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Generation of random orthogonal matrices
In order to generate a random orthogonal matrix distributed according to Haar measure over the orthogonal group it is natural to start with a matrix of normal random variables and then factor it byExpand
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Populations of Surface-nesting Seabirds at Marion Island, 1994/95–2002/03
During the 1990s and early 2000s, populations of surface-nesting seabirds at Marion Island showed different trends, but for the majority of species numbers decreased. Reduced numbers of gentooExpand
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Top predators in the Benguela ecosystem — implications of their trophic position
Many top predators in the Benguela ecosystem feed on prey species targeted by commercial fisheries. Their roles as indicators of the state of exploited prey resources, as competitors with commercialExpand
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Leach's storm petrels Oceanodroma leucorhoa off southern Africa: breeding and migratory status, and measurements and mass of the breeding population
Leach's storm petrel Oceanodroma leucorhoa have bred at Dyer Island since at least 1995; a review of earlier records in the light of this discovery indicates that breeding has almost occurred sinceExpand
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Flocking as an anti-predator strategy in doves
Abstract The paper reports on a field experiment designed to investigate the initial detection of an aerial predator and the escape response by wild laughing doves Streptopelia senegalensis whileExpand
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Mortality and survival of African Penguins Spheniscus demersusinvolved in the Apollo Seaoil spill: an evaluation of rehabilitation efforts
The bulk ore carrier Apollo Seasank near Dassen Island, South Africa, on 20 June 1994 during a period of winter storms. Approximately 10 000 African (Jackass) Penguins Spheniscus demersuswere oiled,Expand
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Management of avian cholera Pasteurella multocida outbreaks on Dyer Island, South Africa, 2002–2005
In 2002 there was a widespread epizootic involving seabirds on five of the offshore islands of the Western Cape, South Africa. Since then, avian cholera Pasteurella multocida outbreaks have beenExpand
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Secretarybird Sagittarius serpentarius Population Trends and Ecology: Insights from South African Citizen Science Data
Data from two long-term citizen science projects were used to examine the status and ecology of a Red List species, the Secretarybird Sagittarius serpentarius (Vulnerable), in South Africa. The firstExpand
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Primary molt and transequatorial migration of the Sooty shearwater
Examination of beached corpses of 244 Sooty Shearwaters (Puffinus griseus) from the southwestern Cape, South Africa, showed that simple descendent primary molt occurs from December to June, with mostExpand
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