Calcium Metabolism in Bullfrog Tadpoles (Rana Catesbeiana)

Author:

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

Affiliation:

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

Abstract

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.

Publisher

The Company of Biologists

Subject

Insect Science,Molecular Biology,Animal Science and Zoology,Aquatic Science,Physiology,Ecology, Evolution, Behavior and Systematics

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