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Bibliography of the Maurice Lamontagne Institute

Dounia DAOUD

DAOUD, D, Y. LAMBERT, C. AUDET, D. CHABOT, 2010. Size and temperature-dependent variations in intermolt duration and size increment at molt of Northern Shrimp, Pandalus borealis. Mar. Biol., 157: 2655-2666 .

Growth of Pandalus borealis post-larval stages was measured in relation to size and temperature. Growth characteristics, including intermolt period (IP), molt increment (MI) in size and mass, and tissue allocation in juvenile, male, and female shrimp, were evaluated at 2, 5, and 8 °C, the temperature range where this species is generally found in the Northwest Atlantic. Significant variations in growth were associated with temperature and shrimp size. IP (days) increased significantly with shrimp size and was inversely related to temperature. Size (cephalothorax length in mm) and temperature effects were best described by IP = 10(0.67 log(CL) – 0.06 T – 1.34). The pronounced effect of temperature on IP while MIS changed little indicated that the main influence of temperature on growth rate of P. borealis was through IP. Specific growth rate (SGRS) decreased rapidly with size to near zero values in females. Overall, juveniles were much more sensitive to temperature variations than adults, suggesting that temperatures encountered during the juvenile stage will largely influence the growth trajectory of the population.©2010 Springer

DAOUD, D., D. CHABOT, C. AUDET, Y. LAMBERT, 2007. Temperature induced variation in oxygen consumption of juvenile and adult stages of the northern shrimp, Pandalus borealis. J. Exp. Mar. Biol. Ecol., 347(1-2): 30-40 .

The impact of temperature on oxygen consumption (MO2) 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 MO2 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 (SMRind). SMRind 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 (Ww) and temperature (T) on SMRind were described by: SMRind = 10(0.57 log (Ww)+0.04 T-1.21), with SMRind expressed in mg O2 h-1, Ww in g and T in °C. This model explained 92 % of the variability in SMRind. Mass-specific MO2 adjusted for a 5 g shrimp (SMR5g) was not influenced by developmental stage indicating that the regression model for SMRind 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 (Q10) were in the normal range found for crustaceans, Q10 values varying from 1.73 to 4.97. &2007 Elsevier B.V.