Abstract
Abstract Renal function (including rates of glomerular filtration (GFR), tubular water reabsorption, and urine production) was studied in normally hydrated crested newts at different stages of their annual cycle. GFR, estimated as clearance of 3H-inulin, ranged from 54 μl/g.h during the terrestrial phase to 16 μl/g.h in the aquatic phase. Rates of urine flow paralleled those of GRF. These results are in close agreement with the circumannual values for skin osmotic permeability, indicating that differential kidney activity is the major mechanism for the disposal of excess water taken on osmotically. Rates of water reabsorption by the renal tubules were not correlated with season of the year or habitat, thus suggesting greater “flexibility” in this process during the annual cycle.
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