Estudo de comunidade meiofaunística em lagoas costeiras do Rio Grande do Norte.

Abstract

The meiofauna is formed by metazoan organisms of reduced size ranging from 0.045 to 0.5 mm, which inhabit the interstices of aquatic ecosystems. This paper has the objective of characterize the taxonomy of meiofaunistic community, correlated to the abiotic factors of two coastal environments, the Bonfim lagoon and the Carcara lagoon, two ponds of distinct sediments but very close and both suffer anthropic interferences situated on Nísia Floresta in Rio Grande do Norte. Two collections were realized in the year 2016, one in June and another in October (atypically in June), both in the dry season, using four reference points in each pond. In each point it was extracted four biosedimentologicals samples using a PVC tube of 9,42 cm² of internal area and 10 cm deep, extra samples of sediments were collected to analysis of particle sizes and organic matter. In the laboratory the organisms were counted and classified by the level of the groups. After identifying the results were submitted to statistics analysis to determinate the density in each pond and in each point of collections as well as frequency of occurrence of each group and their relative abundance. In the Bonfim lagoon were found the following taxa: Nematodes, Ostracoda, Rotifera and Turbellaria, and in the Carcará lagoon, beyond these four groups, were found Copepoda and Tardigrada. The two ponds presented different levels of density and relative abundance, and the Carcará lagoon was the pond with greater density with Nematoda being the most abundant group, while the Bonfim lagoon, the abundance varied between the groups in each point.