Abstract. Aulia ED, Muzaki FK, Saptarini D, Setiawan E, Setiamarga D, Lutvianti ID, Rosyidah SK, Muhammad NA. 2021. Diversity of sea cucumber from intertidal area of Pacitan and Bangkalan, East Java, Indonesia. Biodiversitas 22: 2136-2141. Sea cucumbers have an important role in the regeneration and mineralization processes of marine sediments. They are echinoderm, and their existence influences the sustainability of other organisms in different types of marine ecosystems. The objective of the present study was to determine the diversity of sea cucumber at Tawang and Pidakan coasts in Pacitan, and Labuhan coast in Bangkalan with slight differences in habitat characteristics. Sampling was conducted from 1000 m2 marked plots using hand collecting during low tide. Species richness, composition, abundance, and diversity indexes such as Shannon-Wiener’s diversity index (H’), Simpson’s dominance index (D) and Pielou’s evenness index (J) were observed. The results showed that there were 19 species found in this study, which belonged to family Stichopodidae, Holothuruidea, and Synaptidae. The highest species richness, abundance, H’ and J value was from Tawang coast. Value of H’ was 2.620 in Tawang, followed by 2.001 in Pidakan, and 1.621 in Labuhan. The highest D index was at Labuhan coast (0.223) compared with Tawang (0.085) and Pidakan (0.158) coast.
Abstract. Aulia ED, Hadi TA, Utama RS. 2021. Sponge community (Porifera) in coral reef ecosystem in Sabang, Aceh Province, Indonesia. Biodiversitas 22: 3394-3402. Sponges are one of the most influential benthic organisms in coral reef ecosystems. Many studies about sponge communities have been carried out globally, from tropical to temperate regions. In Indonesia, however, sponge communities have not been adequately observed, especially their diversity and interaction with habitats. Sabang, a developing city located in the northwest of Indonesia, has a lack of information about benthic communities and no reports about sponges. This study investigated the sponge community (species richness, coverage, and morphological characters) and the interactions, both within sponges and with corals and substrates, in Sabang. The study found that the sponge richness (species and morphology) and coverage are categorized as poor, having only 24 species with seven morphologies, and coverage of 1.79 ± 1.03% (SE). The interaction analyses showed significant relationships occur among sponge variables but not between sponges and corals, nor between sponges and their substrates. These results could be attributed to the hydrodynamic-related stresses in Sabang, which are likely influenced by exposure to the open ocean, a condition that is less favorable to diversity and interaction. It is necessary to regularly monitor the condition of benthic communities in Sabang in order to better understand their stable state and detect any change over time.
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