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Fertilising Commercial Forest Species in Southern Africa: Research Progress and Problems (Part 1)
Item type: Journal Article • Journal: South African Forestry Journal • Authors: M.A. Herbert --- , South Africa A. P.G. Schönau --- , South AfricaSince the inception of forest fertiliser research in Southern Africa in 1926, eight eucalypt, six pine and four acacia species have been tested, encompassing a wide range of sites in summer, winter and uniform rainfall areas. Marked deficiencies of P,... -
Citrus tristeza virus cross-protection of ‘Palmer’ navel orange in the Eastern Cape Province of South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S.P. van Vuuren --- , J.G.J. Maritz --- , N. Combrink --- ,Citrus tristeza virus (CTV) is endemic in southern Africa due to the abundance of the citrus brown aphid, To x -optera citricida Kirk., the main insect vector. Virus-free propagation material in the Southern African Citrus Improvement Scheme is pre-inoculated with... -
ON THE STATUS OF CLARIAS GARIEPINUS (BURCHELL) IN LARGE MAN-MADE LAKES IN RHODESIA
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: B.E. Marshall --- Department of National Parks and Wildlife Management, RhodesiaData from some large man-made lakes in Rhodesia suggest that the populations of Clarias gariepinus have declined in these lakes. The reasons for this are not clear although commercial fishing does not appear to be responsible. -
STUDIES ON THE ZOOBENTHOS OF SOME SOUTHERN CAPE COASTAL LAKES. SPATIAL AND TEMPORAL CHANGES IN THE BENTHOS OF SWARTVLEI, SOUTH AFRICA, IN RELATION TO CHANGES IN THE SUBMERGED LITTORAL MACROPHYTE COMMUNITY
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: B.R. Davies --- , South AfricaMajor changes in the benthic macro-invertebrate community of the littoral zone of Swartvlei, South Africa, took place between January and April 1978, and the equivalent months of 1980. These changes, which were associated with a collapse of the submerged littoral... -
Site and stand age effects on fertiliser responses in Pinus patula pulpwood plantations in Swaziland
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Andrew R. Morris --- Sappi Forests Research: Shaw Research Centre,Six fertiliser trials were establishedin separate stands in their 4th , 7th or 12th year on both granite and gabbro derived soils intheUsutu Forest, Swaziland. All trials compared the same factorial combination ofN, P and K fertilisers. Tree growth response... -
Why don't our stands grow even faster? Control of production and carbon cycling in eucalypt plantations
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: MG Ryan D Binkley JL StapeThe growth of Eucalyptus stands varies several fold across sites, under the influence of resource availability, stand age and stand structure. We describe a series of related studies that aim to understand the mechanisms that drive this great range in... -
Using independent nest survey data to validate changes in reporting rates of Martial Eagles between the Southern African Bird Atlas Project 1 and 2
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Arjun Amar --- DST–NRF Centre of Excellence at the Percy FitzPatrick Institute of African Ornithology, South Africa Daniël Cloete --- DST–NRF Centre of Excellence at the Percy FitzPatrick Institute of African Ornithology, South Africa Madel Whittington --- Birds of Prey Programme, Endangered Wildlife Trust, Nossob camp, South AfricaRepeat monitoring is vital to measure biodiversity change. However, monitoring protocols may change, as survey techniques improve or different questions are asked. Such modifications may cause difficulties when examining changes in wildlife populations. The Southern African Bird Atlas Project (SABAP)... -
Alarming decline and range reduction of the highly threatened Great Bustard Otis tarda in Morocco
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Juan Carlos Alonso --- Department of Evolutionary Ecology, Spain Carlos Palacín --- Department of Evolutionary Ecology, Spain Alejandro Onrubia --- Fundación MIGRES, Spain Rachid Aboulouafae --- SPCDRN/DREFLCD du Rif, Haut Commissariat aux Eaux et Forêts et à la Lutte Contre la Désertification (HCEFLCD), Morocco Mohamed Amezian --- GREPOM Unité régionale Tanger-Tétouan, Morocco Abdelaziz El Idrissi Essougrati --- GREPOM Unité régionale de Rabat, Morocco Rachid El Khamlichi --- GREPOM Unité régionale Tanger-Tétouan, Morocco Mohamed Noaman --- Service de la Conservation de la Flore et de la Faune Sauvage, MoroccoA Great Bustard Otis tarda survey carried out in spring 2015 in Morocco confirmed the decline of this highly endangered population. Bustards were only seen at two of the seven leks occupied ten years ago. The total number of birds... -
Analysis of genetic diversity in Rose’s mountain toadlet (Capensibufo rosei) using novel microsatellite markers
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Jessica M. da Silva --- , South Africa Kevin A. Feldheim --- , USA Ryan J. Daniels --- , South Africa Shelley Edwards --- , South Africa Krystal A. Tolley --- , South AfricaOn the Cape Peninsula, Capensibufo rosei is known from only two isolated breeding populations within Table Mountain National Park. Because of its declining state, there is an urgent need to understand the genetic diversity, population structure and patterns of movement... -
Kalahari vulture declines, through the eyes of meerkats
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Jack B Thorley --- Department of Zoology, UK Tim Clutton-Brock --- Department of Zoology, UKVulture populations are experiencing rapid declines across the globe. While the declines have been most precipitous in Asia, recent reports suggest African populations are likewise imminently threatened. As the factors underlying these general population trends are multifaceted and will vary... -
Productivity of the declining Bearded Vulture Gypaetus barbatus population in southern Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Sonja C Krüger --- Ezemvelo KZN Wildlife, South Africa Arjun Amar --- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, South AfricaRecent research has shown that anthropogenic influences are driving the abandonment of breeding territories in the declining southern African Bearded Vulture Gypaetus barbatus meridionalis population. Survival rates appear to be low (86% for adults) due to poisoning and collisions with... -
A mass mortality of fishes caused by receding water levels in the vegetated littoral zone of the West Kleinemonde Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AK Whitfield --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaOn 15 November 2017 the mouth of the West Kleinemonde Estuary breached following heavy catchment rains and increased river flow. The water level in the estuary following mouth opening decreased by 1.65 m within 24 h, resulting in an almost... -
Hooded Vultures Necrosyrtes monachus nearly extirpated from Edo State, Nigeria: a report on the avian scavenger community
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Esther Nosazeogie --- AP Leventis Ornithological Research Institute, University of Jos, Nigeria Talatu Tende --- AP Leventis Ornithological Research Institute, University of Jos, Nigeria Ara Monadjem --- Department of Biological Sciences, SwazilandAvian scavengers, by feeding on carrion and other organic matter, provide critical ecosystem services. Vultures, the only obligate avian scavengers, have reportedly experienced massive population declines in Africa yet current knowledge regarding their status in most West African countries is... -
The status and conservation of the Cape Gannet Morus capensis
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Richard B Sherley --- Environment and Sustainability Institute/Centre for Ecology and Conservation, United Kingdom Robert JM Crawford --- Department of Environment, Forestry and Fisheries (DEFF), South Africa Bruce M Dyer --- Department of Environment, Forestry and Fisheries (DEFF), South Africa Jessica Kemper --- African Penguin Conservation Project, Namibia Azwianewi B Makhado --- Department of Environment, Forestry and Fisheries (DEFF), South Africa Makhudu Masotla --- Department of Environment, Forestry and Fisheries (DEFF), South Africa Lorien Pichegru --- DST-NRF Centre of Excellence at the FitzPatrick Institute of African Ornithology, Department of Biological Sciences, South Africa Pierre A Pistorius --- DST-NRF Centre of Excellence at the FitzPatrick Institute of African Ornithology, Department of Biological Sciences, South Africa Jean-Paul Roux --- Ministry of Fisheries and Marine Resources, Namibia Peter G Ryan --- DST-NRF Centre of Excellence at the FitzPatrick Institute of African Ornithology, Department of Biological Sciences, South Africa Desmond Tom --- Ministry of Fisheries and Marine Resources, Namibia Leshia Upfold --- Department of Environment, Forestry and Fisheries (DEFF), South Africa Henning Winker --- Department of Environment, Forestry and Fisheries (DEFF), South AfricaThe Cape Gannet Morus capensis is one of several seabird species endemic to the Benguela upwelling ecosystem (BUS) but whose population has recently decreased, leading to an unfavourable IUCN Red List assessment. Application of ‘JARA’ (‘Just Another Red-List Assessment,’ a... -
Traditional belief systems and trade in vulture parts are leading to the eradication of vultures in Nigeria: an ethno-ornithological study of north-central Nigeria
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Michael M Williams --- , Nigeria Ulf Ottosson --- , Nigeria Talatu Tende --- , Nigeria Justus P Deikumah --- , GhanaThe population of various species of vultures are declining rapidly across Africa, with noticeable declines in most areas including protected areas. This sudden decline of vultures in African countries, especially Nigeria, is quite alarming. One of the most common species... -
The utility of serial prolactin sampling in healthy adult volunteers
Item type: Journal Article • Journal: Journal of Endocrinology, Metabolism and Diabetes of South Africa • Authors: Reinhardt Dreyer --- , South Africa Amanda Beukes --- , South Africa Mariza Hoffmann --- , South Africa Wessel Meyer --- , South Africa Ankia Coetzee --- , South AfricaBackground: Stress hyperprolactinemia is a common cause of elevated prolactin (PRL) and often leads to additional investigation and radiation exposure. The results of PRL serial sampling in healthy adult volunteers to determine the utility of delayed collection are reported. -
An enigmatic mortality event in the only population of the Critically Endangered Cameroonian frog Xenopus longipes
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: DavidC. Blackburn --- University of Kansas, USA BenJ. Evans --- McMaster University, Canada AllanP. Pessier --- San Diego Zoo's Institute for Conservation Research, USA VanceT. Vredenburg --- San Francisco State University, USAContemporary global declines and mortality events in amphibian populations have been often attributed to infectious disease and climate change, separately and in combination. We report on an enigmatic mortality event in the only known population of the Critically Endangered frog... -
Hooded Vultures Necrosyrtes monachus are still declining in West Africa: a nearly 50-year assessment study (1969–2019)
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Clément Daboné --- University Centre of Tenkodogo/University Thomas Sankara, Burkina Faso Idrissa Ouédraogo --- University Joseph Ki-Zerbo, Burkina Faso Adama Ouéda --- University Joseph Ki-Zerbo, Burkina Faso Lindy J Thompson --- , South Africa Peter DM Weesie --- University of Groningen, The NetherlandsLarge-scale declines in vulture populations have been recorded in West Africa. One concern is that the current trend in Hooded Vulture Necrosyrtes monachus populations in West Africa is poorly known. To help fill this knowledge gap, we conducted nationwide road... -
Susceptibility of dwarf chameleons to climate and land use change: a vulnerability framework for conservation planning
Item type: Journal Article • Journal: African Zoology • Authors: Tyron K Clark --- University of the Witwatersrand, South Africa Graham J Alexander --- University of the Witwatersrand, South Africa Krystal A Tolley --- South African National Biodiversity Institute, South AfricaClimate and land use changes are eroding biodiversity globally, and reptiles are highlighted as being particularly susceptible. In South Africa, global changes threaten the persistence of an assemblage of dwarf chameleons (Bradypodion) located in a biodiversity hotspot. We used ecological... -
A review of parasitic fauna of Egyptian amphibia
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Osama MS Mostafa --- Ain Shams University, Egypt Kareem Morsy --- King Khalid University, Saudi Arabia Saad Bin Dajem --- King Khalid University, Saudi Arabia Mahmoud HY Fedda --- Ain Shams University, EgyptThe world's biodiversity is facing a significant threat, and amphibians are particularly susceptible, being the most vulnerable vertebrate group globally. The decline in the amphibian population has been attributed, in part, to parasitic infection. Egyptian amphibian fauna was poorly studied,... -
Monitoring survival probabilities of Cape Vultures Gyps coprotheres in South Africa, using GPS tracking data
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Sophie Pulcella --- Knowsley Safari, Prescot, United Kingdom Kerri Wolter --- Vulpro NPC, South Africa Juliana Pinto --- Vulpro NPC, South Africa Brian Kuhn --- Vulpro NPC, South Africa Wolfgang Fiedler --- Max Planck Institute of Animal Behaviour, GermanyThe Cape Vulture Gyps coprotheres is a species of Old-World vulture endemic to southern Africa. Currently listed as ‘Vulnerable’ by the IUCN, they face increasing threats from anthropogenic hazards, such as collisions with man-made infrastructure and poisoning events, leading to... -
Updates on population status of vultures in Nazinga Game Ranch, Burkina Faso
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Clément Daboné --- Animal Biology and Ecology, University Centre of Tenkodogo/Thomas Sankara University, Burkina Faso Idrissa Ouédraogo --- Laboratory of Animal Biology and Ecology, Joseph Ki-Zerbo University, Burkina Faso Idrissa Ouédraogo --- Laboratory of Animal Biology and Ecology, Joseph Ki-Zerbo University, Burkina Faso Adama Ouéda --- Laboratory of Animal Biology and Ecology, Joseph Ki-Zerbo University, Burkina Faso Wendengoudi Guenda --- Laboratory of Animal Biology and Ecology, Joseph Ki-Zerbo University, Burkina Faso Peter DM Weesie --- Integrated Research on Energy, Environment and Society, University of Groningen, The NetherlandsIn the early 2000s, the ornithological community was alerted to the vulture population decline in West Africa. Since then, the situation of vultures in this area has not been updated, specifically in Burkina Faso’s protected areas. To find out more,...