IDENTIFIKASI KEANEKARAGAMAN MOLLUSCA SEBAGAI BIOINDIKATOR KUALITAS PERAIRAN DI AREA PERSAWAHAN DAN DAS KECAMATAN GERIH KABUPATEN NGAWI

Abstract

Mollusca is a soft-boned animal (from the Latin molluscus, soft), and largely secretes a hard protective shell made of calcium carbonate. Mollusca plays a very important role in this life. Some species of this phylum become a source of protein for humans, as an environmental bioindicator. In addition, Mollusca can be a pest for agriculture. The objective of the research is to know the diversity and abundance of Mollusca in the rice field and river area of Gerih Village Gerih District of Ngawi Regency as a module containing Mollusca diversity found around the rice field and river area. The method used in this research is the cruising method following the pattern of plots of rice fields and river that have been determined, and sampling using quadrant sample technique. Six species of Mollusca from 4 classes, four species of Gastropoda class were Pilla ampullaceae, Achatina fulica, Sulcospira testudinaria, Tarebia granifera, and 2 species of Pelecypoda class were Pilsbryoconcha exilis, Corbicula javanica. Pilla ampullaceae has a high abundance, while the lowest abundance is the species Corbicula javanica.