Abstract
Injection of 10 −5 M dopamine into adult green crabs increased the concentration of cyclic AMP (cAMP) in all gills tested. Short-term acclimation (24 hr) of crabs to 40% seawater (sw) also increased the cAMP content of the posterior gills as compared to controls, an effect similar to that seen with injection of dopamine. However, when crabs were acclimated to reduced salinity for 2 weeks, the concentration of cAMP in the gills was not statistically different from that of gills from crabs in 100% sw. It is likely that the physiological effects of dopamine on gills are important in the early stages of acclimation and that they depend upon an increase in concentration of cAMP, which interacts with cellular proteins.
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