Community Structure of Bivalve in the Seagrass Ecosystems in the Madong Bay Waters of Bugis Village Tanjungpinang City Riau Islands

Abstract

ABSTRACT

Sea grass ecosystem in the Madong Bay is inhabited by numerous aquatic organisms, including bivalve. A research aims to determine the community structure of bivalve in that seagrass ecosystemhas been conducted in July 2019.There were 3 stations, in the rivermouth, in the bay and in the sea. In each station, there were  2transect lines(25 m length), and distance between the line was 15 m. In each line, there were 4 quadrants(1x1 m²). Sampling was conducted twice a week for 2 weeks. Bivalve present inside the quadrant were sampled manually. Results shown that there were 8 bivalve species present, namelyPlacamen chlorotica, Anomalocardia squamosa, Callista lilacina, Circe scripta, Anadara granosa, Semele cordiformis, Trachycardium rugosum, Anadara gubernaculum. The diversity index (H’) was 1.965-2.242, the uniformity index (E’) was 0.356-0.472 and the dominance index (C’) was 0.225-0.262. The water quality parameters are as follows; Temperature was 29-31 ⁰C; acidity (pH) was 7; Salinity was 30-35 ‰; current speed was 0.14-0.15 m/s and DO was 6.7-6.9 mg/L.

 Keywords:Circe scripta, diversity index, uniformity index, dominance index