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Marine Ecology Progress Series

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MEPS 689:169-177 (2022)  -  DOI:

Foraging trips and isotopic niche of chick-rearing South Georgian diving petrels from the Kerguelen Islands

C. A. Bost1,*, K. Delord1, Y. Cherel1, C. M. Miskelly2, A. Carravieri1, P. Bustamante3,4, J. P. Y. Arnould5, A. Fromant1,5

1Centre d’Études Biologiques de Chizé, UMR 7372 du CNRS-La Rochelle Université, 405 route de Prissé-la-Charrière, 79360 Villiers-en-Bois, France
2Museum of New Zealand Te Papa Tongarewa, PO Box 467, Wellington 6140, New Zealand
3Littoral Environnement et Sociétés (LIENSs), UMR 7266 CNRS - La Rochelle Université, 2 rue Olympe de Gouges, 17000 La Rochelle, France
4Institut Universitaire de France (IUF), 1 rue Descartes, 75005 Paris, France
5School of Life and Environmental Sciences, Deakin University, 221 Burwood Hwy, Burwood, VIC 3125, Australia
*Corresponding author:

ABSTRACT: Seabirds are central place foragers, relying on prey that is patchily distributed and of variable predictability. Species travelling at a high energetic cost are more strongly dependent on spatially predictable prey. This is the case for diving petrels Pelecanoides spp., which are small Procellariiformes that feed by pursuit diving and travel by flapping constantly. Despite their abundance and importance as zooplankton consumers, information on the foraging strategy of diving petrels is still lacking. The detailed at-sea movements and the trophic niche of the South Georgian diving petrel P. georgicus was investigated for the first time using miniaturized GPS and the stable isotope method, respectively. Overall, South Georgian diving petrels from the Kerguelen Islands performed unexpected, direct and long-distance trips (mean foraging range: 191-217 km) to the Antarctic Polar Front, south of the archipelago. This foraging ground is a productive and predictable area, where the birds stopped and fed at the distal part of their trip. Blood isotopic values indicate that the tracked birds fed consistently on macrozooplankton. Such a distant oceanic feeding strategy contrasts with the coastal foraging patterns of the closely related common diving petrel P. urinatrix. Commuting to a more distant but easily accessible resource allows South Georgian diving petrels to cope with their high commuting costs, and to segregate spatially from the sympatric common diving petrel during the breeding season.

KEY WORDS: At-sea distribution · Trophic niche · Procellariiformes · Pelecanoides georgicus · Southern Ocean

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Cite this article as: Bost CA, Delord K, Cherel Y, Miskelly CM and others (2022) Foraging trips and isotopic niche of chick-rearing South Georgian diving petrels from the Kerguelen Islands. Mar Ecol Prog Ser 689:169-177.

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