Artículos de revistas
Alterações de fluidos corpóreos na rã Leptodactylus fuscus durante a estivação (Anura, Leptodactylidae).
Fecha
1990-02-01Registro en:
Revista brasileira de biologia, v. 50, n. 1, p. 243-247, 1990.
0034-7108
2-s2.0-18244424000
8776757457144680
Autor
Universidade Estadual Paulista (Unesp)
Institución
Resumen
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.