Abstract
The fresh-water field crabs Paratelphusa hydrodromous were acclimated to different concentrations of artificial sea water. In vitro polysaccharide synthesis of muscles in medium enriched by insulin or eyestalk extracts was studied at different temperatures. In crabs adapted to increased salinities, the polysaccharide content is higher in the extensor than in the flexor muscle. Adaptation to high salinities reduces the muscle polysaccharide content. In vitro polysaccharide synthesis is greater in the extensor muscle; the rate of synthesis decreases as the adaptation salinity is increased. The hemolymph sugar level does not vary with salinity. Eyestalk extract accelerates the synthesis rate in muscles more than does insulin. These changes are discussed with reference to potential mechanisms underlying non-genetic adaptation.
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