2008
DOI: 10.1007/s00442-008-1199-3
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Disentangling effects of growth and nutritional status on seabird stable isotope ratios

Abstract: A growing number of studies suggest that an individual's physiology affects its carbon and nitrogen stable isotope signatures, obscuring a signal often assumed to be only a reflection of diet and foraging location. We examined effects of growth and moderate food restriction on red blood cell (RBC) and feather delta(15)N and delta(13)C in rhinoceros auklet chicks (Cerorhinca monocerata), a piscivorous seabird. Chicks were reared in captivity and fed either control (75 g/day; n = 7) or ~40% restricted (40 g/day;… Show more

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Cited by 102 publications
(102 citation statements)
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“…We also avoided carryover maternal or egg effects by collecting blood samples relatively late in the chick-rearing period (*1 month of age). The fact that there was no evidence for severe nutritional stress at either of the study sites further reinforces the validity of our comparisons (Williams et al 2007;Sears et al 2009). …”
Section: Metabolic Issuessupporting
confidence: 71%
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“…We also avoided carryover maternal or egg effects by collecting blood samples relatively late in the chick-rearing period (*1 month of age). The fact that there was no evidence for severe nutritional stress at either of the study sites further reinforces the validity of our comparisons (Williams et al 2007;Sears et al 2009). …”
Section: Metabolic Issuessupporting
confidence: 71%
“…Physiological and metabolic differences among adults and chicks influence isotopic fractionation (Williams et al 2007;Harding et al 2008;Sears et al 2009) and can also contribute to parent-offspring differences in the isotopic signatures. d…”
Section: Metabolic Issuesmentioning
confidence: 99%
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“…We thus compared stable isotope ratios obtained from feathers and blood samples that were simultaneously collected on chicks, and calculated correction factors to compare δ 13 C and δ 15 N values from these 2 tissues in adult birds. To avoid effects of growth on blood δ 15 N values (Sears et al 2009) and therefore allow comparison of chicks and adults, chicks were sampled during the late chick-rearing period, just before fledging, when growth is reduced (see Harding et al 2009b). We found differences between chick feathers and blood of -0.25 ‰ for nitrogen and 0.65‰ for carbon, and used these values as correction factors.…”
Section: Methodsmentioning
confidence: 99%