Abstract
1. 1. Oxygen consumption of gill tissue from Crassostrea virginica, Mercenaria mercenaria, Modiolis demissus and Mytilus edulis was measured at salinities of 5, 10, 15, 20, 25 and 30 ppt and at temperatures of 10, 18 and 26°C during winter and summer. 2. 2. The seasonal differences were variable, i.e. winter values greater than, the same as and less than the corresponding summer values were observed. 3. 3. Oxygen consumption was greater at higher temperatures. Summer as compared to winter Q 10 values tended to be higher from 10–18°C and lower from 18–26°C. 4. 4. Season and experimental temperature modified only slightly the effects of experimental salinity. 5. 5. Oxygen consumption was relatively constant from 5–30 ppt for Crassostrea and Mytilus, but was greater at low salinities for Mercenaria and Modiolus. The effect of salinity on oxygen consumption of isolated gill does not appear to be correlated with the lower salinity boundaries of the whole animals.
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