COMPARISON OF VEGETATION AND TEREBRALIA PALUSTRIS (GASTROPOD) POPULATION STRUCTURE AT TWO MANGROVE FOREST SITES IN PULAU RAMBUT WILDLIFE RESERVE, KEPULAUAN SERIBU, DKI JAKARTA

• Main Author: Nafria Nandasari, Rena
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/37030
• Institution: Institut Teknologi Bandung

Zonation patterns in mangrove ecosystems can affect microclimatic conditions which in turn affect the associated plants and animals, one of which is Terebralia palustris. T. palustris is a gastropod species that plays an important role in nutrient cycling and is found to dominate in Pulau Rambut island, Kepulauan Seribu, DKI Jakarta. As detritivores, gastropods play a role in increasing the productivity of mangrove ecosystems. This study was conducted on 15-16 December 2018 and aimed to compare mangrove vegetation at two sites on Pulau Rambut with differing environmental conditions, and also compare the population density, distribution patterns, and population structure of T. palustris based on body size. Vegetation data were collected from four 10x10 m plots at two sites with different vegetation and environmental conditions (Site A and B), while 1x1m sized plots were used for gastropod sampling. Based on the results, it can be concluded that Site A is dominated by Rhizophora stylosa at all growth levels. Site B is dominated by Excoecaria agallocha at the tree and pole levels and Rhizophora stylosa at the sapling and seedling levels. The density of T. palustris in Site A is higher than in Site B, i.e., 31.5 ind/m2 and 7.75 ind/m2 respectively, with a clumped population distribution pattern at both sites. The average length and weight of T. palustris in Site A are greater than in Site B, i.e., 9.06 cm and 4.35 cm respectively for length and 46.83 g and 7.05 g respectively for weight. The condition factor of T. palustris at Site A and Site B indicates good condition with values of 5.22 and 4.72 respectively. T. palustris at both sites have negative allometric growth patterns.