Temperature induced variation in oxygen consumption of juvenile and adult stages of the northern shrimp, Pandalus borealis

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Abstract The impact of temperature on oxygen consumption (MO 2 ) of Pandalus borealis was measured in the laboratory for juvenile, male and female shrimp at 2, 5 and 8 °C, the temperature range where P. borealis is generally found in the Northwest Atlantic. Measurements of MO 2 were taken every 60 min over 7–10 days on 0.22 to 13.80 g shrimp. These long-term measurement periods insured acclimation to the respirometers and allowed calculation of standard metabolic rate of individuals (SMR ind ). SMR ind was linearly related to body mass (log transformed data) and the mass-exponent for the species was 0.56. The effects of wet body mass ( W w ) and temperature ( T ) on SMR ind were described by: SMR ind = 10 (0.57 log ( W w )+0.04 T −1.21) , with SMR ind expressed in mg O 2 h − 1 , W w in g and T in °C. This model explained 92% of the variability in SMR ind . Mass-specific MO 2 adjusted for a 5 g shrimp (SMR 5g ) was not influenced by developmental stage indicating that the regression model for SMR ind was valid regardless of variations in size at maturity and sex transition. Routine and active metabolic rates followed the same variation pattern in relation to temperature and developmental stage than SMR. Finally, thermal coefficients ( Q 10 ) were in the normal range found for crustaceans, Q 10 values varying from 1.73 to 4.97.