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This may result in elevated a values in excretion-weight curves during the season of maximum gametogenic activity. C. Temperature At high temperatures ammonia excretion rates may increase markedly (Ansell and Sivadas, 1973; Bayne and Scullard, 1977a; Widdows, 1978a; Jordan and Valiela, 1982), presumably because protein catabolism is in­ creased to meet elevated metabolic energy demands. 08 for Donax vittatus during acute temperature changes in the range 10-20°C. Acclimated animals, however, showed no significant difference in ammonia excretion rate over the same temperature range.

In contrast, starvation during the autumn months, when glycogen reserves are high, actually reduces the rate of ammonia excretion and elevates the O : N ratio, indicating a heavier reliance on glycogen reserves to meet meta­ bolic requirements. Additional fluctuations in the a values of the equations given in Table IV J F M A M J J A S O N Month Fig. 12. Seasonal variations in the rates of ammonia (NH 4 -N) excretion by Mytilus edulis of different dry flesh weights. ) 1. Bivalvia 47 may stem from differing metabolic priorities in reproductive and juvenile mussels.

1981) and provides an exciting new tool for the investigation of respiratory processes under reduced oxygen tension. B. Effects of Body Size Relationships between body size (usually given as dry flesh weight, but sometimes as shell length) and metabolic rate (in units of either oxygen consumption or energy) are normally given in the form of the allometric equation Y = a-Xb, where Y = metabolic rate and X = individual size or weight. The intercept (a) is a measure of the metabolic rate of an individual of unit weight (or length).

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