FN Archimer Export Format
PT J
TI Flexibility in metabolic rate and activity level determines individual variation in overwinter performance
BT 
AF AUER, Sonya K.
   SALIN, Karine
   ANDERSON, Graeme J.
   METCALFE, Neil B.
AS 1:1;2:1;3:1;4:1;
FF 1:;2:;3:;4:;
C1 Univ Glasgow, Inst Biodivers Anim Hlth & Comparat Med, Graham Kerr Bldg, Glasgow G12 8QQ, Lanark, Scotland.
C2 UNIV GLASGOW, UK
IF 3.13
TC 36
UR https://archimer.ifremer.fr/doc/00413/52498/53299.pdf
LA English
DT Article
DE ;Activity rate;Intraspecific variation;Lipid stores;Metabolic rate;Phenotypic flexibility
AB 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. 
PY 2016
PD NOV
SO Oecologia
SN 0029-8549
PU Springer
VL 182
IS 3
UT 000385675100007
BP 703
EP 712
DI 10.1007/s00442-016-3697-z
ID 52498
ER

EF