Diversity of sea cucumber from intertidal area of Pacitan and Bangkalan, East Java, Indonesia

Abstract

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.

Seagrass ecosystems of Ritche’s Archipelago in the Andaman Sea harbor ‘Endangered’ Holothuria scabra Jaeger, 1833 and ‘Vulnerable’ Actinopyga mauritiana (Quoy & Gaimard, 1834) sea cucumber species (Echinodermata: Holothuroidea)

“…Our findings agree with previous study from Neil Island, which suggested these vulnerable sea cucumber species prefers mono-specific seagrass meadows rich in organic matter and fine grain sediments to fulfill their energy needs (Gole et al 2022). The presence of threatened sea cucumber species from intertidal seagrass meadows of ANI, indicates the importance of these mono and mixed seagrass species and their food and habitat provisions for infauna organisms, which has been observed for other seagrass ecosystems of the Indo-Pacific region (Kinch & Friedman 2008;Costa et al 2014;Aulia et al 2021;Arnull et al 2021;Gole et al 2022). This positive association between declining sea cucumber populations of India and intertidal seagrass species also emphasizes the need for continuous monitoring of seagrass ecosystems of ANI and India, and maintain the health of these seagrass ecosystems, which are under decline in Neil and Havelock islands of ANI (Mishra & Apte 2020;Mishra et al 2021).…”

“…Holothuria scabra Jaeger, 1833 and Actinopyga mauritiana (Quoy & Gaimard, 1833) have high value leading to increased fishing and over exploitation. H. scabra is economically important and famous for 'beche-de-mer' or 'trepang' which is highly valued in traditional diets and for medicinal purposes in China, Japan, Malaysia, Thailand, Vietnam, Indonesia and the Philippines (Purcell et al 2012;Arnull et al 2021;Aulia et al 2021). Similarly, A. mauritiana is also heavily fished for its commercial importance in traditional Chinese medicines (Raghunathan & Venkataraman 2014), and by subsistence fisheries as a direct food source (Kinch & Friedman 2008).…”

Diversity and abundance of sea cucumber (Holothuroidea) resources in the Waters of Duroa Island, Tual City, Maluku, Indonesia

“…Species density is the number of individuals per unit area; the density of each species at each station is calculated using the following formula (Aulia et al 2021).…”

Potential Carbon Stock of Seagrass Biomass in Malang Regency

“…Thus, research on blue carbon in seagrass beds helps us understand the contribution of this ecosystem in reducing CO2 concentrations in the atmosphere, which is a key factor in overcoming climate change [7], [8]. Seagrass beds also have function as habitats and food sources for various species of marine biota [9], [10], [11]. A decline in seagrass communities can threaten marine biodiversity and affect the marine food chain.…”