title: [Changes in body fluids of the frog Leptodactylus fuscus during estivation (Anura, Leptodactylidae)].
abstract: 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.
authors.affiliation: Departamento de Zoologia, Instituto de Biociências-UNESP, Rio Claro, Brasil.
authors.forename: A S
authors.initials: AS
authors.lastname: Abe
authors.forename: L S
authors.initials: LS
authors.lastname: Garcia
mesh_terms: D000818:Animals; D001001:Anura / Q000502:physiology*; D001826:Body Fluids / Q000502:physiology*; D004956:Estivation; D005260:Female; D008297:Male; D009994:Osmolar Concentration
vernacular_title: Alterações de fluidos corpóreos na rã Leptodactylus fuscus durante a estivação (Anura, Leptodactylidae).