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Forest inventory in the digital remote sensing age
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Chr. Kätsch A. KunnekeApplications of sampling theory together with the technical developments in the field of remote sensing have opened new paths in forest inventory. This paper presents an overview of ongoing research in the field of automatic feature extraction and pattern recognition,... -
Evaluation of an underwater biopsy probe for collecting tissue samples from bull sharks Carcharhinus leucas
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Daly --- Department of Zoology and Entomology, South Africa MJ Smale --- , South AfricaThis study evaluated the use of a novel underwater biopsy probe designed to collect muscle and dermal tissue samples from large (170–220 cm total length), free-swimming bull sharks Carcharhinus leucas. The biopsy probe tissue retention rate was 87% after 23... -
Using high-resolution satellite imagery and double sampling as a cost-effective means of collecting forest inventory data – the case of Hans Kanyinga Community Forest, Namibia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: JM Kamwi C KätschThe present study deals with the use of high-resolution satellite imagery in forest inventory of the open savanna woodlands of southern Africa. The study was carried out in Hans Kanyinga Community Forest, north-eastern Namibia. A two-phase (double) sampling design was... -
Killer whales (Orcinus orca) at Marion Island, Southern Ocean
Item type: Journal Article • Journal: African Zoology • Authors: M. Keith --- Mammal Research Institute, University of Pretoria, South Africa M.N. Bester --- Mammal Research Institute, University of Pretoria, South Africa P.A. Bartlett --- Mammal Research Institute, University of Pretoria, South Africa D. Baker --- Mammal Research Institute, University of Pretoria, South AfricaKiller whales (Orcinus orca) were studied using data obtained on an opportunistic basis between 1973 and 1996 at Marion Island (46°54’S, 37°45’E) in the Southern Indian Ocean. A clear seasonal pattern of occurrence with the main peak between October and... -
New Pleistocene avian ichnosites on South Africa’s Cape south coast
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Charles W Helm --- Nelson Mandela University, South Africa Martin G Lockley --- University of Colorado Denver, United States Andrew S Carr --- University of Leicester, United Kingdom Hayley C Cawthra --- Nelson Mandela University, South Africa Jan C De Vynck --- Nelson Mandela University, South Africa Mark G Dixon --- Nelson Mandela University, South Africa Pieter-Jan Gräbe --- Nelson Mandela University, South Africa Renée Rust --- Nelson Mandela University, South AfricaTwelve new avian ichnosites have been identified on South Africa’s Cape south coast, adding to the 29 sites previously identified. More than half of these 41 avian ichnosites are found along a 9-km stretch of coastline east of Still Bay... -
Using a low-cost drone to assess herbaceous biomass and quality in the Sahelian Rangeland ecosystems
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Haftay Hailu Gebremedhin --- College of Agriculture and Environmental Sciences, Haramaya University, Ethiopia Paulo Salgado --- Pôle Pastoralisme et Zones Sèches, Pôle de recherche de Hann, Senegal Cofélas Fassinou --- Pôle Pastoralisme et Zones Sèches, Pôle de recherche de Hann, Senegal Simon Taugourdeau --- Pôle Pastoralisme et Zones Sèches, Pôle de recherche de Hann, SenegalExisting ways of assessing rangeland plant biomass and nutritional quality mostly rely on field surveys, which are difficult to generalise across plots, along with laboratory-based techniques that entail lengthy pre-processing procedures. As a solution, drones have emerged as a promising...