To access the full text documents, please follow this link: http://hdl.handle.net/2445/32385

Changes in the foraging strategy of female South American sea lions (Carnivora: Pinnipedia) after parturition.
Drago, Massimiliano; Cardona Pascual, Luis; Crespo, Enrique Alberto; García, Néstor; Ameghino, Santiago; Aguilar, Àlex
Universitat de Barcelona
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.
2012-10-24
Lleons marins
Alimentació animal
Patagònia (Argentina i Xile)
Sea lions
Animal feeding
Patagonia (Argentina and Chile)
cc-by-nc (c) Consejo Superior de Investigaciones Científicas (CSIC), 2010
http://creativecommons.org/licenses/by-nc/3.0/es
Article
Article - Published version
Consejo Superior de Investigaciones Científicas (CSIC)
         

Show full item record

Related documents

Other documents of the same author

Gómez-Campos, Encarna; Borrell Thió, Assumpció; Cardona Pascual, Luis; Forcada i Nogués, Jaume; Aguilar, Àlex
Revellés Conde, Mónica; Cardona Pascual, Luis; Aguilar, Àlex; Borrell Thió, Assumpció; Fernández, Gloria; San Félix, Manu
Aguilar, Àlex; Giménez, J.; Goméz Campos, Encarna; Cardona Pascual, Luis; Borrell Thió, Assumpció
Aguilar, Àlex; Giménez, J.; Goméz Campos, Encarna; Cardona Pascual, Luis; Borrell Thió, Assumpció
 

Coordination

 

Supporters