Kleptoparasitism by great skuas (Catharacta skua Brünn.) and Arctic skuas (Stercorarius parasiticus L.) at a Shetland seabird colony

  title={Kleptoparasitism by great skuas (Catharacta skua Br{\"u}nn.) and Arctic skuas (Stercorarius parasiticus L.) at a Shetland seabird colony},
  author={R. W. Furness},
  journal={Animal Behaviour},
Abstract Quantitative study of 467 great skua and 275 Arctic skua chases of seabirds at Foula, Shetland showed differences in the preferred victims and rates of success of each skua species. Spatial segregation of preferred victims reduces the possibility of interspecific competition. Several factors influence the outcome of chases; particularly important are the duration of chase, the speed of reaction of the victim and the method of evasion employed. These in turn are strongly influenced by… Expand
Kleptoparasitic feeding by migrating skuas in Malaga Bay, Spain
Arctic Skuas were the most numerous skua in Malaga Bay, accounting for 94% of observed chases, with ten species of victim. Adult Arctic Skuas were more successful than immatures. No difference wasExpand
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Frequency-dependent morph differences in kleptoparasitic chase rate in the polymorphic arctic skua Stercorarius parasiticus
The relationship between colouration and kleptoparasitic efficiency (success rate and chase rate) was studied in the polymorphic arctic skua, Stercorarius parasiticus, at a Mediterranean migration site to support the apostatic selection hypothesis. Expand
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It was found that in addition to kleptoparasitism, jaegers also preyed upon invertebrates (Gammarus spp.), ducks, and shorebirds, andpredation of shorebirds was mainly performed by territorial Jaegers which restrained other jaeger from the main hunting area. Expand
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Aspects of the ecology and behaviour of Great Skuas breeding on Foula were investigated by studying individually marked birds and predictions that arise from theories of territorial intrasions and copulation behaviour in birds were tested. Expand
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T Great Skua or Bonxie Stercorarius skua was brought close to extinction in Britain during the i gth century through extensive human persecution, but since 1900 the numbers breeding in Shetland haveExpand
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A description and a quantitative analysis are given of Black-headed Gull piracy on Lapwings, as observed in Sweden where such behaviour occurs mainly in autumn and early spring. It is concluded thatExpand