Diversity of mollusks in the Segara Batu Lumbang mangrove forest, Pemogan Denpasar Bali

Research has been conducted on the diversity and distribution of mollusks from the Gastropod and Bivalvia class along the Segara Batu Lumbang Mangrove Tourism. The study was conducted in February to April 2023. Sampling was carried out in four mangrove forest sites namely in BL1, BL2, BL3 and BL4. In each site, three square plots are placed, so the total number of squares is 12 squares. Each square measuring 1m x 1m. The density of the mollusk species is determined based on the number of individuals per unit area, the diversity of mollusks species is analyzed by the Shanon-Wiener diversity index and the mollusks distribution using the frequency of attendance. The results of the study were found 33 species of mollusks consisting of 25 species from the gastropod class and 8 species from the Bivalvia class. The diversity of mollusks species is included in the medium category and the evenness index including the Very equitable category. This indicates that the condition of mangroves in Segara Batu Lumbang is a good/stable category. Some mollusk species whose density is high enough is Terebralia palustris (8.17 individuals/m2), Littoraria scabra (4.67 individuals/m2), Littoraria undulata (2.17 individuals/m2) and Anadara antiquata (2.25 individuals/m2). Based on the frequency of its distribution/presence, 4 species of gastropod are included in the moderate category (50%≤fi≤ 75%), namely Littoraria scabra, Littoraria undulata, Telescopium telescopium, Terebralia sulcata and one species namely Terebralia palustris included the category of frequent/absolute (FI>75%). One species from the Bivalvia class is the Bengalensis polymesoda of the frequency of its presence including moderate. Mollusks from the gastropod class can be found in roots, stems, leaves of mangrove plants and substrates, while mollusks from the Bivalvia class are generally found in the mangrove habitat substrate.