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Ion fluxes and hematological parameters of two teleosts from the Rio Negro, Ama...
Baldisserotto, Bernardo; Chippari-Gomes, Adriana Regina; Lopes, Nilva Pereira; Bicudo, José Eduardo Pereira Wilken; Paula-Silva, Maria Nazaré N.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 dec...
Specialized metabolism and biochemical suppression during aestivation of the ex...
Mesquita-Saad, Lenise Socorro B.; Leitão, Marco Aurélio B.; Paula-Silva, Maria Nazaré N.; Chippari-Gomes, Adriana ReginaLepidosiren paradoxa (pirambóia) is the single representative of Dipnoan (lungfish) in South America. This species is considered a living fossil, in spite of some reports describing this fish as having a very specialized life style. It aestivates during the dry season, and has developed metabolic adaptations to cope with both flooding and drought. The literature describing its tissue ultra-structure shows high ...
Genetic differentiation in red-bellied piranha populations (Pygocentrus nattere...
Santos, Carlos Henrique dos Anjos dos; Sá Leitão, Carolina Sousa de; Paula-Silva, Maria Nazaré N.; Almeida-Val, Vera Maria FonsecaRed-bellied piranhas (Pygocentrus nattereri) are widely caught with different intensities throughout the region of Solimões-Amazonas River by local fishermen. Thus, the management of this resource is performed in the absence of any information on its genetic stock. P. nattereri is a voracious predator and widely distributed in the Neotropical region, and it is found in other regions of American continent. Howev...