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Costs of reproduction a study on metabolic requirements of the gonads and fecundity of the bivalve dreissena polymorpha



Costs of reproduction a study on metabolic requirements of the gonads and fecundity of the bivalve dreissena polymorpha



Malacologia 33(1-2): 63-70



In two sets of experiments, fecundity of the freshwater mussel Dreissena polymorpha and the metabolic requirements of mature eggs within the animal have been estimated. Female Dreissena polymorpha can spawn more than 106 eggs, and the males up to nearly 1010 sperms depending on size. Both release about the same gamete weight, which contributes in many cases more than 30% of the body weight prior to spawning. Oxygen consumption and ammonia excretion rates of individual females were estimated at 10.degree.C and 15.degree.C before and after spawning; data indicate a lower weight-specific respiration rate of the stored gametes compared with that of the whole animal; it was independent of temperature in this range. Teh eggs contribute to only a small and insignificant proportion of the total ammonia excretion rate. Respiration and excretion rate of the whole animal, in contrast, were highly dependent on temperature.

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