Gastropod community structure in traditional irrigation system (Subak) Sembung, North Denpasar
Abstract
Rice fields are one of the artificial wetland ecosystems. The Subak Sembung area is one of the rice fields as well as an ecotourism area in Denpasar City. The existence of gastropods is quite a lot found in this rice field area. This study aims to determine the structure of the gastropod community in the Subak Sembung area and to determine the abiotic factors of gastropod habitat in the Subak Sembung area. Data collection was carried out from three stations in December 2021 to January 2022 using the transect method. The transect line is stretched horizontally parallel to the irrigation flow. Five quadrants measuring 1x1 m2 were placed alternately along the transect line and data on the number of individuals and species were taken from each quadrant. Overall, as many as 7 species were found, with a moderate diversity index with a value range of 1.34-1.40. The uniformity index of the three stations was found to be > 0.6, with a dominance index close to 0 or the species was evenly distributed and none was dominant. Abiotic parameters such as temperature with value around 26,7oC-27,4oC, pH 7,5-8, c organic 2,52%-3,03%, muddy substrate in all stations, nitraet 0,35mg/L-0,45mg/L, fosfate 0,35mg/L-0,39mg/L.
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