Caracterização da comunidade meiofaunística com ênfase na nematofauna em ecossistemas aquáticos do Curimataú Oriental Paraibano.

Abstract

The meiofauna is consists organisms of microscopic organisms that are of great importance to aquatic ecosystems, these organisms are still little known, especially those that inhabit freshwater ecosystems. Phylum Nematoda is one of the main groups of meiofauna, occupying the most diverse environments and reaching high densities. The present study aimed at characterizing the structure of the meiofaunistic and nematopununistic community in the limnic ecosystems of the Paraibano Oriental Curimataú. A collection was carried out in each reservoir, the biosedimentological samples were collected between December 2016 and May 2017, in three reservoirs located in the cities of Cacimba de Dentro, Araruna and Tacima, in each reservoir were marked four distinct points of sampling and. The collected samples were fixed with 4% formalin and taken to the meiofauna laboratory of the UFCG/CES. These were washed in running water using a 0.044 mm mesh intervals sieve. The Nematoda were pick out on Dolffus plate, diaphanized and identified at the genus level. The meiofauna was composed of two groups Nematoda and Turbellaria, with dominance of the Nematoda group in all the reservoirs. The nematofauna was represented by 16 genera and, among the prospected reservoirs, the greatest diversity of genera was recorded in Tacima. The genera Monhystera and Mononchus were the only ones present in all the studied reservoirs. The statistical analyzes fulfilled in this study showed that the structure of the meiofaunistic and nematofaunistic community presented significant differences between the reservoirs, and Tacima was the one that most differentiated, presenting only one meiofaunistic group and the greater amount of genera.. The Nematoda group demonstrated once again their supremacy in community studies of aquatic environments.