The spatial trends in the community structure of gastropod assemblages the coastal area of Tomia Island, Wakatobi marine national park, Indonesia

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International Journal of Development Research

The spatial trends in the community structure of gastropod assemblages the coastal area of Tomia Island, Wakatobi marine national park, Indonesia

Abstract: 

Gastropod is one of among the most important taxa of marine benthic that plays ecological role for the ecosystem stability in the coastal area. This study was aimed to elucidate the spatial trends in the community structure of gastropod that assemblages the coastal area of Tomia Island, Wakatobi Marine National Park, Southeast Sulawesi, Indonesia. Two transect lines were placed perpendicularly to the coastline for observation the species and their individuals number of gastropod. Data were analyzed quantitatively for determining the importance value index, diversity index, evenness index, similarity index and ordination pattern. High species number of gastropod was found at the coastal area of Tomia Island, which represented by 23 species gastropod at open beach, and 26 species gastropod at unopen beach, respectively. The diversity index and Evenness Index were estimated as 2.44 bit and 0.78 at open beach, and 2.64 bit and 0.81 at unopen beach respectively. The Conomurex luhuanus was the most dominant gastropod at open beach, while the Strombus gibberulus was the most dominant gastropod at the unopen beach. Most of values of similarity index (SI) of gastropod among stands at the open beach were higher than those of at the unopen beach, indicating high similarity species composition of gastropod among sites at the open beach. Ordination pattern of gastropod both at the open and unopen beaches created 4 groups, while the degree of similarity of among stands decreased as increasing the distance of the stands. Therefore,  spatial trends of the community structure of gastropod assemblages the coastal area of Tomia Island seems to associated with the spatial heterogeneity.

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