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Title: Ion fluxes of Metynnis hypsauchen, a teleost from the Rio Negro, Amazon, exposed to an increase of temperature
Authors: Baldisserotto, Bernardo
Val, Adalberto Luis
Keywords: Fresh Water
Potassium Channel
Sodium Channel
Adaptation, Physiological
Fresh Water
Potassium Channels
Sodium Channels
Issue Date: 2002
metadata.dc.publisher.journal: Revista Brasileira de Biologia
metadata.dc.relation.ispartof: Volume 62, Número 4 B, Pags. 749-752
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°C. After 18 h in the chambers, fish presented an influx of Na+ and Cl-, and the temperature raise to 33°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.
metadata.dc.identifier.doi: 10.1590/S1519-69842002000500003
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