Caracterização de meiofauna e da nematofauna da barragem de poleiros, Barra de Santa Rosa-Paraíba, Brasil.

Abstract

The meiofauna invertebrates are at the base of most of the trophic chains of the most diverse terrestrial and aquatic biomes, adapting if the numerous environmental inclemencies. Because it is a region historically known due to water scarcity and a severe rainfall regime, the Northeast presents its importance for the Brazilian zoological survey. The present work had the objective of characterizing the structure of the meiofaunistic and nematofaunistic community in the two banks of the Poleiros dam, observing the anthropic interferences. The sampling was carried out in Poleiros Dam, in the municipality of Barra de Santa Rosa, Paraíba. Located in a micro-region called Curimataú Paraibano, where it has been studied over the years by the team that makes LABMEIO. Were chosen 3 points with 3 replicates in each margin representing the maximum possible the area in question. With the prospecting points, sediment was collected for granulometric analysis and organic matter, and abiotic factors (pH, salinity, oxygen and temperature) were determined. The whole meiofaunistic and nematofaunistic community and organic matter was a reflection of the anthropic action of one of the margins, where the degraded margin presented lower organic matter and silt, smaller numbers of total individuals and smaller amount of nematofauna genera. The results obtained in this research were in agreement with previous research, such as the Ostracoda taxon as the most abundant and its negative correlation with Nematoda and the dominance of the Monhysterides being the most representative genus.