FN Archimer Export Format
PT J
TI Aerobic capacities and swimming performance of polar cod (Boreogadus saida) under ocean acidification and warming conditions
BT 
AF KUNZ, Kristina Lore
   CLAIREAUX, Guy
   POERTNER, Hans-Otto
   KNUST, Rainer
   MARK, Felix Christopher
AS 1:1,2,3;2:4;3:2,3;4:1;5:2;
FF 1:;2:;3:;4:;5:;
C1 Alfred Wegener Inst, Helmholtz Ctr Polar & Marine Res, Bentho Pelag Proc, Alten Hafen 26, D-27568 Bremerhaven, Germany.
   Alfred Wegener Inst, Helmholtz Ctr Polar & Marine Res, Integrat Ecophysiol, Handelshafen 12, D-27570 Bremerhaven, Germany.
   Univ Bremen, Fachbereich 2,NW 2 Leobener Str, D-28359 Bremen, Germany.
   Univ Bretagne Occidentale, LEMAR UMR 6539, Unite PFOM, Lab ARN,Ctr Ifremer Brest, F-29280 Plouzane, France.
C2 INST A WEGENER, GERMANY
   INST A WEGENER, GERMANY
   UNIV BREMEN, GERMANY
   UBO, FRANCE
UM LEMAR
IF 3.017
TC 22
UR https://archimer.ifremer.fr/doc/00470/58121/60547.pdf
LA English
DT Article
DE ;Climate change;Gadids;Arctic cod;Hypercapnia;RCP8.5;Aerobic scope
AB Polar cod (Boreogadus saida) is an important prey species in the Arctic ecosystem, yet its habitat is changing rapidly: climate change, through rising seawater temperatures and CO2 concentrations, is projected to be most pronounced in Arctic waters. This study aimed to investigate the influence of ocean acidification and warming on maximum performance parameters of B. saida as indicators for the species' acclimation capacities under environmental conditions projected for the end of this century. After 4 months at four acclimation temperatures (0, 3, 6, 8 degrees C) each combined with two P-CO2 levels (390 and 1170 mu atm), aerobic capacities and swimming performance of B. saida were recorded following a U-crit protocol. At both CO2 levels, standard metabolic rate (SMR) was elevated at the highest acclimation temperature indicating thermal limitations. Maximum metabolic rate (MMR) increased continuously with temperature, suggesting an optimum temperature for aerobic scope for exercise (AS(ex)) at 6 degrees C. Aerobic swimming performance (U-gait) increased with acclimation temperature irrespective of CO2 levels, while critical swimming speed (U-crit) did not reveal any clear trend with temperature. Hypercapnia evoked an increase in MMR (and thereby AS(ex)). However, swimming performance (both U-gait and U-crit) was impaired under elevated nearfuture P-CO2 conditions, indicating reduced efficiencies of oxygen turnover. The contribution of anaerobic metabolism to swimming performance was very low overall, and further reduced under hypercapnia. Our results revealed high sensitivities of maximum performance parameters (MMR, U-gait, U-crit) of B. saida to ocean acidification. Impaired swimming capacity under ocean acidification may reflect reduced future competitive strength of B. saida. 
PY 2018
PD NOV
SO Journal Of Experimental Biology
SN 0022-0949
PU Company Biologists Ltd
VL 221
IS 21
UT 000449824800014
DI 10.1242/jeb.184473
ID 58121
ER

EF