Estrutura e dinâmica da recolonização de invertebrados aquáticos em um lago temporário em uma área preservada de Cerrado e efeitos de metais sobre algumas espécies

Abstract

Given the urgency of using native species as test organisms in toxicity studies that reflect the typical properties of tropical systems and the need to analyze toxic or contaminating agents and evaluate possible effects on populations, communities and ecological interactions. This study aimed to analyze the invertebrate community and the factors that determine colonization in a temporary lagoon located in the Brazilian Cerrado, in order to generate information on the species that make up the local trophic structure, for later carrying out copper toxicity tests ( copper sulfate), cadmium (cadmium chloride) and mercury (mercury chloride) using native species. The sensitivity ranges of nine native species were determined, two amphibians (Boana faber and Scinax fuscovarius), one fish (Astyanax paranae), four aquatic insects (Culex sp., Berosini sp., Anax sp. And Belostoma sp.), an Oligochaeta (Dero digitata) and a Cladocera (Macrothrix spinosa). Subsequently, ecological interaction tests were performed, exposing two predators (Anax sp. And Belostoma sp.) To sublethal concentrations of the studied metals, and analyzing predation rates and food selectivity on four prey (Ceriodaphnia silvestrii, Ilyocryptus spinifer, Dero digitata and Chironomus inquinatus).