THE RELATIONSHIP BETWEEN MANGROVE VEGETATION AND BIVALVIA ABUNDANCE IN MUARA BOJONG SALAWE, PANGANDARAN, JAWA BARAT

• Main Author: AL-SAKINA, NASHIHA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/50719
• Institution: Institut Teknologi Bandung

Muara Bojong Salawe is an estuary area which located in Pangandaran Regency. This estuary is the meeting place of three tributaries, namely the Cijalu River, the Cijulang River and the Cikiray River. Mangrove ecosystem in this area is important because besides being a barrier to high waves and sedimentation, it is also a living place for bivalves. Moreover, the high level of bivalve occupation in mangroves is assumed to be one of the factors which causing the discovery of the condition of several mangrove stands that had damage to the leaves and stems. Therefore, this study aims to determine the distribution pattern of bivalves based on the morisita index and to know the relationship between mangrove vegetation with bivalve abundance. The results of this study are expected to be a reference in management of the estuary ecosystem in Muara Bojong Salawe. Furthermore, the research was conducted by using the vegetation analysis method with a multilevel quadratic plot measuring 10 mx 10 m and 5 mx 5 m placed at three stations, followed by making sub-plots measuring 1m x 1m to calculate the abundance of bivalves. Index calculation Morisita was carried out to find out the distribution pattern of bivalves followed by statistical testing to know the relationship between vegetation parameters and bivalve abundance. In addition, the association level calculation was also carried out between mangrove and bivalve vegetation. The results showed that the Rhizophora mucronata species had the highest density value (3,866.67 ind / ha) compared to Avicennia alba and Sonneratia alba. The result of calculation of base area per hectare (LBDS) showed the highest value (10,643.56 m 2 / ha) at the 3rd station followed by the 2nd station and 1st station. The highest root density value was obtained at the 2nd station with a density value of 122.66 roots / m2. The density value was obtained by root measurements only for Avicennia alba. Moreover, the highest abundance of bivalves obtained at the 3rd station with an abundance value of 641 individuals / m2. The bivalves found were Saccostrea cucullata species. The distribution pattern of bivalves was included in a grouped pattern based on calculations morisita index. According to the measured water environment parameters, namely salinity, the temperature and pH of Muara Bojong Salawe are suitable for mangrove habitat and also bivalve. The strongest relationship of bivalve and mangrove ecosystem based on linear regression calculation is the relationship between abundance of bivalves and area basic fields per hectare (LBDS) with the equation y = 0,0186x + 128.75 with a value of R2= 0.8608, and the correlation values amounting to 0.92. The three types of mangroves found were known to be positively associated and have very strong association height with bivalves based on the calculation of the value of E (a) and the Ochiai index value.