Species and Density of Gastropods in the Rehabilitated Mangrove Ecosystems in the Kedaburapat Village Rangsang Pesisir Sub-District, Riau Province

Abstract

This study aims to examine the species and density of gastropods in the rehabilitated mangrove ecosystem in Kedaburapat village Riau Province. The research was conducted in July 2020. The method used was a survey method. In 2018 mangrove planted, 2 transect lines were placed in the mangrove, and in each line, there were 6 plots (2 m × 2 m). Two plots were in the lower area, 2 plots in the middle area and other 2 plots were in the upper area. In 2019 mangrove planted, similar method was used to sampled the gastropods. The gastropods samplings were conducted manually during low tide. The gastropod were then identified in the laboratory. The substrate was studied visualy. The difference in gastropods density between two mangrove areas was analyzed using the t-test. The results showed that the species of gastropods that lived in the mangrove areas planted in 2018 consisted Littoraria scabra, L. melanostoma, L. intermedia, L. lutea, Nerita balteata, Chicoreus capucinus. Meanwhile, in the mangrove areas planted in 2019 consisted, Littoraria scabra, L. melanostoma, L. intermedia, Nerita balteata, Chicoreus capucinus, Nassarius dorsatu, Sphaerassiminea miniata. The average density of gastropods in the mangrove area planted in 2018 was 6.68 ind/m2, while in 2019 was 7.04 ind/m2. The results of the t-test analysis showed that there was no significant difference in gastropod density between the two mangrove regions.