Ion fluxes of Metynnis hypsauchen, a teleost from the Rio Negro, Amazon, exposed to an increase of temperature.
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.
Baldisserotto
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Departamento de Fisiologia, Universidade Federal de Santa Maria, CEP 97105-900, Santa Maria, RS, Brazil.
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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*
D015221:Potassium Channels; D015222:Sodium Channels