PLAGIASI_STRUCTURE OF MANGROVE VEGETATION AND THE RELATIONSHIP WITH THE ABUNDANCE OF AQUATIC BIOTA

Abstract

The mangrove ecosystem is a source of food for humans, especially fish, shellfish, shrimp, and crabs. Mangroves in coastal areas have a close relationship with local fishery production and are closely related to the composition and structure of the biota community. This study aims to determine the structure of mangrove vegetation, analyze the diversity and community structure of aquatic biota and analyze the relationship between mangrove conditions and the abundance of aquatic biota. Mangrove and biota data were collected at 16 stations using line-transect and plot methods. Mangrove data analysis was carried out based on Bengen (2000), and aquatic biota was analyzed using the Shannon-Weaver diversity index and the Simpsons dominance index. The results showed that the mangrove vegetation in Angsana Village consisted of 10 families and 15 types of mangroves. The dominant stand at the study site was Rhizophora apiculata, followed by Ceriops tagal and R. mucronata. The highest tree species density was at East Station 4 (0.310 ind/m2), and the lowest was at West Station 1 (0.125 ind/m2). The composition of aquatic biota at the research site is 27 species from mollusks and crustaceans groups. The highest biota abundance was at East Station 3, which was 10.17 ind/m2, and the lowest was at West Station 1, which was 2.67 ind/m2. The simple linear regression test results showed a significant relationship and influence between the density of mangrove trees and the abundance of aquatic biota of 48.1%, with the regression equation Y= 0.099 + 0.18X.