Abstract
Abstract The presence of seagrass in coastal waters has an ecological contribution to marine life’s sustainability, such as bivalves. This study aims to assess the structurer bivalves communities associated with seagrass and the relationship between seagrass communities’ structure and the environment against an abundance of bivalves—the Collected data using transect lines and squares. The data analysis used descriptive statistical analysis. Besides, a regression analysis was carried out between the seagrass community’s structure and its environment with the abundance of bivalves. This study found 40 species of bivalves that include 11 families (Veneroidae, Arcidae, Mytilidae, Cardidae, Pinnadae, Pteriidae, Mactridae, Donacidae, Pectinidae, Tellinidae, and Lucinidae). The next, Anadara antiquata has an abundance of top 1.43 ind/m 2 , and Atrina vexillum, chlamys luculenta, and Fragum unedo are the lowest of 0.003 ind/ m 2 . Simultaneously, the analysis results showed that the value of R 2 = 0.42 between the abundance of bivalves with the substrate’s depth. Values are different between seagrass closing with a lot of bivalves, wherein R 2 = 0.80. However, R 2 = 0.36’s value between the abundance of bivalves with a density of seagrass. Of the three parameters, the closure of seagrass is a parameter that can be used to identify the wealth of bivalves’ wealth in the location of the study.