Abstract
Juvenile Mytilus edulis were grown individually in plastic racks in a tidal salt marsh for 72 d in 1984, starved in the laboratory for 130 d, and then fed the alga Isochrysis galbana daily for 64 d. Oxygen consumption was measured at various times during the course of starvation and recovery. The effects of both size (tissue dry weight) and condition (tissue size relative to shell size) on the rate of oxygen consumption during the course of starvation and recovery were analyzed by multiple regression. Weight-specific preprandial rate was inversely correlated with both size and condition. Weight-specific active rate (measured shortly after feeding) was correlated with size but not condition. Relative Scope for Activity was inversely correlated with size and positively correlated with condition. Relative Specific Dynamic Action (RSDA; the integrated physiological and mechanical response to a meal) was initially correlated negatively with size and subsequently positively with condition. Glycogen content was shown to be positively correlated with condition in mussels before starvation and during recovery. During recovery, experimental mussels returned to 90% of their estimated dry weight prior to starvation, and from 53% after starvation. At weekly intervals during recovery, oxygen consumption was measured following a meal until it returned to the preprandial rate. Both pre- and postprandial volumes (μl at STP) of oxygen consumed per hour (\(\dot V\)O 2pre and \(\dot V\)O 2post , respectively) increased significantly during recovery. The postprandial rise in oxygen consumption increased significantly from 15% to 23% of \(\dot V\)O 2pre . At the end of the recovery period, RSDA [(\(\dot V\)O 2post −\(\dot V\)O 2pre )/\(\dot V\)O 2pre ] was independent of final dry weight, but was significantly correlated with percent dry weight recovered (r 2=0.44; df=10; P<0.02). The increase in RSDA may reflect increased utilization of food and its conversion to soma during recovery from starvation, as distinct from mechanical energy expenditure (feeding activity) following a meal.
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Communicated by J. M. Shick, Orono
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Gaffney, P.M., Diehl, W.J. Growth, condition and specific dynamic action in the mussel Mytilus edulis recovering from starvation. Marine Biology 93, 401–409 (1986). https://doi.org/10.1007/BF00401108
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DOI: https://doi.org/10.1007/BF00401108