Flexibility in metabolic rate and activity level determines individual variation in overwinter performance

13Citations
Citations of this article
43Readers
Mendeley users who have this article in their library.

Abstract

Energy stores are essential for the overwinter\r<br />survival of many temperate and polar animals, but individuals\r<br />within a species often differ in how quickly they deplete\r<br />their reserves. These disparities in overwinter performance\r<br />may be explained by differences in their physiological and\r<br />behavioral flexibility in response to food scarcity. However,\r<br />little is known about whether individuals exhibit correlated\r<br />or independent changes in these traits, and how these phenotypic\r<br />changes collectively affect their winter energy use.\r<br />We examined individual flexibility in both standard metabolic\r<br />rate and activity level in response to food scarcity and\r<br />their combined consequences for depletion of lipid stores\r<br />among overwintering brown trout (Salmo trutta). Metabolism\r<br />and activity tended to decrease, yet individuals exhibited\r<br />striking differences in their physiological and behavioral\r<br />flexibility. The rate of lipid depletion was negatively\r<br />related to decreases in both metabolic and activity rates,\r<br />with the smallest lipid loss over the simulated winter period\r<br />occurring in individuals that had the greatest reductions in\r<br />metabolism and/or activity. However, changes in metabolism\r<br />and activity were negatively correlated; those individuals\r<br />that decreased their SMR to a greater extent tended\r<br />to increase their activity rates, and vice versa, suggesting\r<br />among-individual variation in strategies for coping with\r<br />food scarcity.

Cite

CITATION STYLE

APA

Auer, S. K., Salin, K., Anderson, G. J., & Metcalfe, N. B. (2016). Flexibility in metabolic rate and activity level determines individual variation in overwinter performance. Oecologia, 182(3), 703–712. https://doi.org/10.1007/s00442-016-3697-z

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free