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The benthic macroinvertebrates are among the main organisms used in the evaluation of environmental and biological monitoring in aquatic ecosystems. The distribution of these organisms is mainly determined by the type and diversity of habitats available to the community. This paper aims to contribute to the knowledge of the distribution of macroinvertebrates in the state of Mato Grosso, analyzing the macroinvertebrates orders and families occurring in a spring dammed in an agricultural land in the municipality of Campo Verde-MT, evaluating the structure of the community in rainy and dry periods The study area is located in the headwaters of Sao Lourenco River - TM, where soybeans, millet and cotton (latitude S 15 ° 37 '18.8 "W and longitude 55 o 10 '24.8") are cultivated. In its vicinity (ca. 30 m) one of its sources was dammed, sampled at its input (P2) in the limnetic zone (P3) and at its output (P4). In addition to these three points, we sampled one of its sources (P1) and a stream below the dam (P6). Each point was sampled six times, three during the rainy season and three during the dry season, with three replicates at each point. The increased occurrence of organisms occurred in the rainy season, with 216 organisms at P2 and P3 points. Diptera was the most abundant in the rainy season, represented by the Chironomidae family.

Variação Espaço-Temporal na Abundância de Ordens e Famílias de Macroinvertebrados Bentônicos Registrados em Área de Nascente, Campo Verde-Mt