BIODIVERSITAS POLYCHAETA DI PERAIRAN MUARA SUNGAI MUSI, DESA SUNGSANG SUMATERA SELATAN

Sungsang is a residential area that utilizes the coast of Banyuasin. Human activities can cause changes in water quality. Polychaeta is one of the unique benthic wills through the changes of composition that cause environmental pressure. This research aimed to identify the type of Polychaeta, analyze the community structure, and know the relation organic matter and Polychaeta density in Musi River Estuary, Sungsang Village, South Sumatera. This research was conducted in February 2021; the samples taken were Polychaeta samples and sediment samples of organic matter, as well as direct measurement of physical and chemical parameters of the water. The types of Polychaeta found to consist of family Lumbrineridae (Lumbrineris sp.) and Nereididae (Nereis sp). The density of Polychaeta ranged from 1.504-2.831 and/m2, with diversity index ranging from 0-0,68, uniformity index 0-0,32, and dominance index ranging from 0,51-1. The results of linear regression analysis show that organic matter had an effect of 29,76% on the density of Polychaeta. Based on PCA results for the relationship between density and community structure of Polychaeta with physical-chemical water parameters, the characteristic variables were temperature, pH, DO, density, diversity, uniformity, and dominance.