Community Structure of Gastropods in the Bay of Muara Angke Teluk Jakarta

Abstract

Muara Angke Bay is home to many types of gastropods. The purpose of this study was to determine
the structure of the gastropod community in the waters of the river. This research was conducted in
July-September 2021. There are 3 observation stations including the estuary area (station 1),
fisherman settlement area (station 2), and port area (station 3). There are 3 quadrants of gastropod
samples and water quality was taken 3 times in 1 week. Gastropod samples were taken by hand
collecting or by hand and given 10% formalin as a preservative. Parameters measured included
density, diversity index, and gastropod dominance index. Water quality parameters include
temperature, pH, current velocity, depth, and dissolved oxygen. The types of gastropods found
during the study were Melanoides sp and Pomacea sp. The density of gastropod species ranged
from 1.319 to 2.748 ind/m, the diversity index ranged from 2.59 to 3.47, and the dominance index
ranged from 0.27 to 0.34. Water quality parameters: temperature ranged from 29-300C, current
velocity 15.18-24.91 cm/sec, depth 12.2-26.5 cm, pH 6 and dissolved oxygen ranging from 4.5 to
5.6 mg/L. From the data obtained, it can be concluded that the gastropod community structure
obtained is in moderate criteria.