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BEHAVIOUR OF A RADIO-TAGGED TILAPIA RENDALLI BOULENGER IN LAKE NGEZI, ZIMBABWE
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: CharlesH. Hocutt --- Horn Point Environmental Laboratories, United States of AmericaThe behaviour of a single specimen of Tilapia rendalli Boulenger was observed June through October 1986 in Lake Ngezi, Zimbabwe, by the use of a surgically-implanted radiotransmitter. The individual displayed a distinct homing response on two occasions, returning to the... -
Comparative behavioural assessment of an established and a new tigerfish Hydrocynus vittatus population in two man-made lakes in the Limpopo River catchment, southern Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GC O'Brien --- Water Research Group (Ecology), Unit for Environmental Science and Management, South Africa JB Bulfin --- , Ireland A Husted --- Centre for Aquatic Research, South Africa NJ Smit --- Water Research Group (Ecology), Unit for Environmental Science and Management, South AfricaWith the continued establishment of man-made lakes within the natural distribution range of tigerfish in southern Africa, many artificial tigerfish populations now exist in the region. Very little of the behavioural ecology of these artificial but ecologically important populations is... -
Evaluation of acoustic transmitter implantation and determination of post-translocation behaviour of largemouth bass Micropterus salmoides in a South African impoundment
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CF Huchzermeyer --- Department of Ichthyology and Fisheries Science (DIFS), South Africa OLF Weyl --- , South Africa PD Cowley --- , South AfricaLargemouth bass Micropterus salmoides are an important angling species that are often displaced during catch-and-release fishing tournaments. The impact of acoustic transmitter implantation on this species and the effect of displacement distance on their behaviour were tested. In April 2010,... -
Foraging of a coastal seabird: flight patterns and movements of breeding Cape gannets Morus capensis
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: NJ Adams RA NavarroCape gannets Morus capensis are predatory seabirds in the coastal waters of southern Africa where they feed on commercially important fish species. Using a combination of intensive monitoring at nest sites, tracking of radio-tagged birds and diet sampling, we determined... -
A telemetry experiment on spotted grunter Pomadasys commersonnii in an African estuary
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SE Kerwath A Götz PD Cowley WHH Sauer C AttwoodThe feasibility of using telemetry equipment to study the movements of estuarine-associated fish in South Africa was investigated by conducting a tracking experiment on spotted grunter Pomadasys commersonnii in the East Kleinemonde Estuary. The telemetry equipment comprised two VEMCO V8... -
Interpreting behavioural data from Radio-Acoustic Positioning Telemetry (RAPT) systems
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PR Rigby Y Andrade RK O'DorTo detect behavioural patterns of individually tagged squid Loligo vulgaris reynaudii in a Radio-Acoustic Positioning Telemetry (RAPT) buoy array, trajectories reflecting the four dimensions of latitude, longitude, depth and time were plotted from data collected during field experiments in South... -
A hard-knock life: the foraging ecology of Cape cormorants amidst shifting prey resources and industrial fishing pressure
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MH Hamann --- DST/NRF Centre of Excellence at the Percy FitzPatrick Institute of African Ornithology, South Africa D Grémillet --- DST/NRF Centre of Excellence at the Percy FitzPatrick Institute of African Ornithology, South Africa PG Ryan --- DST/NRF Centre of Excellence at the Percy FitzPatrick Institute of African Ornithology, South Africa F Bonadonna --- , France CD van der Lingen --- Department of Agriculture, Forestry and Fisheries, South Africa L Pichegru --- DST/NRF Centre of Excellence at the Percy FitzPatrick Institute of African Ornithology, South AfricaOnce one of the most numerous seabirds of the Benguela upwelling system, the population of Cape cormorants Phalacrocorax capensis has decreased by 60% in the past three decades and the species is listed as Near Threatened. Declines in prey availability... -
Quantifying the degree of protection afforded by a no-take marine reserve on an exploited shark
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C da Silva --- Fisheries Research, Department of Agriculture, South Africa SE Kerwath --- Fisheries Research, Department of Agriculture, South Africa CG Attwood --- Marine Research Institute, Zoology Department, South Africa EB Thorstad --- , Norway PD Cowley --- , South Africa F Økland --- , Norway CG Wilke --- Fisheries Research, Department of Agriculture, South Africa TF Næsje --- , NorwaySharks have been shown to benefit from the protection of marine protected areas (MPAs). There is, however, little information on the degree of protection by MPAs to shark populations. The movements of individual smoothhound sharks Mustelus mustelus in, and adjacent... -
Physical damage, behaviour and post-release mortality of Argyrosomus japonicus after barotrauma and treatment
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PA Butcher --- New South Wales Department of Primary Industries, Australia MK Broadhurst --- New South Wales Department of Primary Industries, Australia BR Cullis --- School of Mathematics and Applied Statistics, Faculty of Informatics, Australia SR Raidal --- School of Animal and Veterinary Sciences, AustraliaTwo experiments were conducted to quantify the mortality of, and clinical signs of barotrauma to, Argyrosomus japonicus after retrieval from 20 m following either ‘no treatment’, ‘venting’ (a needle inserted into the swim bladder) or ‘recompression’ (released with a weighted... -
Movements of, and habitat utilisation by, threespot tilapia Oreochromis andersonii (Teleostei: Cichlidae) in the Upper Zambezi River, Namibia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Finn Økland ClintonJ Hay TorF Næsje Ben Chanda EvaB ThorstadMovements of and habitat utilisation by radio-tagged threespot tilapia (body length 25–50cm) were studied in the Upper Zambezi River between 23 November 2000 and 8 May 2001. Although utilising a relatively large stretch of river (average 5.4km) during the study... -
First tracking of white stumpnose Rhabdosargus globiceps (Sparidae) in a South African marine protected area
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CG Attwood PD Cowley SE Kerwath TF Naesje F Økland EB ThorstadThere is a growing recreational fishery for white stumpnose Rhabdosargus globiceps (Sparidae) in Langebaan Lagoon, part of South Africa's West Coast National Park. The upper reaches of the lagoon are protected from fishing, but the extent to which the closure... -
Area utilisation and activity patterns of roman Chrysoblephus laticeps (Sparidae) in a small marine protected area
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SE Kerwath A Götz CG Attwood WHH Sauer CG WilkeInformation on the movement of fish is vital to determine the effectiveness of marine protected areas (MPAs) for fish conservation and fisheries management. This study investigates area utilisation and activity patterns of 13 adult roman Chrysoblephus laticeps (Sparidae) using telemetry... -
Sea level monitoring in Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PL Woodworth A Aman T AarupA review is provided of the African sea level dataset, which is limited not only in size, especially given the great length of the African coastline, but also in quality. The review is undertaken primarily from Permanent Service for Mean... -
Estuarine habitat use by juvenile dusky kob Argyrosomus japonicus (Sciaenidae), with implications for management
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PD Cowley SE Kerwath A-R Childs EB Thorstad F Økland TF NæsjeThe spatial and temporal area-use patterns of estuarine-dependent juvenile dusky kob Argyrosomus japonicus in the Great Fish Estuary, South Africa, were examined using acoustic telemetry. In all, 29 individuals (307–400 mm total length) were surgically equipped with individually coded transmitters... -
Design and calibration of an acoustic telemetry system subject to upwelling events
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Singh --- Department of Environmental Affairs, South Africa NJ Downey --- , South Africa MJ Roberts --- Department of Environmental Affairs, South Africa DM Webber --- , Canada MJ Smale --- , South Africa MA van den Berg --- Department of Environmental Affairs, South Africa RT Harding --- Department of Environmental Affairs, South Africa DC Engelbrecht --- , South Africa BM Blows --- , South AfricaThe experiments described were designed to calibrate a hexagonal array of VEMCO VR2 receivers and transmitters (model V9P-6L-S256) in isothermal and stratified water columns off the south coast of South Africa. The array, configured with 500 m between receivers, was... -
Movements and habitat utilization of nembwe, Serranochromis robustus (Günther, 1864), in the Upper Zambezi River
Item type: Journal Article • Journal: African Zoology • Authors: Eva B. Thorstad --- Norwegian Institute for Nature Research (NINA), Norway Clinton J. Hay --- Ministry of Fisheries and Marine Resources, Namibia Tor F. Næsje --- Norwegian Institute for Nature Research (NINA), Norway Ben Chanda --- Ministry of Agriculture and Co-operatives, Department of Research and Specialised Services, Zambia Finn Økland --- Norwegian Institute for Nature Research (NINA), NorwayFifteen adult nembwe Serranochromis robustus (Günther, 1864) were tagged with radio transmitters in the Zambezi River, Namibia, from 4–15 November 2000 to record behaviour and outline the implications for fisheries management. The fish were tracked on average every 3.7 days... -
First assessment of estuarine space use and home range of juvenile white steenbras, Lithognathus lithognathus
Item type: Journal Article • Journal: African Zoology • Authors: R. H. Bennett --- Department of Ichthyology and Fisheries Science, South Africa A. R. Childs --- Department of Ichthyology and Fisheries Science, South Africa P. D. Cowley --- South African Institute for Aquatic Biodiversity, South Africa T. F. Næsje --- Norwegian Institute for Nature Research, Norway E. B. Thorstad --- Norwegian Institute for Nature Research, Norway F. Økland --- Norwegian Institute for Nature Research, NorwayThe spatial dynamics and home range sizes of early juvenile white steenbras (Lithognathus lithognathus Cuvier, 1829) in the permanently open Great Fish Estuary, South Africa, were assessed using acoustic telemetry. Seven individuals (154–184 mm fork length) tagged with acoustic transmitters... -
Satellite telemetry of Afrotropical ducks: methodological details and assessment of success rates
Item type: Journal Article • Journal: African Zoology • Authors: Graeme S. Cumming --- Percy FitzPatrick Institute, DST/NRF Center of Excellence, University of Cape Town, Rondebosch, South Africa Mduduzi Ndlovu --- Percy FitzPatrick Institute, DST/NRF Center of Excellence, University of Cape Town, Rondebosch, South AfricaDespite widespread and increasing use of solarpowered satellite transmitters to tag wild birds, there are few published articles that detail how transmitters should be attached to different species and even fewer assessments of the overall field success of telemetry projects... -
Molossid bats in an African agro-ecosystem select sugarcane fields as foraging habitat
Item type: Journal Article • Journal: African Zoology • Authors: Christina Lehmkuhl Noer --- Animal Behavioural Ecology Group, Department of Biology, Denmark Torben Dabelsteen --- Animal Behavioural Ecology Group, Department of Biology, Denmark Kristine Bohmann --- Section for Evolutionary Genomics, Centre for GeoGenetics, Natural History Museum of Denmark, Denmark Ara Monadjem --- All Out Africa Research Unit, Department of Biological Sciences, SwazilandTwo coexisting species of African molossids, the little free-tailed bat, Chaerephon pumilus, and the Angolan free-tailed bat, Mops condylurus, were studied in the lowveld of Swaziland. Nine C. pumilus and five M. condylurus, all non-lactating females, were radio-tracked in order... -
A study of moult-site fidelity in Egyptian geese, Alopochen aegyptiaca, in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Mduduzi Ndlovu --- Organisation for Tropical Studies/School of Animal, Plant and Environmental Sciences, University of Witwatersrand, South Africa Graeme S. Cumming --- Percy FitzPatrick Institute, DST/NRF Centre of Excellence, University of Cape Town, South Africa Philip A. R. Hockey --- Percy FitzPatrick Institute, DST/NRF Centre of Excellence, University of Cape Town, South Africa Mbongeni D. Nkosi --- Percy FitzPatrick Institute, DST/NRF Centre of Excellence, University of Cape Town, South Africa Gregory L. Mutumi --- Percy FitzPatrick Institute, DST/NRF Centre of Excellence, University of Cape Town, South AfricaLittle is known about moult and moult-site fidelity of African waterfowl. Satellite telemetry and uniquely engraved colour-rings were used to study moult-site fidelity of Egyptian geese marked at two sites in South Africa – Barberspan in the summer-rainfall region and... -
Movement ecology of five Afrotropical waterfowl species from Malawi, Mali and Nigeria
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: John Y Takekawa --- US Geological Survey, USA Shane R Heath --- US Geological Survey, USA Samuel A Iverson --- US Geological Survey, USA Nicolas Gaidet --- CIRAD, UPR AGIRs, Campus international de Baillarguet, France Julien Cappelle --- CIRAD, UPR AGIRs, Campus international de Baillarguet, France Tim Dodman --- Hundland, UK Ward Hagemeijer --- Wetlands International, The Netherlands William D Eldridge --- US Fish and Wildlife Service, USA Scott A Petrie --- Long Point Waterfowl, Canada Gregory S Yarris --- US Geological Survey, USA Shiiwua Manu --- AP Levantis Ornithological Research Institute, Nigeria Glenn H Olsen --- US Geological Survey, USA Diann J Prosser --- US Geological Survey, USA Kyle A Spragens --- US Geological Survey, USA David C Douglas --- US Geological Survey, USA Scott H Newman --- Food and Agriculture Organization of the United Nations, VietnamHabitat availability for Afrotropical waterbirds is highly dynamic with unpredictable rainfall patterns and ephemeral wetlands resulting in diverse movement strategies among different species. Movement strategies among waterfowl encompass resident, regional and intercontinental migrants, but little quantitative information exists on their... -
Seasonality, behaviour and philopatry of spotted ragged‑tooth sharks Carcharias taurus in Eastern Cape nursery areas, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MJ Smale --- Port Elizabeth Museum at Bayworld, South Africa ML Dicken --- Port Elizabeth Museum at Bayworld, South Africa AJ Booth --- Department of Ichthyology and Fisheries Science, South AfricaSpotted ragged‑tooth sharks Carcharias taurus occur along the southern and eastern coasts of South Africa. We report on movements of juveniles and adults within a known nursery area on the Eastern Cape coast using acoustic telemetry. The focus area of... -
Seasonal variability of bull and tiger shark presence on the west coast of Reunion Island, western Indian Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Blaison --- IRD La Réunion, UMR MARBEC (IRD/IFREMER/UM/CNRS), France S Jaquemet --- Université de La Réunion, France D Guyomard --- Comité Régional des Pêches Maritimes et des Elevages Marins de La Réunion (CRPMEM), France G Vangrevelynghe --- Squal'Idées, Stella, France T Gazzo --- WEST, Saint Gilles, France G Cliff --- KwaZulu-Natal Sharks Board, South Africa P Cotel --- IRD La Réunion, UMR MARBEC (IRD/IFREMER/UM/CNRS), France M Soria --- IRD La Réunion, UMR MARBEC (IRD/IFREMER/UM/CNRS), FranceA fisheries‑independent survey using longlines and drumlines, and an acoustic telemetry study, revealed that bull sharks Carcharhinus leucas and tiger sharks Galeocerdo cuvier occur throughout the year off the west coast of Reunion Island. The research, which commenced in 2011,... -
Movement behaviour of largemouth bass Micropterus salmoides in a South African impoundment
Item type: Journal Article • Journal: African Zoology • Authors: Dylan H Howell --- Department of Ichthyology and Fisheries Science, South Africa Paul D Cowley --- Department of Ichthyology and Fisheries Science, South Africa Amber-Robyn Childs --- Department of Ichthyology and Fisheries Science, South Africa Olaf LF Weyl --- Department of Ichthyology and Fisheries Science, South AfricaThe objectives of this study were to describe movements and area use patterns of largemouth bass Micropterus salmoides in relation to abiotic factors (water temperature, river inflow and water level). The study was conducted in the Kubusi arm of Wriggleswade... -
Does home range of the black-tailed tree rat (Thallomys nigricauda Thomas 1882) change with season along an aridity gradient?
Item type: Journal Article • Journal: African Zoology • Authors: Joy C. Coleman --- School of Biological and Conservation Sciences, South Africa Colleen T. Downs --- School of Biological and Conservation Sciences, South AfricaHome-range size may reflect the physiological state and energetic requirements of an individual. In the black-tailed tree rat (Thallomys nigricauda) we expected differences in the home-range size of populations in habitats of differing productivity, as measured along an aridity gradient,... -
Movement behaviour of alien largemouth bass Micropterus salmoides in the estuarine headwater region of the Kowie River, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Taryn S Murray --- South African Institute for Aquatic Biodiversity, South Africa Mandla L Magoro --- South African Institute for Aquatic Biodiversity, South Africa Alan K Whitfield --- South African Institute for Aquatic Biodiversity, South Africa Paul D Cowley --- South African Institute for Aquatic Biodiversity, South AfricaThe movement behaviour of largemouth bass Micropterus salmoides in the estuarine headwater region of the Kowie River, South Africa, was investigated using passive acoustic telemetry. Ten adult fish were tagged and released in four discrete pools below a weir that... -
Migration patterns of the Osprey Pandion haliaetus on the Eastern European–East African flyway
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Ülo Väli --- Department of Zoology, Estonia Urmas Sellis --- Eagle Club, EstoniaWe analysed migration strategies of the Osprey Pandion haliaetus on the poorly studied Eastern European–East African flyway. Four adult birds were equipped with GPS-based satellite-transmitters or data-loggers in their breeding sites in Estonia (north-eastern Europe) and tracked to their wintering... -
Diel movement of smallmouth yellowfish Labeobarbus aeneus in the Vaal River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: FJ Jacobs --- Kamutjonga Inland Fisheries Institute, Namibia GC O'Brien --- Aquatic Ecosystem Research Group, School of Life Sciences, South Africa NJ Smit --- Water Research Group (Ecology), Unit for Environmental Sciences and Management, South AfricaDiel movements of Orange–Vaal smallmouth yellowfish Labeobarbus aeneus (Burchell, 1822) in the Vaal River, South Africa, were determined by externally attaching radio transmitters to 11 adult fish and manually tracking them between March and May 2012. Twenty-four radio telemetry monitoring... -
Influence of prey abundance and abiotic factors on the long-term home-range and movement dynamics of spotted grunter Pomadasys commersonnii in an intermittently open estuary
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BA Maree --- Department of Ichthyology and Fisheries Science, South Africa PD Cowley --- Department of Ichthyology and Fisheries Science, South Africa TF Næsje --- South African Institute for Aquatic Biodiversity, South Africa A-R Childs --- Department of Ichthyology and Fisheries Science, South Africa AI Terörde --- Arcus Consulting, South Africa EB Thorstad --- Norwegian Institute for Nature Research, NorwayLong-term home-range and movement dynamics of spotted grunter Pomadasys commersonnii and the distribution of their dominant prey, the sandprawn Callichirus kraussi, were investigated in the intermittently open East Kleinemonde Estuary, South Africa. In addition, the effects of fish length, diel... -
Estuarine and coastal connectivity of an estuarine-dependent fishery species, Pomadasys commersonnii (Haemulidae)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MH Dames --- Department of Ichthyology and Fisheries Science, South Africa PD Cowley --- South African Institute for Aquatic Biodiversity, South Africa A-R Childs --- Department of Ichthyology and Fisheries Science, South Africa RH Bennett --- South African Institute for Aquatic Biodiversity, South Africa EB Thorstad --- Norwegian Institute for Nature Research, Norway TF Næsje --- Norwegian Institute for Nature Research, NorwayUnderstanding the level of connectivity between estuarine and coastal waters is essential for appropriate management of estuarine-associated taxa. Most studies have focused on the role of a single estuary, while limited research exists on the importance of multiple estuaries to... -
Space use by Rhabdosargus holubi in a southern African estuary, with emphasis on fish movements and ecosystem connectivity
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GN Grant --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa RH Bennett --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa TS Murray --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa AK Whitfield --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaTwenty-one juvenile Cape stumpnose Rhabdosargus holubi (140–190 mm fork length) were tagged with internal acoustic transmitters in the lower, middle and upper reaches of the Kowie Estuary, South Africa. The movements of each fish were continually monitored from October 2014... -
Home range and habitat use of Trumpeter Hornbills Bycanistes bucinator in an urban–forest mosaic, Eshowe, South Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Moses Chibesa --- School of Life Sciences, South Africa Barry Taylor --- School of Life Sciences, South Africa Tharmalingam Ramesh --- School of Life Sciences, South Africa Colleen T Downs --- School of Life Sciences, South AfricaDespite the negative impacts of urbanisation, some species adapt to pressures of habitat loss and fragmentation. Trumpeter Hornbills Bycanistes bucinator are a large avian forest frugivore that uses urban environments in South Africa. Consequently, we used GPS/UHF transmitters to study... -
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... -
The spatial ecology of adult Labeobarbus marequensis and their response to flow and habitat variability in the Crocodile River, Kruger National Park
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MJ Burnett --- Centre for Aquatic Research, Zoology Department, South Africa GC O’Brien --- School of Biology and Environmental Sciences, South Africa V Wepener --- Water Research Group, Unit for Environmental Sciences and Management, South Africa D Pienaar --- Scientific Services Skukuza, Kruger National Park, South AfricaThe spatial movement of Labeobarbus marequensis was evaluated by attaching radio transmitters to 16 adult fish and tracking them from August 2009 to July 2012 in the Crocodile River, Kruger National Park, South Africa. Monthly monitoring surveys acquired 1 620... -
Using mark-recapture methods to estimate population size and survival of pyjama sharks Poroderma africanum in Mossel Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SP Grusd --- Department of Biological Sciences and the Marine Research Institute, South Africa CL Moloney --- Department of Biological Sciences and the Marine Research Institute, South Africa G Distiller --- Statistics in Ecology, Environment and Conservation (SEEC), Department of Statistical Sciences, South Africa RGA Watson --- Oceans Research, South Africa PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa E Gennari --- Oceans Research, South AfricaThe pyjama shark Poroderma africanum (family Scyliorhinidae) is endemic to coastal waters of South Africa but its population characteristics are poorly known. This study aims to estimate baseline demographic parameters for P. africanum in Mossel Bay. We applied mark-recapture methods... -
Large-scale movements and site fidelity of two bull sharks Carcharhinus leucas estimated from a double-tagging experiment at Réunion Island (southwest Indian Ocean)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Soria --- , France Y Tremblay --- , France A Blaison --- , France F Forget --- , France E Crochelet --- , Réunion L Dagorn --- , FranceSince 2011, the mean number of bites per year by bull sharks Carcharhinus leucas has increased markedly at Réunion Island. To predict areas and periods of increased risk, we need to better understand the space-use dynamics of individual sharks. In... -
Movement behaviour of catface rockcod Mycteroperca (Epinephelus) andersoni (Epinephelidae) off the eastern seaboard of southern Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BQ Mann --- , South Africa R Daly --- , South Africa GL Jordaan --- , South Africa WN Dalton --- , South Africa ST Fennessy --- , South AfricaMovement behaviour of the endemic epinephelid Mycteroperca andersoni (formerly allocated to genus Epinephelus) along the east coast of southern Africa was investigated using both conventional dart tagging and passive acoustic telemetry. Results from both methods showed that this species is... -
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... -
Activity area, movement patterns, and habitat use of the desert monitor, varanus griseus, in the zaranik protected area, north Sinai, Egypt
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: AdelA. Ibrahim --- Faculty of Education at Al‐Arish, EgyptA radio telemetry study of the desert monitor, Varanus griseus was conducted from July 1997 to June 1998 in the Zaranik Protected Area, North Sinai, Egypt. Five monitor lizards (SVL range 302 ‐ 360 mm) were equipped with SI‐2T temperature... -
Spatial use of non-breeding sites by adult GPS-tracked Ospreys Pandion haliaetus from Germany
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Bernd-Ulrich Meyburg --- , Germany Daniel Holte --- , GermanyRecent analyses of telemetry data on Ospreys Pandion haliaetus predominantly address migratory movements, whereas studies focusing on spatial use are rare, especially concerning the African non-breeding areas. We analysed GPS telemetry data of 15 adult Ospreys breeding in northeast Germany,... -
Unravelling the mystery of a unique giant trevally Caranx ignobilis aggregation in the Mtentu Estuary, Pondoland Marine Protected Area, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RB Dixon --- Rhodes University, South Africa BQ Mann --- Rhodes University, South Africa TS Murray --- Rhodes University, South Africa PD Cowley --- Rhodes University, South Africa R Daly --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaThe giant trevally Caranx ignobilis (family Carangidae) is an iconic apex predatory fish valued by recreational and commercial fisheries globally. A seasonal but episodic aggregation of up to ∼1 000 individuals takes place in the Mtentu Estuary in the Eastern...