Biodiversidade meiofaunística em ecossistemas aquáticos do Curimataú Ocidental Paraibano.

Abstract

The meiofauna consists of important taxa in the aquatic ecosystem. A major component of this community is the phylum Nematoda which is important participant in trophic webs and energy ecosystem and can even act as a bio-indicator of environmental conditions. Meiofauna and more specifically the nematofauna of freshwater ecosystems, little is known compared to what is known to marine environments. This study aimed to characterize the meiofauna structure community and this nematofauna in limnic environments of the Curimataú Ocidental Paraibano through a characterization of the community and abiotic factors of 6 water reservoirs (Cairana, Jacaré, Arara, Soledade, Olivedos e Poleiros). Abiotic factors varied between prospected environments, especially salinity had high values, characterizing the water of reservoirs analyzed as brackish or in the case of the Olivedos dam, such as saline. There were significant differences between the community and meiofaunística nematofaunística 6 prospected environments. The meiofauna was composed of 9 higher taxa, with dominance of Nematoda, and Ostracoda and Turbellaria for some points. The nematofauna was represented by 16 genera and Monhystrella was the only genus present in all analyzed environments. In some reservoirs was also dominance Daptonema and Trefusia. Monhystrella hoogewijsi was identified for the Olivedos dam, where it was identified the first male of the species.. The Olivedos dam presented with a different meiofaunística community from others by high abundance of organisms and a nematofauna by the presence of an almost monospecific community. This research has brought new and relevant data to meiofauna Brazilian freshwater, for Monhystrella and biodiversity of the caatinga biome and thereby to awaken new research to investigate aquatic ecosystems of the Brazilian semiarid region.