Stable isotopes in southern rockhopper penguins: foraging areas and sexual differences in the non-breeding period

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• 作者：Nina Dehnhard (1) dehnhard@orn.mpg.de
  Christian C. Voigt (2)
  Maud Poisbleau (13)
  Laurent Demongin (13)
  Petra Quillfeldt (1)
• 关键词：Southern rockhopper penguin – ; Stable isotope analysis – ; Non ; breeding season – ; Winter distribution
• 刊名：Polar Biology
• 出版年：2011
• 出版时间：November 2011
• 年：2011
• 卷：34
• 期：11
• 页码：1763-1773
• 全文大小：1.9 MB
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• 作者单位：1. Max Planck Institute for Ornithology, Vogelwarte Radolfzell, Schlossallee 2, 78315 Radolfzell, Germany2. Leibniz Institute for Zoo and Wildlife Research, Alfred-Kowalke-Str. 17, 10315 Berlin, Germany3. Department Biology鈥擡thology, Campus Drie Eiken, University of Antwerp, Universiteitsplein 1, 2610 Antwerp (Wilrijk), Belgium
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Ecology
  Oceanography
  Microbiology
  Plant Sciences
  Zoology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-2056

文摘

Southern rockhopper penguins (Eudyptes chrysocome chrysocome) have experienced severe population declines across their distribution area, potentially in response to bottom-up effects following elevated sea surface temperatures, changes in the food web and prey availability. We conducted stable isotope analysis to compare trophic levels and distribution patterns in the non-breeding period over three consecutive years, and between males and females, using egg membranes, blood cells and feathers of parent birds. Tissues representing the non-breeding season had lower δ13C values than prey sampled around the Falklands and red blood cells from breeding rockhopper penguins. In contrast, δ15N values were higher in red blood cells from the end of winter compared to those from the breeding season and compared to feathers. This indicated that rockhopper penguins left the Falkland Island area in the non-breeding season and foraged either around Burdwood Bank further south, or over the Patagonian Shelf. In winter, only males took more prey of higher trophic level than females. Inter-annual differences in isotopic values partly correlated with sea surface temperatures. However, as prey isotope samples were collected only in 1 year, inter-annual differences in penguin isotopic values may result from different foraging sites, different prey choice or different isotopic baseline values. Our study highlights the potential for stable isotope analyses to detect seasonal and gender-specific differences in foraging areas and trophic levels, while stressing the need for more sampling of isotopic baseline data.