The Gastropod and Bivalve of Bruit Island, Sarawak

Azzahra, binti Ahmad Kamaruzzaman (2015) The Gastropod and Bivalve of Bruit Island, Sarawak. [Final Year Project Report] (Unpublished)

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Abstract

Bruit Island is located at the northern edge of Rajang Delta under Mukah division in the district of Daro, Sarawak. There is lacking information of molluscs community in Bruit Island. The objectives of this study are to document the community structure of gastropod and bivalve of Bruit Island and to determine the correlation between the community structure and environmental parameters of water. This study focused on species composition, species density, species diversity, species evenness and species richness of gastropod and bivalve. The molluscs were collected by using five replicates of 1m × 1m quadrat within 100m2 plot in every station on an intertidal area in Bruit Island. A total of 15 species of gastropods and one species of bivalve were collected and identified. Cerithidea cingulata was the most abundant species followed by Assimineia brevicula and Nerita lineata. Community structure parameters were recorded highest at the mangrove habitats whereas the community structure parameters were recorded lowest at sandy beach habitat. Species diversity and species evenness of mollusc were strongly significant correlated with size of sediments at p<0.05. Higher percentage of silt and clay in a habitat resulted in higher diversity and evenness of gastropod and bivalve. Dissolved oxygen and pH of water also significantly correlated with the species evenness of gastropod and bivalve in Bruit Island.

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