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Journal of Experimental Biology 88,357-366 (1980)
Published by Company of Biologists 1980

Calcium Metabolism in Bullfrog Tadpoles (Rana Catesbeiana)

GERALDINE F. BALDWIN ¹ and P. J. BENTLEY ¹

¹ Departments of Pharmacology and Ophthalomology, Mount Sinai School of Medicine, of The City University of New York, New York, U.S.A. 10029

Non-feeding bullfrog (Rana catesbeiana) tadpoles can maintain their body Ca concentration in artificial pond waters containing a range of Ca concentrations. The rate of uptake of ⁴⁵Ca increases when the tadpoles are preadapted to a low-Ca pond water and declines when they are pre-adapted to high Ca. Measurement of drinking rate shows that drinking could account for only 5% of the influx. From in vitro experiments, it is estimated that about 70% of the influx occurs accoss the gills, and about 25% through the skin. Calcitonin decreases accumulation of ⁴⁵Ca while 1,25-(OH)₂ vitamin D₃ increases it; parathyroid hormone was without effect. Efflux of ⁴⁵Ca was unchanged by calcitonin or parathyroid hormone.

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