COMMUNITY STRUCTURE OF FRESHWATER GASTROPODS IN NORTH KOLAKA REGENCY SOUTHEAST SULAWESI

Abstract

This research was conducted in January-March 2021 in North Kolaka Regency. The purpose of this study was to determine the structure of the freshwater gastropod community in North Kolaka Regency. This research applies a combination method (qualitative-quantitative) in determining the sampling location and sampling process. Determination of the sampling location using purposive sampling method based on the presence of gastropod communities and quantitative sampling using simple random sampling technique. Gastropod samples were collected manually using a metal hand scoop and gloves. The total gastropod sample obtained at 17 sampling points was 4250 individuals. The gastropod community structure in North Kolaka Regency consists of 19 genera and 33 species spread over 9 families, namely Achantinidae, Ampullariidae, Ariophantidae, Lymnaeidae, Neritidae, Pachychilidae, Planorbidae, Thiaridae and Viviparidae. The results of the analysis of the gastropod community structure showed a relatively stable condition, where the average abundance of gastropods reached 91.94 ind./m2 and the abundance of gastropod species ranged from 0.29-16 ind./m2. Gastropod species diversity was categorized as moderate with a maximum value (H' = 2.96) or close to H'>3 (high category), moderate evenness (E = 0.85), high species richness (R = 4.35), dominance which showed that there was no dominant species (C = 0.08) and the distribution of gastropods showed a clustered pattern (Ip = 0.01). The freshwater types in North Kolaka Regency are generally rocky rivers so that the gastropod community is dominated by the Neritidae and Thiaridae families, especially the Tarebia granifera, Melanoides tuberculata and Clithon corona.