タゴガエルRana tagoiの生殖腺の性分化過程とその発育環境による差異

概要

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Using eggs and froglets of Rana tagoi collected at Mt. Yahiko, first-year gonadal development was studied histologically. In the larvae reared at room temperature, the testes developed directly from sexually indifferent structures. Furthermore, often in these testes of reared froglets, germ cells were scarse or completely absent. In the natural habitat, on the other hand, the gonads of the froglet of genetic male developed first into ovarian structures, which later transformed into testes in froglets of 80-100 days old. The cause of these differences may be attributed to the difference in temperature, which is considerably lower in their habitat than in the laboratory. It is conceivable that in the larvae and froglets of this species the germ cells are able to develop normally only under such low environmental temperature.
1971-07-01