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Marine Ecology Progress Series

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MEPS 490:255-266 (2013)  -  DOI:

Stable isotopes document inter- and intra-specific variation in feeding ecology of nine large southern Procellariiformes

Audrey Jaeger1,2,*, Sébastien Jaquemet2,3, Richard A. Phillips4, Ross M. Wanless5,6, Pierre Richard7, Yves Cherel1

1Centre d’Etudes Biologiques de Chizé, UPR 1934 du CNRS, 79360 Villiers-en-Bois, France
2Laboratoire ECOMAR, Université de La Réunion, 15 Avenue René Cassin, BP 7151, 97715 Saint-Denis Cedex, Ile de La Réunion, France
3Southern Ocean Group, Zoology and Entomology Department, Rhodes University, Grahamstown 6140, South Africa
4British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
5Percy FitzPatrick Institute, DST/NRF Centre of Excellence, University of Cape Town, Rondebosch 7701, South Africa
6Seabird Division, BirdLife South Africa, PO Box 7119, Roggebaai 8012, South Africa
7Laboratoire Littoral, Environnement et Sociétés, UMR 6250 du CNRS-Université de La Rochelle, 2 rue Olympe de Gouges,
17000 La Rochelle, France

ABSTRACT: Investigating the foraging ecology of seabirds is especially challenging given their wide-ranging movements and the practical difficulties of obtaining unbiased information on their feeding behavior. Despite the development of animal-borne tracking devices, several limitations preclude investigations at the scale of a whole community in a given season or year, and, until recently, during the non-breeding period. Here we analyzed δ13C and δ15N in feathers of chicks and adults to investigate inter- and intra-specific variation in the foraging habitat and trophic position of 9 large procellariiform seabirds from 6 southern breeding localities during the breeding and non-breeding periods. Isotopic ratios of each species were generally consistent among different breeding populations, despite the large geographical scale and potential variation in oceanography in surrounding waters. Both spatial and trophic segregation apparently allowed the co-existence of sympatric species in most breeding localities, except at South Georgia, where both δ13C and δ15N in chicks showed high overlap among species, probably resulting from the superabundance of alternative food resources during the summer. Low variance in stable isotope ratios among adults in several species indicated high overlap between individuals in feeding habits and trophic levels (i.e. isotopic specialist populations) during the non-breeding period. By contrast, large isotopic variances and the high within- and between-individual components of the trophic niche width suggested that grey-headed and light-mantled sooty albatrosses are generalists. Based on δ13C, the species that breed in the Southern Ocean can be categorized as residents or subtropical migrants, with the latter including oceanic and neritic subtropical migrants. Albatrosses meet the high energetic challenge of feather synthesis by foraging in different habitats, depending on the length of the non-breeding period. Annual breeders renew their plumage in productive neritic waters in ~4 mo, whereas biennially breeding species moult in less productive oceanic waters over much longer periods (~12 to 16 mo).

KEY WORDS: Albatross · Generalism · Migration · Seabird · Trophic segregation

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Cite this article as: Jaeger A, Jaquemet S, Phillips RA, Wanless RM, Richard P, Cherel Y (2013) Stable isotopes document inter- and intra-specific variation in feeding ecology of nine large southern Procellariiformes. Mar Ecol Prog Ser 490:255-266.

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