DETERMINAÇÃO DA ESTRUTURA DAS COMUNIDADES DE MACROINVERTEBRADOS BENTÔNICOS NA SUBBACIA DO RIBEIRÃO SÃO JOÃO TO
AUTOR(ES)
LUIZ MARCOS COELHO DE SOUZA ARAÚJO JÚNIOR
DATA DE PUBLICAÇÃO
2008
RESUMO
This study was carried out in the sub-basin of the São João stream, Palmas TO, bearing as objective: 1) to describe the ecological characteristics (density, abundance, richness, Shannon-Wiener diversity, and evenness) of the assembly of aquatic insects; 2) to verify if there is exist similarity between the sampled assemblies; 3) to indicate which ones among the used environmental factors in the Rapid Assessment Protocol are determining the structure of the assembly of sampled aquatic insects. The samples were carried out in two consecutive periods of rain (2005 and 2006) using Surber sampler at the five sample stations with three replicate at distinct places. A total of 419 organisms distributed in nine orders and 23 families of insects were collected, families that are found in other water courses draining Cerrado regions. The most representative Orders were Odonata and Trichoptera with eight and six families respectively being the family most abundant Leptoceridae. The E2 station situated close to the headwater showed the greatest density 572,22 ind. m-2, on the other hand the lowest abudance (40,74 ind.m-2) was observed at the E5 station, that is located next to the estuary. The analyses of k-dominance and rarefaction indicated that the stations E2 and E5 presented high dominance. The analyses of Shannon-Wiener and evenness presenting variations in their values of the diversity of each sample station had not presented significant resulted. The index of Morisita-Horn pointed the pairs of stations (E1 and E2) and (E4 and E5) with high degree of similarity. The analysis of Co-inertia indicates that eight variables related to the velocity of the water (frequent run and riffles, run with the width of the canal), substratum (gravel, mud, and pebbles), diversity of habitat, and transparency of the water structuralizes the assemblies of aquatic insects.
ASSUNTO(S)
ecologia aquatic insects insetos aquáticos protocolo de avaliação rápida north region região norte rapid assessment protocol tocantins basin bacia do rio tocantins
ACESSO AO ARTIGO
http://tede.biblioteca.ucg.br/tde_busca/arquivo.php?codArquivo=436Documentos Relacionados
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