Search
Search results for
We found
28 results for you
-
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 microsatellite panel for triploid verification in the abalone Haliotis midae
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Slabbert --- Aquaculture Division, Department of Genetics, South Africa N Prins --- Aquaculture Division, Department of Genetics, South Africa D Brink --- Aquaculture Division, Department of Genetics, South AfricaA method for ploidy verification of triploid and diploid Haliotis midae was developed using molecular microsatellite markers. In all, 30 microsatellite loci were tested in control populations. A final micro satellite multiplex consisting of seven markers were optimised and a... -
Observations of individual humpback whales utilising multiple migratory destinations in the south-western Indian Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PJ Ersts --- Center for Biodiversity and Conservation, USA C Pomilla --- Sackler Institute for Comparative Genomics, USA J Kiszka --- Observatoire des Mammifères Marins, France S Cerchio --- Sackler Institute for Comparative Genomics, USA HC Rosenbaum --- Center for Biodiversity and Conservation, USA M Vély --- , France Y Razafindrakoto --- Madagascar Country Program, Madagascar JA Loo --- Sackler Institute for Comparative Genomics, USA MS Leslie --- Sackler Institute for Comparative Genomics, USA M Avolio --- Barnard College, USAMovements of humpback whales Megaptera novaeangliae among breeding regions within the southwestern Indian Ocean are poorly understood. Understanding the relationships among breeding regions is critical for effective conservation and management strategies. Through systematic comparisons of molecular genotypes and both systematic... -
Preliminary evidence suggests extra-pair mating in the endangered echo parakeet, Psittacula eques
Item type: Journal Article • Journal: African Zoology • Authors: Tiawanna D. Taylor --- Institute of Genetics, University of Nottingham, Queens Medical Centre, U.K. David T. Parkin --- Institute of Genetics, University of Nottingham, Queens Medical Centre, U.K.Parrots are generally considered monogamous, forming strict pairs when breeding. Echo parakeets are unusual in that, although traditional breeding pairs occur, there are also multi-male breeding groups. This raises questions about the potential for extra-pair copulations. Genotype data were obtained... -
Spatial genetic pattern in an economically beneficial insect, the cyclical African wild silk moth (Gonometa postica)
Item type: Journal Article • Journal: African Zoology • Authors: Timothy C. Bray --- Department of Zoology and Entomology, South AfricaThe African wild silk moth (Gonometa postica) exhibits large inter-annual population size fluctuations in the Kalahari region of southern Africa. Spent cocoons from this species are currently being utilized in a local silk industry. An understanding of the recolonization dynamics... -
Genetic variation in a North African rodent pest, Meriones shawi: microsatellite polymorphism
Item type: Journal Article • Journal: African Zoology • Authors: Aude Lalis --- Département Systématique et Evolution, France Josie Lambourdière --- Service de Systématique Moléculaire, Muséum National d’Histoire Naturelle, FranceMeriones shawi is an ubiquitous and endemic rodent in northern African. This species is considered as an economically important pest because it often damages crops. Moreover, the gerbillines are known to function as reservoirs for a variety of serious human... -
Microsatellite DNA analyses reveal population subdivisions among the recently introduced Nile perch (Lates spp.) in Lake Victoria
Item type: Journal Article • Journal: African Zoology • Authors: Matthew T. Mwanja --- ARDC–Kajjansi, Uganda Vincent B. Muwanika --- Department of Environmental Management, South Africa Charles Masembe --- Biology Department, Uganda Wilson W. Mwanja --- Department of Fisheries Resources, Uganda Silvester Nyakaana --- Biology Department, UgandaNile perch (Lates spp.) was introduced into Lake Victoria only five decades ago but is now well established and distributed throughout the lake. Given the extensive size of the lake, there is a possibility of isolation by distance that can... -
Microsatellite markers for population genetic studies of the rock firefinch, Lagonosticta sanguinodorsalis
Item type: Journal Article • Journal: African Zoology • Authors: Jacinta Abalaka --- Department of Genetics, South Africa Bengt Hansson --- Department of Biology, SwedenWe identified the first set of microsatellites for use in the rock firefinch (Lagonosticta sanguinodorsalis). First, we tested existing passerine microsatellite loci for cross-species amplification success in a small sample of rock firefinches and identified 10 loci that were seemingly... -
Paternity in the Addo elephant population, South Africa. Is a single male monopolizing matings?
Item type: Journal Article • Journal: African Zoology • Authors: Anna M. Whitehouse --- Terrestrial Ecology Research Unit, Department of Zoology, South Africa Eric H. Harley --- Department of Chemical Pathology, South AfricaThe hypothesis that a single dominant male (GAA) monopolized all matings within the elephant population of South Africa’s Addo Elephant National Park between 1982 and 1996 was tested using microsatellite analysis. In addition, behavioural data on male musth periods, female... -
Preliminary insights into the level of genetic variation retained in the endangered echo parakeet (Psittacula eques) towards assisting its conservation management
Item type: Journal Article • Journal: African Zoology • Authors: Tiawanna D. Taylor --- Institute of Genetics, University of Nottingham, U.K. David Y. Parkin --- Institute of Genetics, University of Nottingham, U.K.This study examined a suite of microsatellite markers, originally developed for other parrot species, for their usefulness in providing details about the amount of genetic variation that has been retained in the endangered echo parakeet of Mauritius. Biological samples were... -
Genetic monitoring of ex situ African Penguin (Spheniscus demersus) populations in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Christiaan Labuschagne --- Department of Genetics, South Africa Lisa Nupen --- National Zoological Gardens of South Africa, South Africa Antoinette Kotzé --- Department of Genetics, South Africa J Paul Grobler --- Department of Genetics, South Africa Desiré L Dalton --- Department of Genetics, South AfricaThe African Penguin (Spheniscus demersus) has suffered population declines and is listed in the IUCN Red List as Endangered. The species is endemic to the coast of southern Africa, and breeding colonies are distributed on the south-western coast of Africa... -
Genetic diversity within two Tunisian wild jirds: Meriones shawi and Meriones libycus (Rodentia, Gerbillinae)
Item type: Journal Article • Journal: African Zoology • Authors: Hanene Khemiri --- Laboratory of Animal Ecology, Department of Biology, Sciences Faculty of Tunis, Tunisia João Pimenta --- Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal António Amorim --- Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal Pascale Chevret --- Laboratoire de Biométrie et Biologie Evolutive – UMR CNRS 5558, France Saïd Nouira --- Laboratory of Animal Ecology, Department of Biology, Sciences Faculty of Tunis, Tunisia Alexandra M Lopes --- Instituto de Investigação e Inovação em Saúde, Universidade do Porto, PortugalThree Meriones species inhabit Tunisia, namely M. shawi, M. libycus and M. crassus, but little genetic data exist on these gerbils. We collected Meriones from eight localities in Tunisia, and obtained mitochondrial (cytochrome b) and nuclear (IRBP) gene sequence data... -
Development of a low-resolution genome scan marker set for the acceleration of major gene or QTL mapping in wheat
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Elsabet Wessels --- CenGen (Pty) Ltd, South Africa Renée Prins --- CenGen (Pty) Ltd, South AfricaThe traditional approach to identify targeted quantitative trait loci (QTL) or genes in a mapping study is to develop partial to comprehensive genetic maps by using a fairly large number of molecular markers. This is a cumbersome and potentially expensive... -
Genetic stock structure of white steenbras Lithognathus lithognathus (Cuvier, 1829), an overexploited fishery species in South African waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RH Bennett --- South African Institute for Aquatic Biodiversity, South Africa K Reid --- Molecular Ecology and Evolution Programme, Department of Genetics, South Africa G Gouws --- South African Institute for Aquatic Biodiversity, South Africa P Bloomer --- Molecular Ecology and Evolution Programme, Department of Genetics, South Africa PD Cowley --- South African Institute for Aquatic Biodiversity, South AfricaWhite steenbras Lithognathus lithognathus (Teleostei: Sparidae) is an overexploited marine fish species endemic to South Africa. Overexploitation in recreational, subsistence and commercial fisheries has resulted in stock collapse and the need for improved management of the species. Adults are thought... -
Genetic structure of wild and domesticated grasscutters (Thryonomys swinderianus) from south-western Nigeria
Item type: Journal Article • Journal: African Zoology • Authors: Oluwakayode M Coker --- Department of Wildlife and Ecotourism Management, Nigeria Abosede O Omonona --- Department of Wildlife and Ecotourism Management, Nigeria Olusegun A Fagbohun --- Department of Veterinary Microbiology and Parasitology, Nigeria Cortney Pylant --- Department of Wildlife Ecology and Conservation, USA James D Austin --- Department of Wildlife Ecology and Conservation, USAGrasscutter (Thryonomys swinderianus) is a large rodent distributed across sub-Saharan Africa that is highly valued as a source of protein. There has been little effort to evaluate the genetic structure of grasscutters despite long-term harvesting pressure and over 40 years... -
Genetic diversity and population connectivity of the sea urchin Tripneustes gratilla along the South African coast
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Brink --- Molecular Breeding and Biodiversity Group, Department of Genetics, South Africa R Dale Kuys --- Molecular Breeding and Biodiversity Group, Department of Genetics, South Africa C Rhode --- Molecular Breeding and Biodiversity Group, Department of Genetics, South Africa BM Macey --- Branch: Fisheries Management, Department of Agriculture, South Africa KW Christison --- Branch: Fisheries Management, Department of Agriculture, South Africa R Roodt-Wilding --- Molecular Breeding and Biodiversity Group, Department of Genetics, South AfricaThe collector sea urchin Tripneustes gratilla has been identified as a species with potential for aquaculture production in South Africa. The species’ roe is considered a culinary delicacy in Asia and Europe. However, T. gratilla remains genetically uncharacterised in South... -
High genetic diversity of Fusarium circinatum associated with the first outbreak of pitch canker on Pinus patula in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Felix F Fru --- Department of Plant and Soil Sciences, Forestry and Agricultural Biotechnology Institute (FABI), South Africa Emma T Steenkamp --- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), South Africa Michael J Wingfield --- Department of Plant and Soil Sciences, Forestry and Agricultural Biotechnology Institute (FABI), South Africa Jolanda Roux --- Department of Plant and Soil Sciences, Forestry and Agricultural Biotechnology Institute (FABI), South AfricaThe disease known as pitch canker results from infection of Pinus species by the fungus Fusarium circinatum. This fungus also causes a serious root disease of Pinus seedlings and cuttings in forestry nurseries. Pinus radiata and P. patula are especially... -
Genomic resources for the spotted ragged-tooth shark Carcharias taurus
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JD Klein --- Centre for Ecological Genomics and Wildlife Conservation, Department of Zoology, South Africa AE Bester-van der Merwe --- Molecular Breeding and Biodiversity Group, Department of Genetics, South Africa ML Dicken --- KwaZulu-Natal Sharks Board, South Africa A Emami-Khoyi --- Centre for Ecological Genomics and Wildlife Conservation, Department of Zoology, South Africa KL Mmonwa --- KwaZulu-Natal Sharks Board, South Africa PR Teske --- Centre for Ecological Genomics and Wildlife Conservation, Department of Zoology, South AfricaGenomic data can be a useful tool in the management and conservation of biodiversity. Here, we report the development of genomic resources for the spotted ragged-tooth shark Carcharias taurus using genome-wide DNA data from Illumina next-generation sequencing. We explored two... -
Assessing multiple mating and reproductive skew in three species of clinid fishes (Blenniiformes: Clinidae: Clinini), in reference to multiple mating in viviparous teleosts
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MJ Scheepers --- Department of Ichthyology and Fisheries Science, South Africa G Gouws --- National Research Foundation–South African Institute for Aquatic Biodiversity (NRF–SAIAB), South AfricaThis study investigated multiple mating in three species of intertidal klipfishes (family Clinidae): super klipfish Clinus superciliosus, bluntnose klipfish Clinus cottoides, and nosestripe klipfish Muraenoclinus dorsalis. These species display the rare reproductive mode of female vivipary with superfetation, a phenomenon... -
Genetic structure associated with habitat diversification supports the independent evolution of ecomorphs in Bradypodion pumilum
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Krystal A Tolley --- , South Africa Kevin P Hopkins --- , South Africa Jessica M da Silva --- , South AfricaThere are notable examples of repeated evolution of ecomorphs within groups of closely related species, these are typically viewed as remarkable cases of natural selection. In most cases, directional selection for certain phenotypic traits under specific (and differing) environmental conditions... -
Evidence for multiple paternity and confirmation of an Indo-Pacific origin of blacktip shark Carcharhinus limbatus occurring in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AE Bester-van der Merwe --- Molecular Breeding and Biodiversity Group, Department of Genetics, South Africa SN Maduna --- Molecular Breeding and Biodiversity Group, Department of Genetics, South Africa KL Hull --- Molecular Breeding and Biodiversity Group, Department of Genetics, South Africa J Bell --- Molecular Breeding and Biodiversity Group, Department of Genetics, South Africa C Rossouw --- Molecular Breeding and Biodiversity Group, Department of Genetics, South Africa SP Wintner --- KwaZulu-Natal Sharks Board, South AfricaThe blacktip shark Carcharhinus limbatus is a cosmopolitan species found in warm-temperate, subtropical and tropical waters around the world. The research here aimed to assess whether multiple paternity exists in South African C. limbatus and to confirm phylogeographic patterns previously... -
Minimal evidence of interspecific hybridisation between the Yellow-billed Duck and introduced Mallard in central and northwestern South Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Stacey G de Souza --- School of Molecular and Cell Biology, South Africa Craig T Symes --- School of Animal, Plant and Environmental Sciences, South Africa Hanneline Smit-Robinson --- School of Animal, Plant and Environmental Sciences, South Africa Jean M Mollett --- School of Molecular and Cell Biology, South AfricaHybridisation is the interbreeding of genetically distinct groups that can lead to introgression – an exchange of genetic material between species. Hybridisation is of conservation concern when an alien invasive species is involved, as it can lead to a loss... -
Development of genetic tools for the redbait species Pyura herdmani and P. stolonifera, important bioengineers along African coastlines
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Dinoi --- , South Africa M Rius --- , South Africa M Tine --- , South Africa PR Teske --- , South AfricaThe development of new genetic resources is key for biological conservation in an era when the preservation of biodiversity is crucial. Here, we report the development of microsatellites and mitochondrial markers for the redbait species Pyura herdmani and P. stolonifera,... -
Genetic variation between and within two populations of bat-eared foxes (Otocyon megalotis Desmarest, 1822) in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Maria Granell-Ruiz --- , Sweden Karin Norén --- , Sweden Daniela C Kalthoff --- , Sweden Aliza le Roux --- , South Africa Fredrik Dalerum --- , SwedenInformation on genetic variation within and among populations is relevant for a broad range of topics in biology. We use a combination of mitochondrial and nuclear microsatellite markers to evaluate genetic variation within and between two populations of bat-eared foxes... -
Small, specialised and highly mobile? The tree-hole breeding frog, Phrynobatrachus guineensis, lacks fine-scale population structure
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Laura Sandberger --- Leibniz Institute for Research on Evolution and Biodiversity at the Humboldt University Berlin, Germany Heike Feldhaar --- University of Osnabrück, Germany KathrinP. Lampert --- University of Bochum, Germany DunjaK. Lamatsch --- Austrian Academy of Sciences and Institute for Limnology, Austria Mark-Oliver Rödel --- Leibniz Institute for Research on Evolution and Biodiversity at the Humboldt University Berlin, GermanyData on population dynamics and distribution are of primary interest to biologists because they reveal information about the species' ecology and evolution and are thus essential for conservation efforts. Patchily distributed species are especially interesting for conservation studies, because of... -
Multiple paternity and sperm storage in the Cape Dwarf Chameleon (Bradypodion pumilum)
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Krystal A. Tolley --- , , South Africa Lucas F. Chauke --- , , South Africa Jennifer C. Jackson --- , , South Africa Kevin A. Feldheim --- , , USAAlthough multiple paternity and sperm storage are common in squamates, neither has been conclusively demonstrated in the chameleons (Chamaeleonidae). To examine whether these traits are present in chameleons, the Cape Dwarf Chameleon (Bradypodion pumilum) was investigated. This viviparous species inhabits... -
Genetic consequences in the southern African endemic seabream Polysteganus undulosus (Sparidae) after eight decades of overfishing
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CJ Oosthuizen --- University of Pretoria, South Africa BQ Mann --- Oceanographic Research Institute (ORI), South Africa P Bloomer --- University of Pretoria, South Africa TB Hoareau --- University of Pretoria, South AfricaThe Critically Endangered seventy-four seabream Polysteganus undulosus, a slow-growing sparid that forms spawning aggregations off South Africa, faced heavy exploitation from 1910 until a fishery moratorium was put in place in 1998. Utilising temporal samples from 1962/1963 (mid-collapse) and 2005/2006... -
Influence of the Benguela Upwelling System on the genetic connectivity of blacktail seabream Diplodus capensis across southern Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WF Olivier --- Genetics and Microbiology, University of Pretoria, South Africa WM Potts --- Rhodes University, South Africa A-R Childs --- Rhodes University, South Africa C Santos --- Agostinho Neto University, Angola PW Shaw --- Aberystwyth University, R Henriques --- Genetics and Microbiology, University of Pretoria, South AfricaOceanographic features such as upwelling cells and currents contribute to shaping the evolutionary history of marine fishes, including species that may be important socio-economic resources. However, the impacts of these barriers are often cryptic and may change, particularly in a...