Há impacto sobre a comunidade de meiofauna em uma lagoa de exploração de água?

Abstract

This research aims to contribute knowledge about the meiofaunistic stock of freshwater environments in the semiarid region of Paraíba, performing the taxonomic recognition of this community through the analysis of sediments collected in a lake located in the municipality of Araruna-PB. Sediment samples were collected during the months of October, November and December, in the dry period of the year 2020. Regarding temperature, there was a minimum variation from one month to another, in October it was measured 24.8°C, in November 26.8°C and 24.1°C in December. Organic matter ranged from 0.28% to 23.38%. As for the granulometry, the results obtained through the analysis in the Sysgram program, showed that the average grain size varied among medium sand, coarse sand and fine sand, with a predominance of medium sand, being all poorly selected. The meiofaunistic community was represented by 10 táxon. The results obtained in the samples prospected in the months of October, November and December, show Nematoda and Rotifera as constant groups, having its frequency equivalent to 100% in all replicates. It was analyzed through ANOSIM if the population structure of the meiofanistic organisms prospected along the lagoon modified temporally and spatially. In the months of November and December, the Gastrotricha group appeared, which became frequent in these months. with a relative abundance of 62.70% and 55.83% respectively, thus becoming dominant in these months, and changing the existing pattern for this lagoon, thus becoming dominant in these months, and changing the existing pattern for this lagoon. It was observed that the community behaves almost uniformly along the lagoon, as nor the organic enrichment observed at point two with the cultivation of vegetables did not change its pattern. It was concluded that there was no impact on the meiofauna of the watercexploration lagoon analyzed.