Struktur Komunitas Gastropoda pada Ekosistem Mangrove di Desa Lubuk Kertang Kecamatan Berandan Barat Kabupaten Langkat Provinsi Sumatera Utara

Abstract

The mangrove forest ecosystem is a transitional area between sea and land,ithas an extreme environment, which is influenced by tidal sea water, temperature and salinity of which always change. Gastropoda is one of the dominantphylummollusca classin mangrove forest that. Desa Lubuk Kertang’s Mangrove Forest is on area that has experienced expert land functions into tourist areas, agricultural land and settlements that change the mangrove zonation. This research is looking to know the structure of gastropods community and Gastropoda density at 3 mangrove zones; (Avicennia lanata, Rhizophora apiculata and Sonneratia alba).The results showed that there were 15 species Gastropods, is namely Achatinafulica, Cerithideaalata, Cerithideacingulata, Cerithideaobtusa, Chicoreuscapucinus, Cymatium pileare, Ellobiumaurimisdae, Ellobiumaurisjudae, Littorariamelanostoma, Littorariascabra, Murex tribulus, Neritabalteata, Nerita planospira, Pugilina cochlidium, Stramonita gradata, Telescopiumtelescopium and Terebraliasulcata. Diversity index ranged from 1,702 - 2,165 including medium category, Index ranged between 1,558 - 1,798 included in high category and dominance index ranged from 0,154 - 0,282 included in low category. The highest gastropoda density value was 31 individuals/m2 in the mangrove species Sonneratia alba, the highest density was in the Littorariascabra species, the lowest densities were in the Terebraliasulcata and Pugilinacochlidium species