Over-representation of bird prey in pellets of South Polar Skuas

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• 作者：M. Mercedes Santos (1) mechasantos@yahoo.com.ar
  Mariana A. Juáres (12)
  Emilce F. Rombolá (1)
  Mirta L. García (23)
  Néstor R. Coria (1)
  C. Patrick Doncaster (4)
• 关键词：Antarctica – Dietary analysis – Pellet analysis – Regurgitate analysis – Sympatric
• 刊名：Journal of Ornithology
• 出版年：2012
• 出版时间：July 2012
• 年：2012
• 卷：153
• 期：3
• 页码：979-983
• 全文大小：183.4 KB
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• 作者单位：1. Departamento Biología de Predadores Tope, Instituto Antártico Argentino, Cerrito 1248, C1010AAZ Buenos Aires, Argentina2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia 1917, C1033AAJ Buenos Aires, Argentina3. División Zoología Vertebrados, Museo de La Plata, Paseo del Bosque, B1900FWA La Plata, Argentina4. Centre for Biological Sciences, Institute for Life Sciences, University of Southampton, Southampton, SO17 1BJ UK
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Zoology
  Animal Ecology
  Evolutionary Biology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1439-0361

文摘

We report the first study to compare the contents of pellets and regurgitates of South Polar Skuas, Stercorarius maccormicki, at two breeding colonies on the Antarctic Peninsula. Samples were taken across years from identified breeding pairs at Potter Peninsula in sympatry with 30–40 breeding pairs of Brown Skuas, Stercorarius antarcticus lonnbergi, and from Cierva Point with 2 pairs of Brown Skuas. In contrast to the general consensus that penguins feature in the diet most prominently in the absence of Brown Skuas, we found a much more frequent occurrence of penguin remains in samples at Potter than Cierva, but only in pellets. At Cierva, penguin feathers were largely replaced in the pellets by a high frequency of non-food moss. The rare occurrence of penguins in regurgitates from both sites is consistent with scavenging rather than active predation. The high frequency of feathers in pellets at Potter is consistent with a gut-cleansing function similar to that performed by moss, which is abundant only at Cierva. We conclude that pellets over-represent penguins in the diet. For any species that consumes feathers, the evidence must consider the alternative possibility of a non-food function of ingesting feathers.