FN Archimer Export Format
PT J
TI Inadequate food intake at high temperatures is related to depressed mitochondrial respiratory capacity
BT 
AF SALIN, Karine
   AUER, Sonya K.
   ANDERSON, Graeme J.
   SELMAN, Colin
   METCALFE, Neil B.
AS 1:1;2:1;3:1;4:1;5:1;
FF 1:;2:;3:;4:;5:;
C1 Univ Glasgow, Inst Biodivers Anim Hlth & Comparat Med, Graham Kerr Bldg, Glasgow G12 8QQ, Lanark, Scotland.
C2 UNIV GLASGOW, UK
IF 3.32
TC 37
UR https://archimer.ifremer.fr/doc/00414/52501/53310.pdf
LA English
DT Article
DE ;Ecophysiology;Food intake;Global warming;Proton leak;Respiratory control ratio;Respiration rate
AB Animals, especially ectotherms, are highly sensitive to the temperature of their surrounding environment. Extremely high temperature, for example, induces a decline of average performance of conspecifics within a population, but individual heterogeneity in the ability to cope with elevating temperatures has rarely been studied. Here, we examined inter-individual variation in feeding ability and consequent growth rate of juvenile brown trout Salmo trutta acclimated to a high temperature (19 degrees C), and investigated the relationship between these metrics of whole-animal performances and among-individual variation in mitochondrial respiration capacity. Food was provided ad libitum, yet intake varied ten-fold amongst individuals, resulting in some fish losing weight whilst others continued to grow. Almost half of the variation in food intake was related to variability in mitochondrial capacity: low intake (and hence growth failure) was associated with high leak respiration rates within liver and muscle mitochondria, and a lower coupling of muscle mitochondria. These observations, combined with the inability of fish with low food consumption to increase their intake despite ad libitum food levels, suggest a possible insufficient capacity of the mitochondria for maintaining ATP homeostasis. Individual variation in thermal performance is likely to confer variation in the upper limit of an organism's thermal niche and might affect the structure of wild populations in warming environments.
PY 2016
PD MAY
SO Journal Of Experimental Biology
SN 0022-0949
PU Company Of Biologists Ltd
VL 219
IS 9
UT 000376118300020
BP 1356
EP 1362
DI 10.1242/jeb.133025
ID 52501
ER

EF