Metabolic enzymes in seasonally acclimatized and cold acclimated rufous-collared sparrow inhabiting a Chilean Mediterranean environment
Author
dc.contributor.author
Peña Villalobos, Isaac
Author
dc.contributor.author
Núñez Villegas, Mónica
Author
dc.contributor.author
Bozinovic, Francisco
Author
dc.contributor.author
Sabat Opazo, Pablo
Admission date
dc.date.accessioned
2018-12-20T14:14:19Z
Available date
dc.date.available
2018-12-20T14:14:19Z
Publication date
dc.date.issued
2014
Cita de ítem
dc.identifier.citation
Current Zoology, Volumen 60, Issue 3, 2018, Pages 338-350
Identifier
dc.identifier.issn
16745507
Identifier
dc.identifier.other
10.1093/czoolo/60.3.338
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/155098
Abstract
dc.description.abstract
Due to the higher energy requirements of birds during winter, it is predicted that the activities of metabolic enzymes (e.g., citrate synthase, CS and cytochrome C oxidase, COX) should increase in tandem with increases in rates of energy expenditure (e.g., basal metabolic rate, BMR). However, there is mixed support for the hypothesis of enzymatic acclimatization. Furthermore, there is little information about the effect of ambient temperature on energetics and tissue enzyme activity levels in passerines inhabiting seasonal Mediterranean environments. In this study we evaluated the interplay between BMR and enzyme activities of freshly caught individuals of the passerine Zonotrichia capensis in winter and summer in a Mediterranean environment from central Chile, and also in warm (30 °C) and cold (15 °C) lab-acclimated birds. The results revealed a lack of seasonal variation in BMR, thermal conductance and in the activity of CS and COX. However, we found higher BMR and lower thermal cond