Fluktuasi Kepadatan Megabentos Di Perairan Kendari, Sulawesi Tenggara

Abstract

Coral reef is an ecosystem which provides suitable habitats for sgroups of biota that has important ecological and economic values which can be used as bio-indicators to assess the health of the environment. Research on megabenthic fauna in Kendari waters and its surroundings, Southeast Sulawesi was carried out at nine permanent stations in 2015 to 2018. The data was collected using the Benthos Belt Transect method that modified from the Belt Transect method on 8 types or groups of megabenthos in these waters. The purpose of this study was to determine the density fluctuation of megabenthic fauna over the years. The mean density of individuals found at each station during the study did not differ significantly. The Kruskal-Wallis test on density of megabenthic fauna during this period of times did not show a significant difference (H = 28.511 > df 7 = 14.067). Drupella spp. was the group species of megabenthic fauna with the highest density each year (1,079-1,738 ind/ha), while lobster was the group species of megabenthic fauna with the lowest density each year (0 - 39.7 ind/ha). The crown of thorns starfish Acanthaster planci had the highest fluctuation where density increased from 28.3 to 71.4 ind/ha.

The condition of megabenthos and reef fish in coral reef ecosystems in Aru Islands National Conservation Area, Southeast Maluku, Indonesia

“…The density of Drupella cornus at all observation stations was in the relatively lowdensity range (0.29 individuals/m 2 ). The density of Drupella in the Aru Islands was lower than those from the waters of Perlang Village, Bangka Belitung [25], Kendari waters [26] or East Sumba waters [20]. However, the density of Drupella snails in Senggigi Beach was slightly higher than the density of Drupella from nearby waters, namely in Sekotong Bay [27] or other areas such as Buton Island [19] and Waworaha waters [28].…”

Pioneer assessment on megabenthic community suggest the recent ecological condition of coral reef in Senggigi Beach, Western Lombok Island, Indonesia

“…Thus, the presence of drupella snail in Sengigi Beach is still far from potentially threatening the corals. The density of drupella snail population in Senggigi Beach is much lower than those from Perlang village waters, Bangka Belitung (Akbar et al 2019), Kendari waters (Arbi et al 2020), or East Sumba waters (Cappenberg and Akbar 2020). However, the density of drupella snail in Senggigi Beach is slightly higher than the drupella's density from the nearest waters, which is in Sekotong Bay (Ghafari et al 2020), or from other areas such as from Buton Island (Cappenberg and Mahulette 2019) and Waworaha waters (Wulandari et al 2020).…”

“…It could be the reason for blue starfish only appears on the outermost station during the 2 years of the survey, because the wave currents and proximity from the shoreline bring about low levels of sedimentation and pollution in that area. In a reasonable population size, blue starfish live in confined spaces on the surface of rubble or coralline algae among good healthy corals (Laxton 1974;Arbi et al 2020) and acts as a grazer that controls the algae population, indirectly facilitate the open space for coral recruit attachment (Zamani 2015). Therefore, it can be said that the coral reef ecosystem conditions in the 2 outer stations are better than the other stations.…”