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Title: Changes in the foraging strategy of female South American sea lions (Carnivora: Pinnipedia) after parturition.
Author: Drago, Massimiliano
Cardona Pascual, Luis
Crespo, Enrique A.
García, Néstor
Ameghino, Santiago
Aguilar, Àlex
Keywords: Lleons marins
Alimentació animal
Patagònia (Argentina i Xile)
Sea lions
Animal feeding
Patagonia (Argentina and Chile)
Issue Date: Sep-2010
Publisher: Consejo Superior de Investigaciones Científicas (CSIC)
Abstract: This study tests the hypothesis that female South American sea lions shift from off-shore, pelagic prey to coastal, benthic prey after parturition in order to reduce the foraging trip duration and hence the time pups remain unattended on the beach during early lactation. The δ13C and δ15N values of the serum and blood cells of 26 South American sea lion suckling pups from northern Patagonia were used to track the dietary changes of their mothers from late pregnancy to early lactation, after correction for differential isotopic fractionation between tissues. Primary producers and potential prey species were also analysed to establish a baseline for interpreting the stable isotope concentration of serum and blood cells. Isotopic ratios revealed a generalized increase in the consumption of coastal-benthic prey after parturition. Such a generalized post-partum shift will allow females to spend more time on land and look after their pups. The effects of this foraging strategy on the nutritional quality of the female"s diet are discussed.
Note: Reproducció del document publicat a:
It is part of: Scientia Marina, 2010, vol. 74, núm. 3, p. 589-598
Related resource:
ISSN: 0214-8358
Appears in Collections:Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)

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