Stable isotopes identify age- and sex-specific dietary partitioning and foraging habitat segregation in southern giant petrels breeding in Antarctica and southern Patagonia

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• 作者：Andrea Raya Rey (1) arayarey@cadic-conicet.gob.ar
  Michael Polito (2)
  Diego Archuby (3)
  Néstor Coria (4)
• 刊名：Marine Biology
• 出版年：2012
• 出版时间：June 2012
• 年：2012
• 卷：159
• 期：6
• 页码：1317-1326
• 全文大小：408.8 KB
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• 作者单位：1. Consejo Nacional de Investigaciones Científicas y Técnicas, Centro Austral de Investigaciones Científicas, Houssay 200, 9410, Ushuaia, Tierra del Fuego, Argentina2. Department of Biology and Marine Biology, University of North Carolina Wilmington, 601 South College Road, Wilmington, NC 28403, USA3. Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto Antártico Argentino, Cerrito 1248, C1010AAZ Buenos Aires, Argentina4. Departamento de Ciencias Biológicas, Instituto Antártico Argentino, Cerrito 1248, C1010AAZ Buenos Aires, Argentina
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Ecology
  Biomedicine
  Oceanography
  Microbiology
  Zoology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1793

文摘

We examined the isotopic signatures (δ13C, δ15N) of adult body feathers from southern giant petrels Macronectes giganteus collected at two breeding colonies in Antarctica (Potter Peninsula and Cape Geddes) and one in southern Patagonia (Observatorio Island), as well as in whole blood collected from adults of both sexes at each Antarctic colonies and from chicks at Potter Peninsula. As body feather moult is a continuous process in giant petrels, feathers provide an integrated annual signal of an adult’s diets and foraging habitats. In contrast, the stable isotope values of adult and chick blood are reflective of their diets during the breeding season. We found that sex-specific dietary segregation in adults breeding in Antarctica was notable during the breeding season (blood samples) but absent when examined across the entire year (feather samples). In addition, blood stable isotope values differed between chicks and adults, indicating that adults provision their offspring with a relatively higher amount of penguin and seal prey that what they consume themselves. This finding confirms previous work that suggests that chicks are preferentially fed with prey of presumably higher nutritional value such as carrion. Finally, based on isotopic differences between major oceanographic zones in the Southern Ocean, our data indicate population-specific differences in foraging distribution, with Antarctic populations move seasonally between Antarctic and subantarctic zones, while Patagonian populations likely forage in subtropical waters and in continental shelf habitats year-round.