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Artículo

Food consumption estimates of southern elephant seal females during their post-breeding aquatic phase at King George Island

Carlini, A. R.; Daneri, Gustavo AdolfoIcon ; Márquez, María Elba Isabel; Bornemann, H.; Panarello, Hector OsvaldoIcon ; Casaux, R.; Ramdohr, S.; Plötz, J.
Fecha de publicación: 10/2005
Editorial: Springer Verlag Berlín
Revista: Polar Biology
ISSN: 0722-4060
e-ISSN: 1432-2056
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Química Analítica

Resumen

Changes in mass and body composition, measured with labelled water, were used to quantify the energy expenditure during lactation and energy replenishment during the post-breeding aquatic phase in Southern elephant seal females at Stranger Point, King George Island. During lactation females spent a mean of 6,021±1,365 MJ, which resulted in a loss of 35% of the initial mass, comprising 63% of initial body fat and 20% of initial body protein. During the 58±5.4 day post-breeding foraging period, females gained 135±39 Kg, which allowed them to recover an average of 55% of the mass, including 46% of the fat, 71% of the protein and 47% of the energy lost during lactation. Neither the mass nor the energy lost during lactation were related to those replenished while at sea. However, protein loss expressed in absolute terms or as a proportion of that present at the beginning of lactation explained about 50% of the variation in the protein gained during the post-breeding phase. This might indicate the presence of a mechanism favouring an increase in lean tissue during post-breeding. Daily energy requirements for an average sized female, during the post-breeding aquatic phase were estimated at 96 MJ. Estimation of prey consumption varies according to assumptions about diet composition. On a basis of 450 females, the total biomass of fish and squid consumed by the breeding group, assuming a diet composed of 75% cephalopods and 25% fish, was estimated to be 521 and 174 metric tonnes, respectively, for the period examined. © Springer-Verlag.
Palabras clave: Prey Item , Basal Metabolic Rate , Total Body Water , Lactation Period , Elephant Seal
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/147438
DOI: http://dx.doi.org/10.1007/s00300-005-0004-6
URL: https://link.springer.com/article/10.1007%2Fs00300-005-0004-6
Colecciones
Articulos(INGEIS) [203]
Articulos de INST.DE GEOCRONOLOGIA Y GEOLOGIA ISOTOPICA (I)
Articulos(MACNBR) [2343]
Articulos de MUSEO ARG.DE CS.NAT "BERNARDINO RIVADAVIA"
Articulos(SEDE CENTRAL) [31929]
Articulos de SEDE CENTRAL
Citación
Carlini, A. R.; Daneri, Gustavo Adolfo; Márquez, María Elba Isabel; Bornemann, H.; Panarello, Hector Osvaldo; et al.; Food consumption estimates of southern elephant seal females during their post-breeding aquatic phase at King George Island; Springer Verlag Berlín; Polar Biology; 28; 10; 10-2005; 769-775
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