Differences in stable isotopes in blood and feathers of seabirds are consistent across species, age and latitude: implications for food web studies

Quillfeldt, P., Bugoni, L., McGill, R.A.R. , Masello, J. F. and Furness, R.W. (2008) Differences in stable isotopes in blood and feathers of seabirds are consistent across species, age and latitude: implications for food web studies. Marine Biology, 155(6), pp. 593-598. (doi:10.1007/s00227-008-1048-2)

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Publisher's URL: http://dx.doi.org/10.1007/s00227-008-1048-2

Abstract

Stable isotopes of growing feathers and blood both represent assimilated diet, and both tissues are used to study the diet and foraging distribution of marine and terrestrial birds. Although most studies have assumed that both tissues represent a difference of one trophic level to diet, the enrichment factors of blood and feathers may differ, especially where endogenous reserves are used as precursors during feather synthesis. In this study, we compare carbon and nitrogen stable isotopes of blood and simultaneously growing feathers of five species of Procellariiformes, representing five genera, different geographical regions and different life stages (chicks and adults). In all species, feathers were enriched in N-15 and C-13 compared with blood. Isotopic values of carbon and nitrogen were correlated in different tissues growing simultaneously for most species analyzed, suggesting that mathematical corrections could be used to compare different tissues. Our results imply that more care needs to be taken when comparing stable isotope signatures across studies assuming different tissues are equivalent indicators of trophic ecology

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:McGill, Dr Rona and Furness, Professor Robert
Authors: Quillfeldt, P., Bugoni, L., McGill, R.A.R., Masello, J. F., and Furness, R.W.
College/School:College of Medical Veterinary and Life Sciences > Institute of Biodiversity Animal Health and Comparative Medicine
Journal Name:Marine Biology
Publisher:Springer
ISSN:0025-3162
ISSN (Online):1432-1793
Published Online:12 September 2008

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
426091Dietary segregation of seabirds breeding at New Island, Falkland Islands, with main focus on thin-billed prions Pachyptila belcheriRobert FurnessNatural Environment Research Council (NERC)EK 82-08/05RI BIODIVERSITY ANIMAL HEALTH & COMPMED