Karakteristik Fisika-Kimia dan Struktur Komunitas Moluska (Bivalvia dan gastropoda) di Pantai Cermin Sumatera Utara

Abstract

Many activities around Cermin Beach feared of mollusca (bivalvia and gastropoda) in Cermin Beach, North Sumatera. Under guided YUNASFI and ANI SURYANTI. can alter the water quality of Cermin Beach. Information and understanding of environmental change is indispensable in ecosystem monitoring efforts. This research aims to determine the status of the water quality seen on characteristics of chemical physics and community structure of moluska (bivalvia and gastropoda) in Cermin Beach, North Sumatera The result showed . This research had been conducted on Juni – July 2013 in Cermin Beach, sub-district Pantai Cermin, Serdang Bedagai District, North Sumatera. There are three station research, Station 1 : Tourism activities area; station 2 : around the mangroves area; station 3: around estuary area. There are three sampling in 2 months. quality of waters Cermin Beach seen from the pollution index includes a light polluted class. There are 28 genera of mollusca consist of 16 genera from bivalvia class and 12 genera from gastropoda class. Mollusca abundance data in station 1 is 35.527 ind/m3, in station 2 is 19.961 ind/m3 and in station 3 is 101.544 ind/m3. From abundance data in 3 stations showed diversity criteria, the spread of the number of individuals and community stability classified as moderate. Similarity index in three station still moderate, similarity values in 3 station is 0,4. Dominance index values showed 0,19, 0,15, and 0,11 for three station. It means, there is no type that dominate.