Water and energy economy of an omnivorous bird: Population differences in the Rufous-collared Sparrow (Zonotrichia capensis)

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

Abstract

We investigated the intraspecific variation in basal metabolic rate (BMR) and total evaporative water loss (TEWL) in the omnivorous passerine Zonotrichia capensis from two populations inhabiting regions with different precipitation regimes and aridity indices. Values of TEWL in birds from the semi-arid region were significantly lower than those found in sparrows from the mesic region. TEWL in birds from the semi-arid site was 74% of the expectation based on body mass for passerines from mesic areas and similar to the allometric expectation for passerines from arid environments. In sparrows from the mesic area, TEWL was higher than predicted by their body mass for passerines from arid environments (133%), but very close (97%) to the expectation for passerines from mesic areas. BMR values were 25% lower in sparrows from the semi-arid region. The lower TEWL and BMR of birds from the semi-arid region may be a physiological adjustment that allows them to cope with fewer resources and/or water. We propose that the lower endogenous heat production in birds from the semi-arid environment may decrease their water requirements. © 2006 Elsevier Inc. All rights reserved.

Más información

Título según WOS: Water and energy economy of an omnivorous bird: Population differences in the Rufous-collared Sparrow (Zonotrichia capensis)
Título según SCOPUS: Water and energy economy of an omnivorous bird: Population differences in the Rufous-collared Sparrow (Zonotrichia capensis)
Título de la Revista: COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY
Volumen: 144
Asunto: 4
Editorial: Elsevier Science Inc.
Fecha de publicación: 2006-01-01
Página de inicio: 485
Página final: 490
Idioma: English
DOI/URL:

10.1016/j.cbpa.2006.04.016

Identificador: 10.1016/j.cbpa.2006.04.016
Notas: ISI, SCOPUS