eritrea Farhad Hosseini Tayefeh --- Department of the Environment Provincial Office, Iran Mohammed Almalki --- Department of Biology, College of Science, Kingdom of Saudi Arabia Mauro Fasola --- Dipartimento di Scienze della Terra e dell'Ambiente, ItalyThe timing of breeding in birds is a life-history trait that generally depends on food availability, but other factors may play a role, particularly in tropical areas where food availability is less seasonal than in temperate or polar areas. We... -
Costs associated with tail autotomy in an ambush foraging lizard, Cordylus melanotus melanotus
Item type: Journal Article • Journal: African Zoology • Authors: Suzanne McConnachie --- Communication and Behaviour Research Group, School of Animal, Plant and Environmental Sciences, South Africa Martin J. Whiting --- Communication and Behaviour Research Group, School of Animal, Plant and Environmental Sciences, South AfricaTail autotomy is a widespread method of escape among lizards and can be costly. Most studies on the effects of tail loss have focused on active foraging lizards, but few data exist for ambush foraging lizards. We investigated potential costsassociated... -
Near-shore distribution of Heaviside’s (Cephalorhynchus heavisidii) and dusky dolphins (Lagenorhynchus obscurus) at the southern limit of their range in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: S.H. Elwen --- Mammal Research Institute, University of Pretoria, South Africa M. Thornton --- Mammal Research Institute, University of Pretoria, 0001 Pretoria c/o Iziko South African Museum, South Africa D. Reeb --- Mammal Research Institute, University of Pretoria, South Africa P.B. Best --- Mammal Research Institute, University of Pretoria, 0001 Pretoria c/o Iziko South African Museum, South AfricaPhoto-identification surveys over three years along 390 km of coastline north of Cape Town, revealed that Heaviside’s dolphin distribution was consistent between years and higher in areas more exposed to swells and with greater long-term availability of small hake Merluccius... -
Trophic relationships of hake (Merluccius capensis and M. paradoxus) and sharks (Centrophorus squamosus, Deania calcea and D. profundorum) in the Northern (Namibia) Benguela Current region
Item type: Journal Article • Journal: African Zoology • Authors: Johannes A Iitembu --- Department of Fisheries and Aquatic Sciences, Namibia Nicole B Richoux --- Department of Zoology and Entomology, South AfricaThe trophic relationships of two hake species (Merluccius capensis and M. paradoxus) and three shark species (Centrophorus squamosus, Deania calcea and D. profundorum) were investigated using nitrogen and carbon stable isotope signatures (δ15N and δ13C) of their muscle tissues. The... -
Macroinvertebrate communities associated with duckweed (Lemnaceae) in two Eastern Cape rivers, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PC Muskett --- Department of Zoology and Entomology, South Africa JM Hill --- Department of Zoology and Entomology, South Africa PSR Weyl --- Department of Zoology and Entomology, South AfricaThe functional feeding groups and diversity of macroinvertebrate communities associated with duckweed mats in the New Years River (two sites) and Bloukrans River (two sites), Eastern Cape province, South Africa, were assessed. Duckweed (Lemnaceae) is a ubiquitous family of floating... -
Assessing trophic adaptability is critical for understanding the response of predatory fishes to climate change: a case study of Pomatomus saltatrix in a global hotspot
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WM Potts --- Department of Ichthyology and Fisheries Science, South Africa RSJ Bealey --- Department of Ichthyology and Fisheries Science, South Africa A-R Childs --- Department of Ichthyology and Fisheries Science, South AfricaThere is a growing need to incorporate biotic interactions, particularly those between predators and their prey, when predicting climate-driven shifts in marine fishes. Predators dependent on a narrow range of prey species should respond rapidly to shifts in the distribution... -
Is the Black Harrier Circus maurus a specialist predator? Assessing the diet of a threatened raptor species endemic to southern Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Marie-Sophie Garcia-Heras --- Percy FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, South Africa François Mougeot --- Instituto de Investigación en Recursos Cinegéticos (IREC), Spain Beatriz Arroyo --- Instituto de Investigación en Recursos Cinegéticos (IREC), Spain Graham Avery --- Iziko South African Museum, South Africa Margaret Avery --- Iziko South African Museum, South Africa Robert E Simmons --- Percy FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, South AfricaStudying the diet of wild animals is central for understanding their flexibility in food requirements. The Black Harrier Circus maurus is an endangered raptor in South Africa and Namibia. To date, information about the diet of the species is insufficient... -
Variation in the daily activity, movement and refugia of Critically Endangered geometric tortoises, Psammobates geometricus, in autumn and spring
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Brian T. Henen --- , , South Africa Ulric P. van Bloemestein --- , , South Africa Margaretha D. Hofmeyr --- , , South Africa Craig A. Weatherby --- , , USATo help assess habitat requirements of Critically Endangered geometric tortoises, we used thread-trailing to measure daily activity, movements and refugia of adult Psammobates geometricus in autumn and spring 2002. We found strong differences between seasons, and effects of weather, individuals... -
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... -
Reflection on the first five years of South Africa’s Acoustic Tracking Array Platform (ATAP): status, challenges and opportunities
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa RH Bennett --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa A-R Childs --- Department of Ichthyology and Fisheries Science, South Africa TS Murray --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaThe Acoustic Tracking Array Platform (ATAP) is a marine science programme that monitors the movements and migrations of inshore marine animals along the South African coastline. Acoustically tagged animals are monitored by an expanded network of approximately 100 automated data-logging... -
Quantifying the largest aggregation of giant trevally Caranx ignobilis (Carangidae) on record: implications for management
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Daly --- Port Elizabeth Museum at Bayworld, South Africa CAK Daly --- Save Our Seas Foundation (SOSF) D’Arros Research Centre, Switzerland RH Bennett --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa MAM Pereira --- Centro Terra Viva, Mozambique JD Filmalter --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaThe giant trevally Caranx ignobilis (Forsskål) is an important apex predatory fish typically associated with coral reef communities. It is prized in recreational and commercial fisheries, yet little is known about its aggregation dynamics and susceptibility to fishing pressure. This... -
Impact of shorebird predation on intertidal macroinvertebrates in a key North African Atlantic wintering site: an experimental approach
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Joulami --- Faculty of Sciences Ben M’sik, Morocco R El Hamoumi --- Faculty of Sciences Ben M’sik, Morocco Z Daief --- Faculty of Sciences Ain Chock, Morocco H Bazairi --- Faculty of Sciences, Morocco RJ Lopes --- Centro de Investigação em Biodiversidade e Recursos Genéticos (CIBIO), InBio Laboratório Associado, PortugalShorebirds, as migratory aquatic birds and top predators in intertidal ecosystems, can be affected by global environmental changes and escalations in local impacts on coastal lagoons and estuarine trophic networks. Many shorebirds winter in North African Atlantic coastal sites, most... -
Crayfish, catfish and snails: the perils of uncontrolled biological control
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BE Marshall --- Great North Road, New ZealandA recent proposal that the Australian redclaw crayfish Cherax quadricarinatus and hybrid catfish could potentially control the snail hosts of schistosomiasis has been criticised on the grounds that crayfish pose a severe threat to aquatic ecosystems into which it might... -
Brown hyaena (Parahyaena brunnea) diet composition from Zingela Game Reserve, Limpopo Province, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: J Philip B Faure --- Department of Nature Conservation, George South Africa Nadine J Holmes --- Primate and Predator Project, Lajuma Research Centre, South Africa Lawrence H Watson --- Department of Nature Conservation, George South Africa Russell A Hill --- Primate and Predator Project, Lajuma Research Centre, South AfricaBrown hyaenas Parahyaena brunnea are classified as ‘Near Threatened’. Although predominantly scavengers, they are frequently blamed for livestock depredations leading to persecution. Information on brown hyaena diets is important for understanding the degree of potential conflict with farming livelihoods and... -
The diet and trophic ecology of non-native Micropterus salmoides in two South African impoundments
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GC Taylor --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa JM Hill --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa OLF Weyl --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaLargemouth bass Micropterus salmoides is a highly successful predator that preys on fish and invertebrates. Highly popular with anglers, it is one of the most introduced and invasive fish globally, with strong potential to alter ecosystem structure and functioning. A... -
A snapshot assessment of the diet of Cape fur seals Arctocephalus pusillus pusillus at Ilha dos Tigres, Angola
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Winkler --- Department of Ichthyology and Fisheries Science, South Africa S Mannheim --- Department of Ichthyology and Fisheries Science, South Africa A-R Childs --- Department of Ichthyology and Fisheries Science, South Africa C Santos --- Biologia Faculdade de Ciências, Angola C de Beer --- Department of Ichthyology and Fisheries Science, South Africa MJ Smale --- Department of Zoology and Institute for Coastal and Marine Research, South Africa WM Potts --- Department of Ichthyology and Fisheries Science, South AfricaThe population of Cape fur seal Arctocephalus pusillus pusillus at Ilha dos Tigres off the coast of southern Angola is expanding. Until now the only available biological information on the population has been its demographic parameters, and this insufficiency has... -
Identification of land predators of African Penguins Spheniscus demersus through post-mortem examination
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Ralph ET Vanstreels --- Marine Apex Predator Research Unit, Institute for Coastal and Marine Research, South Africa Nola J Parsons --- Southern African Foundation for the Conservation of Coastal Birds, South Africa Cuan McGeorge --- Stony Point Nature Reserve, South Africa Renata Hurtado --- Southern African Foundation for the Conservation of Coastal Birds, South Africa Katrin Ludynia --- Southern African Foundation for the Conservation of Coastal Birds, South Africa Lauren Waller --- Southern African Foundation for the Conservation of Coastal Birds, South Africa Monique Ruthenberg --- Hottentots Holland Nature Reserve, South Africa Arne Purves --- Environmental Management Department, Transport and Urban Development Authority, South Africa Lorien Pichegru --- Marine Apex Predator Research Unit, Institute for Coastal and Marine Research, South Africa Pierre A Pistorius --- Marine Apex Predator Research Unit, Institute for Coastal and Marine Research, South AfricaThe African Penguin Spheniscus demersus is an endangered seabird endemic to southern Africa, and killing sprees by terrestrial predators have been one of the main threats for its mainland colonies. The methods employed to manage predators may differ depending on... -
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... -
Movements and growth rates of the broadnose sevengill shark Notorynchus cepedianus in southern Africa: results from a long-term cooperative tagging programme
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TM Engelbrecht --- , South Africa AA Kock --- , South Africa MJ O’Riain --- , South Africa BQ Mann --- , South Africa SW Dunlop --- , South Africa A Barnett --- , AustraliaTop predators are important components of healthy ecosystems but are at risk of overexploitation due to insufficient data on life-history characteristics and population dynamics to guide management. We investigated the movements and growth rates of the broadnose sevengill shark Notorynchus... -
Interspecific competition for cliff ledges on the Magaliesberg between nesting Verreaux’s Eagles and roosting Chacma baboons
Item type: Journal Article • Journal: African Zoology • Authors: G Malan --- , South Africa K Padayachee --- , South AfricaAnimals that share suitable rock ledges located on near-vertical cliff faces are compelled to interact when using this scarce resource. Because interspecific and exploitative competition for suitable ledges may have a vital influence on the survival and reproduction of Verreaux’s... -
Spatial and ontogenetic variability in the diet and trophic ecology of two co-occurring catsharks (Scyliorhinidae) off South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GM van der Heever --- , South Africa CD van der Lingen --- , South Africa RW Leslie --- , South Africa MJ Gibbons --- , South AfricaThe Izak catshark Holohalaelurus regani and the yellow-spotted catshark Scyliorhinus capensis both occur over the continental shelf around South Africa and are often caught together as bycatch in demersal trawls. Yet our understanding of their diet is fragmented, which makes... -
Intra-seasonal activity of ground dwelling spiders following six years of tillage, fertiliser and weeding treatments in an agricultural field in northern Zimbabwe
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Nilton Mashavakure --- , Zimbabwe Delight Vhembo --- , Zimbabwe Arnold B Mashingaidze --- , Zimbabwe Edson Gandiwa --- , ZimbabweSpiders are important biological control agents whose activity and diversity can be negatively affected by agricultural practices. A study was conducted at Chinhoyi University of Technology experimental farm, northern Zimbabwe, to determine the impact of tillage, fertiliser application and weeding... -
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... -
Predicted future changes in ocean temperature and pH do not affect prey selection by the girdled dogwhelk Trochia cingulata
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: N Martin --- , South Africa S Clusella-Trullas --- , South Africa TB Robinson --- , South AfricaPredator–prey relationships can drive community dynamics in marine systems, but it remains unclear how future changes in seawater temperatures and pH will influence these relationships. This study assessed the effect of predicted future temperatures and pH on the prey choice... -
Using the Kariba Invitation Tiger Fishing Tournament for monitoring an invasive crayfish Cherax quadricarinatus in Lake Kariba, Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LT Marufu --- , Zimbabwe C Phiri --- , Zimbabwe M Barson --- , Botswana T Nhiwatiwa --- , ZimbabweThe stomach contents of tigerfish Hydrocynus vittatus, caught in an angling competition on Lake Kariba, were examined to determine the extent to which they feed on the invasive crayfish Cherax quadricarinatus. The stomach contents of 281 tigerfish caught during three... -
Fear at the top: killer whale predation drives white shark absence at South Africa’s largest aggregation site
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AV Towner --- , South Africa RGA Watson --- , South Africa AA Kock --- , South Africa Y Papastamatiou --- , United States M Sturup --- , South Africa E Gennari --- , South Africa K Baker --- , South Africa T Booth --- , South Africa M Dicken --- , South Africa W Chivell --- , South Africa S Elwen --- , South Africa T Kaschke --- , South Africa D Edwards --- , South Africa MJ Smale --- , South AfricaRisk-induced fear effects exerted by top predators are pervasive in terrestrial and marine systems, with lasting impacts on ecosystem structure and function. The loss of top predators can disrupt ecosystems and trigger trophic cascades, but the introduction of novel apex... -
New records and a notable observation of potentially predator-avoiding amplectic behaviour in Boophis erythrodactylus from Madagascar
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Robin Kurian Abraham --- Biodiversity Institute and Department of Ecology and Evolutionary Biology, University of Kansas, United States Carl Richard Hutter --- Biodiversity Institute and Department of Ecology and Evolutionary Biology, University of Kansas, United StatesThe Red-fingered Bright-eyed Frog Boophis erythrodactylus is an endemic, range-restricted arboreal frog found only in the eastern rainforests of Madagascar. We report new localities for this species, along with locality records for its sister species B. tasymena, including localities where... -
A Bat Hawk Macheiramphus alcinus pair preyed primarily on bats and birds that forage in clutter-edge and open-air habitat groups
Item type: Journal Article • Journal: African Zoology • Authors: G Malan --- , South Africa E Harris --- , South Africa T Harris --- , South Africa A Monadjem --- , EswatiniThis study aimed to analyse the diet of a pair of Bat Hawks Macheiramphus alcinus, based on regurgitated pellets, and the associated habitat-foraging groups that the prey species belonged to. A total of 908 regurgitated pellets were collected from underneath... -
Predation on chameleons in Madagascar: a review
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Richard K. B. Jenkins --- School of Biological Sciences, University of Aberdeen, UK Jeanneney Rabearivony --- The Peregrine Fund, Madagascar Hajanirina Rakotomanana --- University of Antananarivo, MadagascarWe reviewed the diet of nocturnal and diurnal chameleon predators on Madagascar from the available literature and identified 28 species. Diurnal raptors were the main predators of chameleons, although the literature was biased towards birds and probably underestimated predation by... -
The Madagascan spiny-tailed iguana alters the sequence of anti-predator responses depending on predator types
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Ryo Ito --- Kyoto University, Japan Akira Mori --- Kyoto University, Kitashirakawa-Oiwakecho, JapanSome prey are able to avoid specific predators by altering defensive behaviours depending on predator type. In the Ampijoroa forest of Ankarafantsika National Park in Madagascar, Madagascan spiny-tailed iguanas (Oplurus cuvieri cuvieri) inhabit a species rich vertebrate community and are... -
Distribution and site fidelity of four endemic catshark species in Walker Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TL Johnson --- , South Africa JC de Bresser --- , South Africa E Cottrant --- , South Africa NJ Drobniewska --- , South Africa TG Paulet --- , South Africa LG Underhill --- University of Cape Town, South AfricaCatsharks (family Scyliorhinidae) and the recently reclassified deepwater catsharks (family Pentanchidae) are two of the largest families of elasmobranchs and include species that function as important mesopredators in almost all marine ecosystems. This study focuses on four species endemic to... -
The potential predators of pancake tortoises (Malacochersus tornieri) in Kenya
Item type: Journal Article • Journal: African Zoology • Authors: Jacob Mueti Ngwava --- Hainan Normal University, China Fanrong Xiao --- Hainan Normal University, China Patrick Kinyatta Malonza --- , Kenya Beryl Akoth Bwong --- , Kenya Hai-Tao Shi --- Hainan Normal University, ChinaStudying the interactions between prey and predators is crucial for understanding the intricacies of predator-prey dynamics and for formulating effective conservation strategies. Yet there is almost no systematic analysis of pancake tortoise predation, and its consequences on the tortoise populations... -
A reduced-parameter predator–prey model of soil formation from bedrock and biomass
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Animesh Samanta --- The Neotia University, India Priyanka Mandal --- The Neotia University, India Ayan Chatterjee --- The Neotia University, IndiaSoil–bedrock interaction on hillslopes is not well-studied, though it's affected by many physical and chemical factors. The aim of the present mathematical modelling study is to construct a model for soil formation utilising ordinary differential equations, all while reducing the...