Abstract
Adult Rana sphenocephala from hypersaline environments in Florida are more tolerant of dilute sea water than are individuals of the same species from hyposaline environments. This increased tolerance to brackish water appears to be a result of a decrease in the rate of water loss for frogs from hypersaline environments. The decrease in the rate of water loss appears to be a result of a more concentrated plasma, which has the effect of reducing the osmotic gradient between the frog and its environment, and an increased body size, which has the dual effect of reducing the surface area relative to the internal volume of water and increasing skin thickness, probably reducing permeability. A decreased rate of water loss appears to be adaptive for frogs living in the constantly fluctuating salinity typical of a Florida salt marsh.
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