Abstract
Increasing degradation coral reefs ecosystem has created many concerns. Reduction of this damage can only be done with good and proper management of coral reef ecosystem based on existing condition. The condition of coral reef ecosystem can be determined by assessing its community structure. This study investigates community structure of coral reef ecosystems around Saebus Island, Sumenep District, East Java, by using satellite imagery analysis and field observations. Satellite imagery analysis by Lyzenga methods was used to determine the observation stations and substrate distribution. Field observations were done by using Line Intercept Transect method at 4 stations, at the depth of 3 and 10 meters. The results showed that the percentage of coral reef coverage at the depth of 3 and 10 meters were 64.36% and 59.29%, respectively, and included in fine coverage category. This study found in total 25 genera from 13 families of corals at all stations. The most common species found wereAcropora,Porites, andPocillopora, while the least common species wereFavitesandMontastrea. Average value of Diversity, Uniformity and Dominancy indices were 2.94, 0.8 and 0.18 which include as medium, high, and low category, respectively. These results suggest that coral reef ecosystems around Saebus Island is in a good condition.
Highlights
Saebus Island is one of the islands that located in Kangean Islands, East Java, Indonesia
The research is conducted on September to November 2016 at Saebus Island, Sapeken Sub-district, Sumenep District, East Java
Field observation Coral reef condition analyzed using Line Intercept Transect (LIT) observation [13] at 4 different stations at the depth of 3 and 10 m. coral reef data were recorded by measuring the diameter and record coral genus found along the transect
Summary
Saebus Island is one of the islands that located in Kangean Islands, East Java, Indonesia. This island is located at Sapeken Subdistrict, Sumenep District of East Java Province. Coastal areas of this archipelago have high potential of natural resources, one of the largest marine resources is coral reef ecosystem [1]. Coral reefs are known as tropical marine ecosystems with high productivity, which has important role on biodiversity including genetic and on fisheries productivity [3,4]. Food source, spawning and growth spots for fish communities [5], coral reefs become very important in Kangean Archipelago region where the majority of coastal communities have livelihoods in the fisheries sector [6]
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