变态对虎纹钝口螈皮肤水渗透性的影响。

Effects of metamorphosis on water permeability of skin in the salamander, Ambystoma tigrinum.

作者信息

Galey W R, Wood S C, Mancha V M

出版信息

Comp Biochem Physiol A Comp Physiol. 1987;86(3):429-32. doi: 10.1016/0300-9629(87)90519-6.

Abstract

Developmentally associated changes in the pressure driven water permeability of the skin of the salamander Ambystoma tigrinum were measured at 20 degrees C in neotenic (gilled), transitional, and fully transformed adults. Mean values for the hydraulic conductivity of the skin (Lp, X 10(-5) cm.sec-1.ATM-1) were, respectively, 1.54, 0.54 and 0.13. This nearly 12-fold decrease in the H2O permeability coincides with the transition from aquatic to terrestrial life and may be related to the changing role of the skin in water conservation. The increase in hydraulic conductivity is opposite to the decrease in H2O diffusion rates reported by others. We suggest a theoretical basis for the apparently conflicting results.

摘要

在20摄氏度下，对虎纹钝口螈（Ambystoma tigrinum）幼态持续（有鳃）、过渡型和完全变态的成年个体的皮肤压力驱动水渗透性的发育相关变化进行了测量。皮肤水力传导率（Lp，×10⁻⁵厘米·秒⁻¹·大气压⁻¹）的平均值分别为1.54、0.54和0.13。水渗透性近12倍的下降与从水生到陆生生活的转变相吻合，可能与皮肤在保水方面作用的变化有关。水力传导率的增加与其他人报道的水扩散速率的下降相反。我们为这些明显相互矛盾的结果提出了一个理论基础。