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Title: Ion fluxes and hematological parameters of two teleosts from the Rio Negro, Amazon, exposed to hypoxia
Authors: Baldisserotto, Bernardo
Chippari-Gomes, Adriana Regina
Lopes, Nilva Pereira
Bicudo, José Eduardo Pereira Wilken
Paula-Silva, Maria Nazaré N.
Val, Vera Maria Fonseca Almeida e
Val, Adalberto Luis
Keywords: Potassium Channel
Sodium Channel
Adaptation, Physiological
Potassium Channels
Sodium Channels
Metynnis Hypsauchen
Serrasalmus Eigenmanni
Issue Date: 2008
metadata.dc.publisher.journal: Revista Brasileira de Biologia
metadata.dc.relation.ispartof: Volume 68, Número 3, Pags. 571-575
Abstract: The aim of this study was to describe the effect of hypoxia on whole body ion fluxes and hematological parameters in two Amazonian teleosts: Serrasalmus eigenmanni and Metynnis hypsauchen. The increase of Na+ and Cl- effluxes on M. hypsauchen exposed to hypoxia may be related to an increase of gill ventilation and effective respiratory surface area, to avoid a reduction in the oxygen uptake, and/or with the decrease of pHe, that could inhibit Na + and Cl- transporters and, therefore, reduce influx of these ions. Effluxes of Na+ and Cl- were lower in hypoxia than in normoxia for S. eigenmanni, possibly because in hypoxia this species would reduce gill ventilation and oxygen uptake, which would lead to a decrease of gill ion efflux and, consequently, reducing ion loss. The increase on hematocrit (Ht) during hypoxia in M. hypsauchen probably was caused by an increase of the red blood cell volume (MCV). For S. eigenmanni the increase on glucose possibly results from the usage of glucose reserve mobilization. Metynnis hypsauchen showed to be more sensitive to hypoxia than Serrasalmus eigenmanni, since the first presented more significant alterations on these osmoregulatory and hematological parameters. Nevertheless, the alterations observed for both species are strategies adopted by fishes to preserve oxygen supply to metabolizing tissues during exposure to hypoxia.
metadata.dc.identifier.doi: 10.1590/S1519-69842008000300015
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