Intraspecific basal metabolic rate varies with trophic level in rufous-collared sparrows

Sabat P.; Cavieres, G; Veloso C.; Canals M.; Bozinovic F.

Abstract

One of the most controversial hypotheses that associate basal metabolic rate (BMR) with food habits and habitat productivity is the food habit hypothesis (FHH). Here we examined the relationship between BMR, diet, and climate among populations of the omnivorous passerine, Zonotrichia capensis (Emberizidae). We used nitrogen stable isotopes to estimate each individual's relative trophic level. To tease apart the effect of climatic variables and diet on BMR, we also used structural equation modeling. After the effect of body mass and climatic variables was taken into account, a significant effect of trophic level as estimated by d 15N on BMR was found. Our result seems to support the FHH at the intraspecific level, i.e., birds from the lower trophic levels - feeding on seeds and bud - had higher BMR than individuals from higher trophic levels. © 2009 Elsevier Inc. All rights reserved.

Más información

Título según WOS: Intraspecific basal metabolic rate varies with trophic level in rufous-collared sparrows
Título según SCOPUS: Intraspecific basal metabolic rate varies with trophic level in rufous-collared sparrows
Título de la Revista: COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY
Volumen: 154
Asunto: 4
Editorial: Elsevier Science Inc.
Fecha de publicación: 2009-01-01
Página de inicio: 502
Página final: 507
Idioma: English
DOI/URL:

10.1016/j.cbpa.2009.08.009

Identificador: 10.1016/j.cbpa.2009.08.009
Notas: ISI, SCOPUS