Populations of surface-nesting seabirds at Marion Island, 1994/95-2002/03
Date
2003
Authors
Crawford R.J.M.
Cooper J.
Dyer B.M.
Greyling M.D.
Klages N.T.W.
Ryan P.G.
Petersen S.L.
Underbill L.G.
Upfold L.
Wilkinson W.
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
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.
Description
Keywords
breeding population, population decline, seabird, Indian Ocean, Indian Ocean islands, Marion Island, Prince Edward Islands, Aptenodytes, Aptenodytes patagonicus, Aves, Catharacta, Catharacta antarctica, Chrysolophus, Chrysostoma, Ciconiiformes, Diomedea, Diomedea chrysostoma, Diomedea exulans, Eudyptes, Eudyptes chrysocome, Eudyptes chrysolophus, Gallus gallus, Laridae, Larus, Larus dominicanus, Macronectes giganteus, Macronectes halli, Phalacrocorax, Phalacrocorax atriceps, Phoebetria fusca, Phoebetria palpebrata, Pygoscelis, Pygoscelis papua, Spheniscidae, Sterna, Sterna virgata, Sterna vittata
Citation
African Journal of Marine Science
25
25