Abe A S, Garcia L S
Departamento de Zoologia, Instituto de Biociências-UNESP, Rio Claro, Brasil.
Rev Bras Biol. 1990 Feb;50(1):243-7.
The frog, L. fuscus, becomes dormant during the dry season in southeastern Brazil. Plasma and urine were obtained and analyzed for K+, Na+, and osmotic concentrations in active and estivating frogs. Soil water potential from the estivation sites was compared with the osmotic concentrations of the frog. Plasma and urine osmotic concentrations (286.2 +/- 13.8 and 242.3 +/- 17.2 mOsm1(-1), respectively) were higher in the estivating than in active frogs (240.3 +/- 12.8 and 112.7 +/- 15.6 mOsm1(-1); plasma and urine), and the same holds true for plasma K+ content. The Na+ concentration was the same for active and estivating frogs. Soil water potential corresponded to osmotic pressure of 110 mOsm1(-1), showing that L. fuscus may uptake water from the soil during the estivation.
在巴西东南部的旱季，暗褐姬蛙（Leptodactylus fuscus）会进入休眠状态。采集了处于活跃状态和夏眠状态的暗褐姬蛙的血浆和尿液，并对其中的钾离子、钠离子和渗透压浓度进行了分析。将夏眠地点的土壤水势与暗褐姬蛙的渗透压浓度进行了比较。夏眠暗褐姬蛙的血浆和尿液渗透压浓度（分别为286.2±13.8和242.3±17.2 mOsm1(-1)）高于活跃暗褐姬蛙（血浆和尿液分别为240.3±12.8和112.7±15.6 mOsm1(-1)），血浆钾离子含量情况也是如此。活跃暗褐姬蛙和夏眠暗褐姬蛙的钠离子浓度相同。土壤水势相当于110 mOsm1(-1)的渗透压，这表明暗褐姬蛙在夏眠期间可能从土壤中吸收水分。
