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Documents disponibles écrits par cet auteur (9)
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Article
O. Curtis, Auteur ; R. E. Simmons, Auteur ; A. R. Jenkins, AuteurBlack Harrier Circus maurus is a rare southern African endemic that may have lost over 50% of its core breeding habitat in the last century as a result of extensive land transformation by agriculture, invasive alien vegetation and urbanization i[...]
Article
R. E. Simmons, Auteur ; J. Kemper, AuteurOnly three mainland sites are known among the total 27 breeding colonies of the African Penguin, Spheniscus demersus: two in South Africa and one in Namibia. The latter is a unique cave site near the northern extreme of the species' range on the[...]
Article
R. E. Simmons, Auteur ; P. Barnard, Auteur ; W. R. J. Dean, Auteur ; G. F. Midgley, Auteur ; W. Thuiller, Auteur ; G. Hughes, AuteurGlobal climate warming, now conclusively linked to anthropogenically-increased CO(2) levels in the earth's atmosphere, has already had impacts on the earth's biodiversity and is predicted to threaten more than 1 million species with extinction b[...]
Article
R. E. Simmons, AuteurA review of Namibian shorebird densities over two decades and two additional visits to the coastal diamond-mining areas at Elizabeth Bay, southern Namibia, were undertaken to assess the long-term influence of mining activity on density of shoreb[...]
Article
Flamingo 'rescue' in Etosha National Park, 1994: technical, conservation and economic considerations
V. E. Fox, Auteur ; P. M. Lindeque, Auteur ; R. E. Simmons, Auteur ; H. H. Berry, Auteur ; C. Brain, Auteur ; R. Braby, AuteurDuring April 1994, 144 Greater Flamingo Phoenicopterus ruber chicks were taken from Etosha Pan, Namibia, following drying of the shallow water and the death of hundreds of chicks. The captured chicks ranged from approximately 2 weeks to 2 months[...]
Article
R. E. Simmons, Auteur ; D. G. Allan, AuteurLike many other southern African rivers, the avifaunal richness and abundance of the Orange River, southern Africa's longest, remains virtually unknown. Given that the Orange River runs through hyper-arid regions in its lower reaches, its linear[...]
Article
J. Braby, Auteur ; R. J. Braby, Auteur ; N. Braby, Auteur ; R. E. Simmons, AuteurBecause resources and funds available for the conservation management of many threatened species are limited, it is important to determine the effectiveness of different conservation measures aimed at protecting threatened species. The globally [...]
Article
P. LLoyd, Auteur ; R. M. Little, Auteur ; T. M. Crowe, Auteur ; R. E. Simmons, AuteurThis study examines whether rainfall and its effects on food availability control the timing of migratory movements and breeding activity in the Namaqua Sandgrouse, Pterocles namaqua. Namaqua Sandgrouse exhibit a pattern of partial migration bet[...]
Article
R. E. Simmons, Auteur ; P. Barnard, Auteur ; I. G. Jamieson, AuteurThe ability of wetland birds to rapidly find and exploit ephemeral pans is well known in arid lands, but the episodic nature of such events means that the methods employed are poorly understood. Birds may: (i) wander randomly until wetlands are [...]
