スジシマドジョウの地方種族における温度適応
スポンサーリンク
概要
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1. Differences in high temperature torelance and growth among five races of the striated spinous loach, Cobitis taenia striata are described. These fishes were reared at 20°, 25°, 30°, 33°, 34°, 35° and 36℃ during developmental stages. 2. The five races differ from each other in high temperature torelance, as in the following order : Large race<Middle race<Biwa-small race<Spotted-small race≒Small race. 3. The five races differ from each other in total length of young fishes, reared at the same temperature, as in the following order : Small race≒Spotted-small race<Biwa-small race<Middle race<Large race. This order is completely parallel with that in body length of adult fishes or in egg diameter, and reverse to that in high temperature torelance. 4. In the same race, the total lengths of young fishes vary with differences in temperature. They become larger at lower temperature and smaller at higher temperature. This phenomenon is considered as an expression of physiological responses of individuals to thermal conditions.
- 1954-07-31