Abstract
1. 1. Both Orconectes rusticus and O. virilis show a pronounced thermal acclimation response. Their heat resistance is in the upper portion of the range of literature values for crayfish and other crustaceans. 2. 2. The thermal acclimation time courses for the two species are somewhat similar. The smaller magnitude of the response for the Northern species ( O. virilis) stems from an increased heat resistance for cold acclimated animals rather than from a lowered heat resistance for 25°C acclimated crayfish. 3. 3. Two methods (CTM and LT 50) of measuring heat resistance in O. rusticus yield similar acclimation rates and time course patterns, but markedly different rates for reverse acclimation. 4. 4. Quantitative methods for acclimation time course analysis are described and applied both to the crayfish data and to derived literature values.
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