Biodiversidade e distribuição da nematofauna em Recifes de arenito na região de Pirangi do Sul - RN .

Abstract

Sandostone reefs are favorable places for the life of several benthic organisms, due to being close to terrestrial systems, receivinge a relevant amount of sediment, which increases the supply of food for some organisms that live there. This work aims to characterize the structure and distribution of the nematofaunistic community in the sandstone reef region of Pirangi do Sul beach-RN. Two sampling were made in 2019, one in April (rainy season) and another in October (dry season). The sampling sites were along the sandstone reef area with six sampling points in the intertidal zones, each of these points with three replicateds, sediment material was also collected for granulometric analysis. The sediment presented fine to medium sand granulometry, with fine sand dominant in the rainy season. The nematofauna was represented by 13 genera: Anomonema, Ascolaimus, Bathylaimus, Daptonema, Halalaimus, Metadesmolaimus, Monoposthia, Nemanema, Nudora Rhinema Prorhynchonema, Rhynchonema, Thalassomonhystera. The dry season presented a higher density of organisms compared to the rainy season, the genus Daptonema had the highest frequency of occurrence in both periods, occurring in 72% of the samples, showing similarities with other studies realized in reef areas.