Abstract

1. 1. Although variable, respiration is proportional to the 0·536 power of wet weight for Polinices duplicatus at all temperatures and seasons tested. 2. 2. Q 10 is inversely proportional to size between 15 and 30°C and directly porportional to size between 5 and 10°C. 3. 3. Level of metabolism is directly proportional to temperature. 4. 4. Crawling activity is 35 per cent less between 5 and 10°C than between 15 and 30°C. 5. 5. There is no evidence of seasonal acclimation of respiration in P. duplicatus. 6. 6. Possible adaptive significance and physiological mechanisms for patterns of respiration found, and the possibility of a metabolic “switch” are discussed.

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