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      Skuas (Stercorarius spp.) moult body feathers during both the breeding and inter-breeding periods: implications for stable isotope investigations in seabirds

      1 , 2
      Ibis
      Wiley

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          Linking Winter and Summer Events in a Migratory Bird by Using Stable-Carbon Isotopes

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            Using Stable Isotopes to Determine Seabird Trophic Relationships

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              Factors that influence assimilation rates and fractionation of nitrogen and carbon stable isotopes in avian blood and feathers.

              By switching great skuas Catharacta skua from one isotopically distinct diet to another, we measured diet-tissue discrimination factors and tested the assumption that dietary nitrogen and carbon isotope signatures are incorporated into blood and feathers at similar rates. We also examined the effects of metabolic rate and looked for evidence of isotopic routing. We found that blood delta(15)N and delta(13)C signatures altered after the diet switch at similar rates (14.4 d and 15.7 d, respectively). Qualitative analyses imply that the same was true with feathers. Mass balance calculations suggest that only a small amount of lipid is likely to be involved in the synthesis of blood and feathers. Differences in diet-tissue discrimination factors before and after the diet switch may mean that toward the end of the experiment, some of the nutrients for blood synthesis had been coming from stores. Repeated measures mixed models provided evidence that increases in metabolic rate might accelerate fractional turnover rates in blood. There is a need for more laboratory-based experimental isotope studies in order to address further questions that this study has raised.
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                Author and article information

                Journal
                Ibis
                Ibis
                Wiley
                00191019
                April 2017
                April 2017
                December 05 2016
                : 159
                : 2
                : 266-271
                Affiliations
                [1 ]Laboratorio Ecotono; INIBIOMA (Universidad Nacional del Comahue - CONICET); Quintral 1250 (R8400FRF) San Carlos de Bariloche Argentina
                [2 ]Centre d'Etudes Biologiques de Chizé; UMR 7372 du CNRS-Université de La Rochelle; 79360 Villiers-en-Bois France
                Article
                10.1111/ibi.12441
                74f100bc-32fb-4603-99e3-c0af3b279d0e
                © 2016

                http://doi.wiley.com/10.1002/tdm_license_1.1

                http://onlinelibrary.wiley.com/termsAndConditions#vor

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