Abstract

1.1. Groups of the mud crab Hemigrapsus oregonensis which had been exposed for prolonged periods to high salinity demonstrated better osmotic regulation in concentrated sea water than groups freshly removed from approximately normal sea water.2.2. This phenomenon is attributed to physiological acclimation.3.3. Acclimation occurred in groups exposed either suddenly or gradually to high salinities.4.4. Detectable acclimation to high salinity required more than 5 days' exposure but strong acclimation was established after 22 days' immersion in concentrated sea water.5.5. Contrary to previous findings Hemigrapsus can osmoregulate in concentrated sea water even without a prolonged period of acclimation. However, this hyporegulatory process is labile and can be obliterated by improper maintenance in the laboratory or handling while collecting.6.6. Evidence that acclimation occurs in the field is presented.

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