Abstract
Velocities of reactions in tissues and the rates of application of power to the operation of vital machinery are in general increased by warmth and depressed by cold. So the cold-blooded organisms act only as rapidly as their temperature permits, at levels imposed by their surroundings. Some poikilotherms can adapt their essential metabolism to some extent to the climate in their geographical range, and some adjustments for optimal activity can suit them for operation in the changing temperatures of the seasons. These adjustments are limited, slow and inflexible in relation to the daily and seasonal fluctuations that are so marked in arctic climates. Freezing arrests productive metabolism in all organisms.
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Irving, L. (1972). Warm Temperature of Birds and Mammals. In: Arctic Life of Birds and Mammals. Zoophysiology and Ecology, vol 2. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-85655-6_7
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DOI: https://doi.org/10.1007/978-3-642-85655-6_7
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