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Rapid viability tests for kernels of grain sorghum (Sorghum bicolor (L.) Moench.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.A. van de Venter --- , Republic of South Africa G. Barla-Szabo --- , Republic of South AfricaVarious procedures were evaluated for their potential as rapid viability tests for kernels of grain sorghum (Sorghum bicolor (L.) Moench.). The tests included were a specific gravity test, a conductivity test (with drastically reduced soaking periods), the determination of glutamic... -
Germination strategies of Strandveld Succulent Karoo plant species for revegetation purposes: III Effect of relative humidity and storage site on seed viability
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.J. de Villiers --- Department of Botany, Republic of South Africa M.W. van Rooyen --- Department of Botany, Republic of South Africa G.K. Theron --- Department of Botany, Republic of South AfricaChanges in seed viability owing to fluctuations in environmental conditions (temperature and relative humidity) are crucial factors to consider during post-mining revegetation efforts in the Strandveld Succulent Karoo. The effect of relative humidity and storage site on seed viability was... -
Socio-economic characteristics of gillnet and beach-seine fishers in the Western Cape, South Africa
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: K. Hutchings S. J. Lamberth J. K. TurpieData collected by questionnaire and telephone surveys conducted during 1998 and 1999 are used to describe the socio-economic characteristics of inshore netfishers in the Western Cape. Approximately two-thirds of netfishers work or have worked in other fishing sectors and a... -
THE EFFECT OF AGITATION AND TURBULENCE OF THE GROWTH MEDIUM ON THE GROWTH AND VIABILITY OF MICROCYSTIS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: G. H.J. Krüger --- Departement of Botany, South Africa J.N. Eloff --- Departement of Botany, South AfricaObservation of natural blooms of Microcystis, suggested that increased turbulence plays a role in retarding bloom formation of Microcystis. In laboratory experiments the influence of turbulence mediated by a magnetic stirrer on the growth and viability of Microcystis in batch... -
Physical and chemical treatments for enhancing seed germination of Oldman saltbush (Atriplex nummularia)
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: MMW Abu-Zanat N SamarahThis study was conducted to improve the seed germination of Oldman saltbush (Atriplex nummularia), which is an important fodder shrub commonly used for revegetation of degraded rangelands in the West Asia and North Africa regions. Seeds with and without their... -
Sustainable income-generating projects for HIV-affected households in Zimbabwe: evidence from two high-density suburbs
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: MunyaradziJ Mutenje InnocentW Nyakudya Constance Katsinde TichaedzaJ ChikuvireAn estimated 25% of the adults in urban areas of Zimbabwe are living as HIV-positive. In HIV-affected households the need for income increases with the demand for medicines, food and funeral costs. One way to mitigate this effect of the... -
Female-biased mortality in African penguins
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Pichegru --- DST/NRF Centre of Excellence at the Percy FitzPatrick Institute of African Ornithology, Department of Zoology, South Africa NJ Parsons --- Southern African Foundation for the Conservation of Coastal Birds, South AfricaSex-biased mortality can increase the risk of extinction of threatened populations. Numbers of the endangered African penguin Spheniscus demersus are decreasing rapidly and the smaller size of females, associated with their higher foraging effort during the breeding season, may place... -
Wind farms threaten southern Africa's cliff-nesting vultures
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Ian Rushworth --- Scientific Services, South Africa Sonja Krüger --- Scientific Services, South AfricaWind farms have been shown to cause bird mortality in many studies. Proposals for the development of wind farms in Lesotho, which is core habitat for small and declining populations of the regionally Endangered Bearded Vulture Gypaetus barbatus meridionalis and... -
Seed quality characteristics of a bambara groundnut (Vigna subterranea L.) landrace differing in seed coat colour
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Tendai P Chibarabada --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Albert T Modi --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Tafadzwanashe Mabhaudhi --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South AfricaBambara groundnut (Vigna subterranea L.) is an underutilised African legume that fits the same ecological niche as Arachis hypogea. It is still cultivated using landraces and little is known about their seed quality. The current study evaluated seed quality characteristics... -
Current conservation status of the Blue Swallow Hirundo atrocaerulea Sundevall 1850 in Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Steven W Evans --- SARCHI Chair on Biodiversity Value and Change, School of Mathematical and Natural Sciences, South Africa Ara Monadjem --- Department of Biological Sciences, South Africa Lizanne Roxburgh --- Percy FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, South Africa Andrew E McKechnie --- Percy FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, Department of Zoology and Entomology, South Africa Ellizabeth M Baker --- Tanzanian Bird Atlas Project, United Republic of Tanzania Robert B Kizungu --- Organisation of Biodiversity Information and Conservation in Congo Kinshasa, Democratic Republic of Congo Ian T Little --- Endangered Wildlife Trust, South Africa Fadzai Matsvimbo --- BirdLife Zimbabwe, Zimbabwe Ronald K Mulwa --- National Museums of Kenya and Nature Kenya, Kenya Daniel Mwizabi --- Zambian Wildlife Authority, Zambia Dianah Nalwanga --- Nature Uganda, Uganda Kariuki Ndang'ang'a --- BirdLife International, Africa Partnership Secretariat, Kenya Leigh Combrink --- Endangered Wildlife Trust, South AfricaThe global Blue Swallow Hirundo atrocaerulea was classified as Vulnerable in 2010 on account of its small and rapidly declining population estimated at less than 1 500 pairs. We undertook this study to gain a better understanding of the current... -
Potential release sites and strategies for a Bearded Vulture Gypaetus barbatus reintroduction in South Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Christiaan W Brink --- , South Africa Sonja Krüger --- , South Africa Arjun Amar --- , South AfricaThe southern African population of Bearded Vultures Gypaetus barbatus has declined rapidly and it is threatened with extinction. In response to this decline and the additional threats of wind farm developments in the core of the species’ range, it has... -
Estimation of lumber recovery for small-scale mobile sawmills in Tanzania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Ernest William Mauya --- Sokoine University of Agriculture, Tanzania Lynder Gesase --- Sokoine University of Agriculture, Tanzania Gabriel Mangi --- Sokoine University of Agriculture, Tanzania Gilberth Temba --- Sokoine University of Agriculture, Tanzania Diana Tesha --- Sokoine University of Agriculture, Tanzania Sami Madundo --- Sokoine University of Agriculture, Tanzania Nandera Juma Lolila --- Sokoine University of Agriculture, Tanzania Justo Ndyanabo Jonas --- Sokoine University of Agriculture, TanzaniaLumber recovery is an important parameter in determining the production efficiency and viability of mobile sawmilling operations. In this study, lumber recoveries for mobile sawmilling machines operating in four different locations in Tanzania were estimated. A total of 11 mobile... -
Financial and economic viability of cassava peeling technology and constraints to adoption in Ghana
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Camillus Abawiera Wongnaa --- Kwame Nkrumah University of Science and Technology, Ghana Michael Kwame Asempah --- Kwame Nkrumah University of Science and Technology, Ghana Mamudu Abunga Akudugu --- University for Development Studies, Ghana Emmanuel Abokyi --- Ghana Institute of Management and Public Administration (GIMPA), Ghana Dadson Awunyo-Vitor --- Kwame Nkrumah University of Science and Technology, GhanaThe manual peeling of cassava is laborious, prone to injuries, and limits processing speed, contributing to postharvest losses due to cassava’s highly perishable nature. To address this challenge, this study aims to evaluate the financial and economic viability of installing... -
Reduced Blue Crane Grus paradisea breeding productivity in intensive agricultural landscapes
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Christie A Craig --- FitzPatrick Institute of African Ornithology, Department of Biological Sciences, University of Cape Town, South Africa Bradley K Gibbons --- African Crane Conservation Programme, Endangered Wildlife Trust/International Crane Foundation, South Africa Tanya Smith --- African Crane Conservation Programme, Endangered Wildlife Trust/International Crane Foundation, South Africa Glenn I Ramke --- African Crane Conservation Programme, Endangered Wildlife Trust/International Crane Foundation, South Africa Peter G Ryan --- FitzPatrick Institute of African Ornithology, Department of Biological Sciences, University of Cape Town, South AfricaWe compare Blue Crane Grus paradisea breeding productivity in the Western Cape wheatlands in Overberg and Swartland (2018–2021), Karoo (2009–2011) and eastern grasslands (2009–2011 and 2013). Productivity was higher in the grasslands (0.95 fledglings/attempt, 95% CI = 0.86–1.30, n =...