The aim of this study was to determine the density, species composition and community structure of makrozoobentos on seagrass areas and its relationship with the percent cover of seagrass in Pulau Bonebatang, Makassar. Data collection on seagrass and makrozoobentos was performed on the same transect (size 1 m2) with 3 replications. Sampling was done on each transect systematically with 20 m distance each other along the line perpendicular to the shore starting from unvegetated area up to the coral area where no more seagrass. Sampling was conducted on four stations (north, south, east and west) of the island based on the presence of seagrass. Percent cover of seagrass and seagrass species observed in each transect were noted. Makrozoobentos obtained were identified to the taxonomic level possible. The study found as many as six seagrass species which were scattered in every station, namely, Thalassia hemprichii, Enhalus acoroides, Halodule uninervis, Halophila ovalis, Syringodium isoetifolium and Cymodocea rotundata, with the percentage of seagrass cover on the island ranged from 50.5 to 74.5 % and classified in good condition. It was found as many as 133 species of macrozoobenthos spread over station consisting of 91 species of gastropods, 22 species of bivalves, 2 species of asteroids, three species of echinoids, 4 species of crustaceans, 8 species of polychaetes, and 3 species of sipunculids. Makrozoobentos highest density was found in the station which has six different seagrass species in which T. hemprichii, C. rotundata, H. ovalis and E. acoroides possess the largest seagrass species composition. The results of correlation analysis showed no relationship between density and number of species of makrozoobentos with the percent cover of seagrass.
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