Density and biomass of Campsurus sp. (Ephemeroptera) and other macroinvertebrates in an Amazonian lake impacted by Bauxite tailings (Lago Batata, Pará, Brazil)

Abstract

For 10 years (1979 to 1989) Lake Batata received about 18 million cubic meters per year of effluent from the washing of bauxite. About 30 % of its area was impacted. The main goal of this study has been the to evaluation of the effects of the bauxite tailing dumping on the density and biomass of the benthic macroinvertebrates community and, especially, on the population of Campsurus sp. Three sampling