KEPADATAN DAN KEANEKARAGAMAN JENIS FAUNA BENTOS (>1MM) PADA DAERAH PECAHAN KARANG DI PERAIRAN KELURAHAN MOLAS TELUK MANADO

Abstract

Benthic fauna is a group of benthic organisms that live on the bottom of the water or the bottom of the sediment or between sediments. This study aims to obtain an overview of the distribution and types of benthic faunal organisms measuring > 1mm in the waters of Molas Village at a depth of 1-3 m, especially around coral fragments. Benthos sampling was carried out using a grab sampler with three repetitions. The benthic sediment sample was sieved using a 1000 m (1.0 mm) sieve. The sediment retained in the sieve was then identified based on its morphological characters using a stereo microscope. Furthermore, the number of organisms found was counted and analyzed according to the calculation of the ecological index. The results of the identification of benthic faunal organisms >1mm obtained a total of 36 types of mollusks consisting of 34 species belonging to the class Gastropods and 2 species belonging to the class Bivalvia which were divided into 24 families and obtained an average density of 81.4 ind/m², Diversity Index 1, 47 (medium category), Uniformity Index 0.97 (high category) and Dominance Index 0.27 (nothing dominates).