Abstract
The oxygen consumption of excised gill tissue from Hemigrapsus nudus was determined in crabs acclimated to two temperatures (5° and 20°C) and two different salinities (30 and 11%). The effects of acute shifts from one acclimation condition to another were also measured. An acute decrease in salinity (30 to 11%) or an acute increase in temperature (5° to 20°C) resulted in an increase in oxygen consumption. Increase in oxygen consumption resulting from an acute decrease in salinity appears to be (1) independent of the crabs' thermal history, and (2) linear, following a 20 min equilibration period. The significance of isolating acute osmotic responses from temperature control is discussed.
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