Abstract
The rate of water loss in air from three species of the fresh-water crab Potamon has been determined at various relative humidities and a constant temperature of 20° C. Water is lost, not only from the gill cavity but also through the integument. The rate of water loss decreases with desiccation. This decrease is probably due to decreasing permeability of the integument as desiccation progresses. Of the three species studied, P. sidneyi has the lowest rate of water loss. There is no significant different between the rate of water loss of P. depressus and P. warreni. Evidence is presented that this greater resistance of P. sidneyi to desiccation is not due to a difference in permeability of the integument. The survival time and the water loss at death have been determined for all three species. The lethal water loss is the same in all conditions of desiccation studied. P. sidneyi has a higher lethal water loss than the other two species. This, together with its lower rate of water loss, results in it havin...
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