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Browsing by Author "Crawford, R J M"

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Are Cape Cormorants (Phalacrocorax capensis) losing the competition? Dietary overlap with commercial fisheries

Author: Masiko, Oyena B Date: 2018 Characterisation of the diet of pelagic feeders can be regarded as key to development of ecosystem-based management plans, conservation of predators as well as understanding of ecological and trophic interactions. Therefore, long term studies ... Read more
Biological survey of the Prince Edward Islands, December 2008

Author: Cooper, J ; Bester, M N ; Chown, S L ; Crawford, R J M ; Daly, R ; Heynse, E ; Lamont, T ; Ryan, P G ; Shaw, J D Date: 2009 A biological survey of the Prince Edward Islands took place in December 2008. The survey repeated an earlier survey of the populations of surface-nesting seabirds on both islands and of fur seals (Arctocephalus spp.) and alien plants on Prince ... Read more
Impact of flipper-banding on breeding success of African penguins Spheniscus demersus at Robben Island: comparisons among silicone rubber bands, stainless-steel bands and no bands

Author: Barham, P J ; Underhill, L G ; Crawford, R J M ; Leshoro, T M ; Bolton, D A Date: 2008 From 2001 to 2006, two new designs of flipper bands made from silicone rubbers were tested on African penguins Spheniscus demersus at 365 nests on Robben Island, South Africa. We compared, over six years, the breeding success, from hatching ... Read more
Implications of recruitment, distribution and availability of stocks for management of South Africa's Western Cape purse-seine fishery

Author: Crawford, R J M Date: 1979 South Africa's Western Cape purse-seine fishery is situated off the country's western seaboard in the highly productive waters of the southern Benguela Current system (Cushing 1969). Management of the multi-species resource is the responsibility ... Read more
Mass on arrival of rockhopper penguins at Marion Island correlated with breeding success

Author: Crawford, R J M ; Makhado, A B ; Upfold, L ; Dyer, B M Date: 2008 For rockhopper penguins Eudyptes chrysocome at Marion Island, there were significant decreases over time in the numbers breeding and breeding success at three monitored colonies from 1985/1986 to 2006/2007, and in mass on arrival for breeding ... Read more
Populations of surface-nesting seabirds at Marion Island, 1994/5-2002/3

Author: Crawford, R J M ; Cooper, J ; Dyer, B M ; Greyling, M D ; Klages, N T W ; Ryan, P G ; Petersen, S L ; Underhill, L G ; Upfold, L ; Wilkinson, W ; De Villiers, M S ; Du Plessis, S ; Du Toit, M ; Leshoro, T M ; Makhado, A B ; Mason, M S ; Merkle, D ; Tshingana, D ; Ward, V L ; Whittington, P A Date: 2003 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 gentoo penguins Pygoscelis papua, eastern rockhopper ... Read more

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Browsing by Author "Crawford, R J M"

Browsing by Author "Crawford, R J M"

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