%0 Journal Article %T Avalia£¿£¿o ecotoxicol¨®gica preliminar das ¨¢guas das bacias hidrogr¨¢ficas dos rios Tarum£¿, S£¿o Raimundo e Educandos %A Rodrigues %A D¨¦borah Oliveira %A Silva %A Sergio Luiz Rodrigues da %A Silva %A Maria do Socorro Rocha da %J Acta Amazonica %D 2009 %I Instituto Nacional de Pesquisas da Amaz?nia %R 10.1590/S0044-59672009000400021 %X the tarum£¿, s£¿o raimundo and educandos basins, and their tributaries, are impacted by antropic influence. this study tried to evaluate the water toxicity of the hydrographic basins, through acute toxicity bioassay using daphnia similis as test-organism and physical and chemical analysis. the results showed that, of the three basins, the water from tarum£¿ caused the most deleterious effect on d. similis. %K ecotoxicology %K acute toxicity %K daphnia similis. %U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0044-59672009000400021&lng=en&nrm=iso&tlng=en