Data/hora: 09/06/2024 04:26:04

Provedor de dados: 	5	
País: 	France	
Título: 	Flexibility in metabolic rate and activity level determines individual variation in overwinter performance	
Autores: 	Auer, Sonya K.; Salin, Karine; Anderson, Graeme J.; Metcalfe, Neil B.	
Data: 	2016-11	
Ano: 	2016	
Palavras-chave: 	Activity rate; Intraspecific variation; Lipid stores; Metabolic rate; Phenotypic flexibility.	
Resumo: 	Energy stores are essential for the overwinter survival of many temperate and polar animals, but individuals within a species often differ in how quickly they deplete their reserves. These disparities in overwinter performance may be explained by differences in their physiological and behavioral flexibility in response to food scarcity. However, little is known about whether individuals exhibit correlated or independent changes in these traits, and how these phenotypic changes collectively affect their winter energy use. We examined individual flexibility in both standard metabolic rate and activity level in response to food scarcity and their combined consequences for depletion of lipid stores among overwintering brown trout (Salmo trutta). Metabolism and activity tended to decrease, yet individuals exhibited striking differences in their physiological and behavioral flexibility. The rate of lipid depletion was negatively related to decreases in both metabolic and activity rates, with the smallest lipid loss over the simulated winter period occurring in individuals that had the greatest reductions in metabolism and/or activity. However, changes in metabolism and activity were negatively correlated; those individuals that decreased their SMR to a greater extent tended to increase their activity rates, and vice versa, suggesting among-individual variation in strategies for coping with food scarcity.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	https://archimer.ifremer.fr/doc/00413/52498/53299.pdf

DOI:10.1007/s00442-016-3697-z

https://archimer.ifremer.fr/doc/00413/52498/	
Editor: 	Springer	
Formato: 	application/pdf	
Fonte: 	Oecologia (0029-8549) (Springer), 2016-11 , Vol. 182 , N. 3 , P. 703-712	
Fonte: 	The Author(s) 2016. This article is published with open access at Springerlink.com

info:eu-repo/semantics/openAccess

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