Year: 1987
Type: article
Abstract: Between 1952 and 1984 14,500 ,Jackass Penguins (Spheniscus demersus) were banded at breeding localities off the coast of South Africa and Namibia.Of these 185 were recovered alive or dead on the mainland and 184 were resighted alive on islands other than where they were banded.Penguins banded as chicks migrated rapidly away from their natal islands and generally moved clockwise around the southern African coast.They occasionally visited non-natal islands before returning to their natal island.Those from the eastern Cape moved westwards towards the Agulhas Bank and Benguela upwelling areas, whereas those from the southwestern Cape and Namibia remained within the Benguela system.Adults, particularly breeders, appeared to be sedentary and rarely visited other islands.Penguins banded as chicks generally sett,[ed and bred at their natal islands; the exceptions emigrated to islands in the general area of the natal island.No breeders were recorded settling or breeding at more than one island.Emigration and immigration are apparently rare in Jackass Penguins and cannot explain recent population trends of the species.
Authors: Randall, R. M., Randall, B. M., Cooper, J., La Cock, G. D., Ross, G. J. B.
Institutions: University of Cape Town, Bayworld
Language: English
Topic: Avian ecology and behavior
Subfield: Ecology
Field: Environmental Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7057485836