Community Structure of Mollusca in Seagrass Beds Padaido and Aimando Islands Biak Numfor Regency, Papua

Community Structure of Mollusca in Seagrass Beds Padaido and Aimando Islands Biak Numfor Regency, Papua. Mollusca is one of marine biota which is commonly found in seagrass beds and largely utilized by inhabitants in Biak. However, information about the diversity and abundance of mollusca in Padaido Aimando Islands, Biak Papua is still limited. The research about mollusca composition in the seagrass beds of Padaido Aimando Islands, Biak was conducted in April – October 2014. Sampling method using quadrat transect from the beach toward the sea at 15 stations. Mollusca samples preserved in alcohol 40%, then it was cleaned and identified in the laboratory. In this research was found 239 species of mollusca, which consists of 177 species from Gastropods and 62 species from Bivalves. Mollusks gastropod that have high distribution is Monetaria annulus, Conomurex luhuanus dan Canarium urceus , while of class Bivalvia is Anadara antiquata . The highest value index of species diversity (H) is found at Station 7 (3.951) and the lowest at Station 14 (3.077). Value index of species richness (d) ranged between 9.041 and 10.883 and evenness index value (J) ranged between 0.768 and 0.99. While the dominancy index ranged from 0.020 to 0.092. Based on similarity index, Station 3 has a high similarity with station 4. This research provides valuable information on the diversity and abundance of mollusca which can be useful for decision making aimed at the management of mollusca resource in Biak.