Search
Search results for
We found
34 results for you
-
Hypersensitivity of rust resistance in lentil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: TG Negussie --- Ethiopian Institute of Agricultural Research, Ethiopia CM Bender --- Department of Plant Sciences, South Africa PWJ van Wyk --- Centre for Microscopy, South Africa ZA Pretorius --- Department of Plant Sciences, South AfricaCharacterising resistance at different levels of expression is important in understanding host defence mechanisms and the improvement of durable disease resistance in crop plants. Histological reactions of the lentil cultivars EL-142 (susceptible) and Gudo (resistant) to infection by Uromyces viciae-fabae,... -
Reproduction and recruitment patterns of the surf clam Donax serra (Bivalvia, Donacidae) on two Namibian sandy beaches
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: J. Laudien T. Brey W. E. ArntzReproduction and recruitment of the surf clam Donax serra on two Namibian beaches were studied over a period of two years. Histological examination of the gonads indicated a discontinous annual reproductive cycle, related to monthly mean sea surface temperature. The... -
Histopathological changes in two potential indicator fish species from a hyper-eutrophic freshwater ecosystem in South Africa: a baseline study
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MJ Marchand --- Department of Zoology, South Africa JC van Dyk --- Department of Zoology, South Africa IEJ Barnhoorn --- Andrology, Department of Urology, South Africa GM Wagenaar --- Department of Zoology, South AfricaHistopathological changes were identified in selected target organs from two freshwater fish species, Clarias gariepinus and Oreochromis mossambicus, inhabiting the hyper-eutrophic Roodeplaat Dam near Pretoria. A histology-based fish health assessment protocol was used, including a semiquantitative histopathological assessment of the... -
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... -
Metal contamination of sediments and fish from the Vaal River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: W Pheiffer --- Unit for Environmental Sciences and Management, R Pieters --- Unit for Environmental Sciences and Management, JC van Dyk --- Department of Zoology, NJ Smit --- Unit for Environmental Sciences and Management,Mining and other economic activities have led to the pollution of the Vaal River with metals of mainly industrial origin, but the consequences of this for animal and human health are unknown. Based on chemical analysis and histological examination, we... -
Gonadal cycle of the dwarf oyster Ostreola stentina from the south of the Gulf of Hammamet on the eastern coast of Tunisia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: I Ben Salah --- Laboratoire de Biodiversité et Ecosystèmes Aquatiques, Tunisie A Bouain --- Laboratoire de Biodiversité et Ecosystèmes Aquatiques, Tunisie L Neifar --- Laboratoire de Biodiversité et Ecosystèmes Aquatiques, TunisieThe reproductive cycle of the dwarf oyster Ostreola stentina (Payraudeau 1826) at Monastir in the south of the Gulf of Hammamet on the east coast of Tunisia was studied using condition indices and histological techniques. The species was shown to... -
Reproductive and feeding biology of the endangered fiery redfin, Pseudobarbus phlegethon (Barnard 1938) (Teleostei: Cyprinidae), in the Noordhoeks River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Whitehead OLF Weyl IR BillsThe aim of this study was to contribute to the knowledge on the reproductive and feeding biology of the endangered Pseudobarbus phlegethon (Barnard 1938) in the Olifants River system, by providing estimates of its maturity, reproductive periodicity and the diet... -
Histological changes in the gills of Clarias gariepinus (Teleostei: Clariidae) from a polluted South African urban aquatic system
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JC van Dyk --- Centre for Aquatic Research, Department of Zoology, South Africa MJ Marchand --- Centre for Aquatic Research, Department of Zoology, South Africa GM Pieterse --- Centre for Aquatic Research, Department of Zoology, South Africa IEJ Barnhoorn --- Department of Urology, South Africa MS Bornman --- Department of Urology, South AfricaA semi-quantitative histological assessment was used to investigate histological changes in the gills of Clarias gariepinus from Marais Dam and Rietvlei Dam near Pretoria, which receive effluent from sewage treatment plants and industries, as well as runoff from informal settlements... -
A histology-based fish health assessment of four commercially and ecologically important species from the Okavango Delta panhandle, Botswana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JC van Dyk --- Centre for Aquatic Research, Department of Zoology, South Africa MJ Marchand --- Centre for Aquatic Research, Department of Zoology, South Africa NJ Smit --- Centre for Aquatic Research, Department of Zoology, South Africa GM Pieterse --- Centre for Aquatic Research, Department of Zoology, South AfricaThe health status of four commercially and ecologically important fish species from the Okavango Delta was assessed, using a histology-based health assessment protocol, to establish baseline data for future toxicity studies. Following the calculation of a necropsy-based health assessment index... -
Aseasonal reproduction in the Hottentot golden mole, Amblysomus hottentotus (Afrosoricida: Chrysochloridae) from KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: S. Schoeman --- Department of Zoology and Entomology, South Africa N. C. Bennett --- Mammal Research Institute, Department of Zoology and Entomology, South Africa M. van der Merwe --- Mammal Research Institute, Department of Zoology and Entomology, South Africa A. S. Schoeman --- Department of Zoology and Entomology, South AfricaThe Hottentot golden mole, Amblysomus hottentotus, is a subterranean mammal that exhibits aseasonal breeding. Reproductive organs of golden moles that had been killed on a monthly basis over a period of one year were examined. Reproductive tract measurements and body... -
Bone growth patterns in two cordylid lizards, Cordylus cataphractus and Pseudocordylus capensis
Item type: Journal Article • Journal: African Zoology • Authors: Amanda J. Curtin --- Department of Zoology, South Africa P. le --- Department of Zoology, South Africa Fras N. Mouton --- Department of Zoology, South Africa Anusuya Chinsamy --- Department of Zoology, South AfricaCross-sections through the midshaft of the femora from an ontogenetic range of individuals were examined for Cordylus cataphractus, a heavily armoured, group-living lizard found in the western parts of South Africa, and Pseudocordylus capensis, an agile, montane lizard, occurring in... -
Aspects of the anatomy and histology of the alimentary canal of the greater cane rat, Thryonomys swinderianus, with reference to its feeding physiology
Item type: Journal Article • Journal: African Zoology • Authors: A. van Zyl --- Department of Zoology and Entomology, South Africa R.V. Rambau --- Department of Zoology and Entomology, South Africa M. van der Merwe --- Department of Zoology and Entomology, South AfricaAspects of the anatomy and histology of the alimentary canal of Thryonomys swinderianus were studied to gain a better understanding of this animal’s ability to digest large quantities of fibre. Morphometric measurements of the gut regions were taken with the... -
Histological confirmation of epizootic ulcerative syndrome in two cyprinid species from Lake Liambezi, Zambezi Region, Namibia
Item type: Journal Article • Journal: African Zoology • Authors: Kyle J. McHugh --- Department of Agriculture Forestry and Fisheries, South Africa Kevin W. Christison --- Department of Agriculture Forestry and Fisheries, South Africa Olaf L.F. Weyl --- South African Institute for Aquatic Biodiversity,, South Africa Nico J. Smit --- Water Research Group (Ecology), Unit for Environmental Sciences and Management, Potchefstroom Campus, North-West University, South AfricaEpizootic ulcerative syndrome (EUS) is a fish disease caused by an infection of the oomycete, Aphanomyces invadans. During a fish biodiversity assessment of Lake Liambezi, Zambezi Region, Namibia, in August 2011, two Barbus haasianus and three Barbus unitaeniatus with circular... -
Abundance and activity patterns of the Cape parrot (Poicephalus robustus) in two afromontane forests in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: J.O. Wirminghaus --- School of Botany & Zoology, University of Natal, South Africa Colleen T. Downs --- School of Botany & Zoology, University of Natal, South Africa M.R. Perrin --- School of Botany & Zoology, University of Natal, South Africa C.T. Symes --- School of Botany & Zoology, University of Natal, South AfricaBehaviour, movements and numbers of the rare Cape parrot (Poicephalus robustus) were investigated at two study sites to assess its conservation status and as the basis for an action plan for their conservation. Birds flew regularly to and from nearby... -
An assessment of the reproductive biology of the Marico barb Barbus motebensis from the upper Groot Marico catchment, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: D Kindler --- Department of Zoology, South Africa GM Wagenaar --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa OLF Weyl --- Centre for Invasion Biology, SAIAB, South AfricaBarbus motebensis is endemic to the Groot Marico River catchment in the North West province, South Africa, and is considered of particular conservation importance due to being Red-Listed as Vulnerable. Due to its vulnerable conservation status, the aim of this... -
Health assessment of freshwater fish species from Albasini Dam, outside a DDT-sprayed area in Limpopo province, South Africa: a preliminary study
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: UMC Nibamureke --- Department of Zoology, South Africa IEJ Barnhoorn --- Department of Zoology, South Africa GM Wagenaar --- Department of Zoology, South AfricaDuring 2006 to 2008, the water, sediment and fish in Albasini Dam, used as a reference site outside a DDT-sprayed area, had been found to be as affected as those in the nearby DDT-sprayed area were. Accordingly, the aim of... -
Enigmatic tissue in the orobranchial chamber of cardinalfishes of the genus Siphamia (Perciformes, Apogonidae)
Item type: Journal Article • Journal: African Zoology • Authors: Ofer Gon --- South African Institute for Aquatic Biodiversity, South Africa Shirley C Pinchuck --- Electron Microscopy Unit, South AfricaAn unusual tissue covering the tongue and occasionally part of the gill chamber of many species of the Indo-Pacific cardinalfish genus Siphamia is described and compared with an earlier description of a similar tissue found in the cichlid species Alcolapia... -
Aspects of reproduction of the brown mussel Perna perna at the Iture rocky beach near Cape Coast, Ghana
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: EA Krampah --- Department of Fisheries and Aquatic Sciences, Ghana K Yankson --- Department of Fisheries and Aquatic Sciences, Ghana J Blay --- Department of Fisheries and Aquatic Sciences, GhanaAspects of the reproductive biology of the brown mussel Perna perna at the Iture rocky beach near Cape Coast, Ghana, were studied from September 2014 to August 2015. The current study was aimed at providing information useful for managing the... -
When do yearling male Black-bellied Sandgrouse Pterocles orientalis reach sexual maturation?
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Mohamed Aourir --- Department of Biology, Faculty of Sciences, Morocco Mohammed Znari --- Laboratory ‘Biodiversité et Dynamique des Ecosystèmes’, Department of Biology, Faculty of Sciences, Morocco Mohamed Radi --- Laboratory ‘Biodiversité et Dynamique des Ecosystèmes’, Department of Biology, Faculty of Sciences, MoroccoIn the present study, a histological and morphometric investigation of testes in yearling male Black-bellied Sandgrouse Pterocles orientalis was performed during the reproductive period. The trial was conducted on four randomly selected yearling male birds that originated from eggs collected... -
Erythrocyte morphology of the Critically Endangered Geometric Tortoise Psammobates geometricus: effects of season, sex and age
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Shasheen Walton --- , , South Africa Margaretha Hofmeyr --- , , South AfricaLand transformation reduced the habitat of Psammobates geometricus to small isolated fragments, rendering the species vulnerable to extinction. Field biologists often use erythrocyte metrics to assess wildlife health but need baseline values to distinguish normal variations from disease or chronic... -
Invasive cervical cancer and human immunodeficiency virus (HIV) infection at Tygerberg Academic Hospital in the period 2003–2007: demographics and characteristics
Item type: Journal Article • Journal: Southern African Journal of Gynaecological Oncology • Authors: Abdiyah Diarra --- Department of Obstetrics & Gynecology, South Africa Hennie Botha --- Department of Obstetrics & Gynecology, Gynecological Oncology Unit, South AfricaBackground: Despite the prevalence of HIV infection in women with pre-invasive and invasive cervical diseases managed at the Gynaecologic Oncology unit of Tygerberg Hospital, there is a lack of local data on the effect HIV/AIDS has on invasive cervical cancer... -
Cyclic variation of the oviduct structure of Boulengerula taitana, an oviparous species of Gymnophiona: morphological changes, proliferation and apoptosis
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: C. Brun --- , France M.A. Raquet --- , France G.J. Measey --- , , South Africa J.M. Exbrayat --- , FranceFunctioning of the amphibian oviduct is the subject of many studies, but detailed understanding of caecilian reproduction exists for very few species. In this study, a description is made of morphological changes of the oviduct of the caecilian Boulengerula taitana... -
Curcumin mitigates fenthion-induced testicular toxicity in rats: histopathological and immunohistochemical study
Item type: Journal Article • Journal: African Zoology • Authors: Amel I Othman --- Department of Zoology, Faculty of Science, Egypt Manal Abdel-Hamid --- Department of Zoology, Faculty of Science, EgyptFenthion is a widely used organophosphorus pesticide in agriculture that induces different cytotoxic effects, including male reproductive toxicity. The present work aimed to study the ameliorative effects of curcumin, a potential therapeutic agent against several chronic diseases, on reproductive toxicity... -
Tumour and treatment factors influencing the outcome of chemo-radiation in stage IIB cervical cancer: a single institution experience
Item type: Journal Article • Journal: Southern African Journal of Gynaecological Oncology • Authors: Mtabeni Jemu --- Division of Radiation Oncology, South Africa Leon van Wijk --- Division of Radiation Oncology, South Africa Michelle Parker --- Radiobiology Section, Division of Radiation Oncology, South Africa Glenn Jones --- School of Clinical Medicine and Research, BahamasObjective: This study examined the effects of treatment and tumour factors on the overall survival of patients completing chemo-radiation for stage IIB cervical cancer, to identify modifiable factors that might improve outcome. -
Health and chemical burdens of fish species from polluted and hyper-eutrophic freshwater ecosystems in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GM Wagenaar --- Department of Zoology, South Africa IEJ Barnhoorn --- Department of Zoology, South AfricaThree aquatic ecosystems in South Africa, the Hartbeespoort, Klipvoor and Bospoort Dams, are classified as hyper-eutrophic, because of high nutrient loads and chemical pollution. Water and two fish species, Clarias gariepinus and Cyprinus carpio, were collected from these dams to... -
Effect of graded levels of dietary carbohydrate on growth, feed utilisation and intestinal microbial community structure in dusky kob Argyrosomus japonicus fed a pelleted diet
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: NC Mabasa --- Department of Ichthyology and Fisheries Science, South Africa PJ Britz --- Department of Ichthyology and Fisheries Science, South Africa CLW Jones --- Department of Ichthyology and Fisheries Science, South Africa A Nel --- Department of Ichthyology and Fisheries Science, South AfricaThe ability to utilise carbohydrates is limited for many predatory marine fishes. Graded levels of dietary carbohydrate (4.1–24.6%) were formulated using pregelatinised maize starch, to determine optimal levels for dusky kob Argyrosomus japonicus, an emerging mariculture finfish for which pelleted... -
Life-history traits of seabream Boops boops (Linnaeus, 1758) in the central eastern Atlantic Ocean (Canary Islands)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Massaro --- , Italy JG Pajuelo --- , SpainLife-history traits of the sparid Boops boops are studied for the first time in an isolated Atlantic population. Boops boops is a hermaphrodite species characterised by late gonochorism or non-functional hermaphroditism. The 1:0.852 ratio of females to males was significantly... -
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... -
Nevirapine in African surface waters induces liver histopathology in Oreochromis mossambicus: A laboratory exposure study
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: UMC Nibamureke --- Department of Zoology, South Africa IEJ Barnhoorn --- Department of Zoology, South Africa GM Wagenaar --- Department of Zoology, South AfricaNevirapine (NVP) is one of the HIV antiretrovirals detected recurrently in African surface waters. Liver side effects in humans were reported. Because the effects on fish are unknown, this study investigated the potential effects of NVP on selected biometric indices... -
Reproductive biology of the mackerel scad Decapterus macarellus from Cabo Verde and the implications for its fishery management
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MPV Costa --- Instituto Nacional do Desenvolvimento das Pescas [National Institute for Fisheries Development ] (INDP), Cabo Verde DRS Cruz --- Faculty of Sciences of the University of Lisbon, Portugal LS Monteiro --- Federal University of Rio Grande, Brazil KSM Evora --- University of Cabo Verde, Cabo Verde LG Cardoso --- Federal University of Rio Grande, BrazilThe mackerel scad Decapterus macarellus is of great social and economic importance to Cabo Verde citizens; however, in recent years catches have shown an unexplained decline. The harvest is regulated by way of a minimum legal size and a seasonal... -
Spawning observations of Pomadasys commersonnii in the marine section of the Knysna estuarine bay, Western Cape, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: EC Butler --- , South Africa A-R Childs --- , South Africa MKS Smith --- , South Africa RM Foster --- , South Africa WM Potts --- , South AfricaKnowledge of the location and timing of spawning events is critical for fisheries management. As is the case for many southern African fishes, the spotted grunter Pomadasys commersonnii was historically thought to reproduce in the coastal waters off KwaZulu-Natal Province... -
Bromatological and histological features of native African grasses under grazing in Brazilian semi-arid rangelands
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Talita Roberta Firemand de Lira Menor --- Universidade Federal Rural de Pernambuco, Brazil Mércia Virginia Ferreira dos Santos --- Universidade Federal Rural de Pernambuco, Brazil Janerson José Coêlho --- Universidade Federal Rural de Pernambuco, Brazil Geane Dias Gonçalves --- Universidade Federal Rural de Pernambuco, Brazil Alexandre Carneiro Leão de Mello --- Universidade Federal Rural de Pernambuco, Brazil Márcio Vieira da Cunha --- Universidade Federal Rural de Pernambuco, Brazil Amanda Maria Gallindo dos Santos --- Universidade Federal Rural de Pernambuco, Brazil Ivan Ferraz --- Instituto Agronômico de Pernambuco, Brazil José Carlos Batista Dubeux Júnior --- University of Florida, United StatesThis study evaluated the bromatological and histological features of native African grasses under grazing in Brazilian semi-arid rangelands. An experimental grid design was used in a randomised sampling method for four replicate samples of three African grasses. The grasses evaluated... -
Histological arrangements of plant tissue of different elephant grasses as influenced by their genotypes
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: --- Universidade Federal Rural de Pernambuco, Brazil --- Universidade Federal Rural de Pernambuco, Brazil --- Universidade Federal Rural de Pernambuco, Brazil --- Universidade Federal Rural de Pernambuco, Brazil --- Universidade Federal Rural de Pernambuco, Brazil --- Universidade Federal Rural de Pernambuco, Brazil --- Universidade Federal Rural de Pernambuco, Brazil --- Universidade Federal Rural de Pernambuco, BrazilElephant grass genotypes display a variety of morphological differences, influencing the nutritive value of the forage. This study evaluated the histological arrangements of the leaves and stems of different elephant-grass genotypes, two tall-sized (Elephant B and IRI-381) and two dwarfs... -
Spatial and temporal distribution of shallow-water hake Merluccius capensis off the south coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LCJ Nomxego --- Fisheries and the Environment (DFFE), South Africa OS Kjesbu --- Institute of Marine Research, Norway WHH Sauer --- Rhodes University, South Africa MR Lipinski --- Rhodes University, South AfricaThis study investigated the spatial and temporal distribution of shallow-water hake Merluccius capensis off the south coast of South Africa, using 1 807 females collected by bottom trawling during industry and research surveys between 2014 and 2016. Mean body size...