By T. J. Pandian
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Additional resources for Bivalvia Through Reptilia
8, even during maximum aerobic respiration. As the oxygen in the vessels was utilized, oxygen con sumption subsequently fell to zero and the rate of heat production declined to between about 24 and 40% of the aerobic rate under complete anoxia. A similar study by Famme et a\. (1981) clearly shows how both total heat production and the proportion of aerobic to anaerobic respiration in Mytilus edulis vary with declining oxygen tension. A typical data set for a 12-mm mussel is shown in Fig. 1 1 .
Because starved individuals lost weight at the same rate as those fed silt alone, the former appears to be the only viable explanation. 1. Bivalvia 25 F. Feeding Periodicity There is evidence to suggest that absorbed ration is a function not only of the nature and amount of food but also of its temporal availability, in partic ular whether ingestion is continuous or intermittent. The effects of providing equal rations under continuous and discontinuous feeding regimes on the growth of Mytilus edulis and Crassostrea gigas have been investigated by Winter (1976) and Langton and McKay (1974, 1976), respectively.
Changes in temperature usu ally induce concomitant short-term or acute adjustments in metabolic rate, but if the temperature change persists over days or weeks a gradual adjust ment or acclimation may take place that restores the metabolic rate to a level comparable to that preceding the change. Acclimation often occurs in response to seasonal temperature cycles and may be evident in the similar respiration rates of latitudinally separated populations of individual species (Spärck, 1936). The degree by which metabolic rates change in response to temperature is often expressed in terms of temperature coefficients or Q 1 0 values.