Populations of surface-nesting seabirds at Marion Island, 1994/5-2002/3

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dc.contributor.authorCrawford, R J M
dc.contributor.authorCooper, J
dc.contributor.authorDyer, B M
dc.contributor.authorGreyling, M D
dc.contributor.authorKlages, N T W
dc.contributor.authorRyan, P G
dc.contributor.authorPetersen, S L
dc.contributor.authorUnderhill, L G
dc.contributor.authorUpfold, L
dc.contributor.authorWilkinson, W
dc.contributor.authorDe Villiers, M S
dc.contributor.authorDu Plessis, S
dc.contributor.authorDu Toit, M
dc.contributor.authorLeshoro, T M
dc.contributor.authorMakhado, A B
dc.contributor.authorMason, M S
dc.contributor.authorMerkle, D
dc.contributor.authorTshingana, D
dc.contributor.authorWard, V L
dc.contributor.authorWhittington, P A
dc.date.accessioned2018-05-17T08:02:55Z
dc.date.available2018-05-17T08:02:55Z
dc.date.issued2003
dc.date.updated2016-01-18T09:53:04Z
dc.description.abstractDuring 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 penguins Eudyptes chrysocome filholi, Crozet shags Phalacrocorax [atriceps] melanogenis and probably macaroni penguins E. chrysolophus are most plausibly attributed to an altered availability of food. Decreases in numbers of dark-mantled sooty albatrosses Phoebetria fusca, light-mantled sooty albatrosses P. palpebrata, southern giant petrels Macronectes giganteus and possibly northern giant petrels M. halli may have resulted from mortality of birds in longline fisheries. However, populations of wandering Diomedea exulans and grey-headed Thalassarche chrysostoma albatrosses fluctuated around a stable level. Numbers of Subantarctic skuas Catharacta antarctica and kelp gulls Larus dominicanus breeding at Marion Island also decreased. Kerguelen Sterna virgata and Antarctic S. vittata terns remain scarce at the island. Trends for king penguins Aptenodytes patagonicus were not reliably gauged, but numbers probably remained stable or increased. There were large fluctuations in numbers of king penguin chicks surviving to the end of winter.
dc.identifierhttp://dx.doi.org/10.2989/18142320309504032
dc.identifier.apacitationCrawford, R. J. M., Cooper, J., Dyer, B. M., Greyling, M. D., Klages, N. T. W., Ryan, P. G., ... Whittington, P. A. (2003). Populations of surface-nesting seabirds at Marion Island, 1994/5-2002/3. <i>African Journal of Marine Science</i>, http://hdl.handle.net/11427/28094en_ZA
dc.identifier.chicagocitationCrawford, R J M, J Cooper, B M Dyer, M D Greyling, N T W Klages, P G Ryan, S L Petersen, et al "Populations of surface-nesting seabirds at Marion Island, 1994/5-2002/3." <i>African Journal of Marine Science</i> (2003) http://hdl.handle.net/11427/28094en_ZA
dc.identifier.citationCrawford, R. J. M., Cooper, J., Dyer, B. M., Greyling, M. D., Klages, N. T. W., Ryan, P. G., ... & Klages N. T. (2003). Populations of surface-nesting seabirds at Marion Island, 1994/95–2002/03. African Journal of Marine Science, 25(1), 427-440.
dc.identifier.ris TY - AU - Crawford, R J M AU - Cooper, J AU - Dyer, B M AU - Greyling, M D AU - Klages, N T W AU - Ryan, P G AU - Petersen, S L AU - Underhill, L G AU - Upfold, L AU - Wilkinson, W AU - De Villiers, M S AU - Du Plessis, S AU - Du Toit, M AU - Leshoro, T M AU - Makhado, A B AU - Mason, M S AU - Merkle, D AU - Tshingana, D AU - Ward, V L AU - Whittington, P A AB - 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 penguins Eudyptes chrysocome filholi, Crozet shags Phalacrocorax [atriceps] melanogenis and probably macaroni penguins E. chrysolophus are most plausibly attributed to an altered availability of food. Decreases in numbers of dark-mantled sooty albatrosses Phoebetria fusca, light-mantled sooty albatrosses P. palpebrata, southern giant petrels Macronectes giganteus and possibly northern giant petrels M. halli may have resulted from mortality of birds in longline fisheries. However, populations of wandering Diomedea exulans and grey-headed Thalassarche chrysostoma albatrosses fluctuated around a stable level. Numbers of Subantarctic skuas Catharacta antarctica and kelp gulls Larus dominicanus breeding at Marion Island also decreased. Kerguelen Sterna virgata and Antarctic S. vittata terns remain scarce at the island. Trends for king penguins Aptenodytes patagonicus were not reliably gauged, but numbers probably remained stable or increased. There were large fluctuations in numbers of king penguin chicks surviving to the end of winter. DA - 2003 DB - OpenUCT DP - University of Cape Town J1 - African Journal of Marine Science LK - https://open.uct.ac.za PB - University of Cape Town PY - 2003 T1 - Populations of surface-nesting seabirds at Marion Island, 1994/5-2002/3 TI - Populations of surface-nesting seabirds at Marion Island, 1994/5-2002/3 UR - http://hdl.handle.net/11427/28094 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/28094
dc.identifier.vancouvercitationCrawford RJM, Cooper J, Dyer BM, Greyling MD, Klages NTW, Ryan PG, et al. Populations of surface-nesting seabirds at Marion Island, 1994/5-2002/3. African Journal of Marine Science. 2003; http://hdl.handle.net/11427/28094.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Biological Sciencesen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.sourceAfrican Journal of Marine Science
dc.source.urihttps://www.tandfonline.com/toc/tams20/current
dc.subject.otherAlbatrosses
dc.subject.otherCrozet Shag
dc.subject.otherGiant Petrels
dc.subject.otherKelp Gull
dc.subject.otherMarion Island
dc.subject.otherPenguins
dc.subject.otherPopulation Size
dc.subject.otherSubantarctic Skua
dc.subject.otherTerns
dc.titlePopulations of surface-nesting seabirds at Marion Island, 1994/5-2002/3
dc.typeJournal Article
uct.type.filetypeText
uct.type.filetypeImage
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