KELIMPAHAN DAN KEANEKARAGAMAN GASTROPODA PADA TIPE PERAKARAN MANGROVE Rhizophora sp. DAN Sonneratia sp. DI TELUK BENOA, BALI

Abstract

Mangrove ecosystems provide habitats and spawning grounds for a variety of aquatic biota, including gastropods. Rhizophora sp. and Sonneratia sp. have very different root structures as a form of adaptation to the environment. These morphological differences certainly create different microhabitats, which can affect the distribution, abundance, and diversity of benthic organisms, especially gastropods. The objective of this study was to determine the abundance and diversity of gastropods in both types of mangrove roots. The study was conducted from December 2024 to February 2025 in the mangrove ecosystem of Benoa Bay, Bali. A quantitative descriptive method was used. Research stations were selected using purposive sampling, with the main consideration being the difference in root types. Fifteen gastropod species from seven families were found on the roots of Rhizophora sp. and Sonneratia sp. mangroves in Benoa Bay. The highest abundance was found in Rhizophora sp. roots with a value of 25,78 ind/m², while Sonneratia sp. roots had a value of 24,78 ind/m². The gastropod diversity index in both types of roots was moderate with values of 1,962 and 2,006. The highest diversity was found in Sonneratia sp. roots and the lowest in Rhizophora sp. roots. The average soil pH values obtained were 6,268 and 6,272, and the average salinity was 18,667 ppt and 19,556 ppt. The substrate types obtained were mud and muddy sand. The environmental parameter values obtained are still suitable for supporting the life of gastropod organisms.