title: Ion fluxes of Metynnis hypsauchen, a teleost from the Rio Negro, Amazon, exposed to an increase of temperature.
abstract: The aim of this study was to investigate the effect on an increase of temperature on the net ion fluxes on Metynnis hypsauchen, a teleost species from the Rio Negro. Fish were collected in the Anavilhanas archipelago, Rio Negro, Amazon. After 24 h adaptation fish were placed in individual chambers served with a steady flow of recirculated water. Na+ and Cl- fluxes were determined at 26 and 33 degrees C. After 18 h in the chambers, fish presented an influx of Na+ and Cl-, and the temperature raise to 33 degrees C led to an efflux of both ions, which remained even after 6 h in this temperature. Six hours were not enough to promote a significant reduction of net ion effluxes, but certainly the fluxes would be in net balance after a longer period of time, since this species can be exposed to this temperature in its natural environment.
authors.affiliation: Departamento de Fisiologia, Universidade Federal de Santa Maria, CEP 97105-900, Santa Maria, RS, Brazil.
authors.forename: B
authors.initials: B
authors.lastname: Baldisserotto
authors.forename: A L
authors.initials: AL
authors.lastname: Val
mesh_terms: D000222:Adaptation, Physiological; D000818:Animals; D005399:Fishes / Q000378:metabolism* / Q000502:physiology; D005618:Fresh Water; D006358:Hot Temperature; D015221:Potassium Channels / Q000378:metabolism*; D015222:Sodium Channels / Q000378:metabolism*
chemical_list: D015221:Potassium Channels; D015222:Sodium Channels