UM ENSAIO SOBRE A ADAPTAÇÃO DE Pygocentrus nattereri À VARIAÇÃO SAZONAL DAS ÁGUAS DO LAGO MAMIRAUÁ RESERVA DE DESENVOLVIMENTO SUSTENTÁVEL MAMIRAUÁ

Mauricio Camargo, Helder Queiroz

Abstract


This study investigates habitat use of Pygocentrus nattereri Kner, 1858 at the highest m om ents of the flooding period (July) and during the low water period (October), and evaluates the hability to survive low oxygen concentrations and the production of sulphidric gas in the waters of Mamirauá Lake Mamirauá Sustainable Development Reserve. 12 experimental samplings were taken at six sites in Mamirauá Lake, and at Paraná Apara. With two experiments, carried out inside the waterbodies and in aquarium , we evaluated the effect of low D.O. concentration levels in the water on P. nattereri. Results show that even under
restraining conditions of oxygenation in the water, P. nattereri are able to keep their vital functions. Different situation is observed when the waters of Mamirauá Lake produce high concentrations of suphidric gas, and the individuals of P. nattereri die under this circunstance.

Keywords


Lago de várzea; Hipóxia; Gás sulfídrico; Pygocentrus nattereri; Piranha-caju; Várzea lakes; Hypoxia; Suphidric gas; Red-bellied piranhas



DOI: https://doi.org/10.31420/uakari.v1i1.6