By: Marchel, Felicia Zahida & Ign. Pramana Yuda
Nudibranchia, the largest order within Opisthobranchia, comprises approximately 3,000 species. Renowned as a sought-after subject for macro photography among divers, Nudibranchia remains a captivating aspect of marine biodiversity. Despite the popularity of Tulamben Waters in Bali as a favored macrobiota habitat, research concerning marine biota, particularly Nudibranchia in these waters, remains scarce.
This study employs two methodologies: direct observation to unveil species diversity and abundance, and belt transect methods to estimate density or abundance per sampling area, utilizing diving techniques. A transect line of 50 meters was employed at each observation site to assess abundance. The objective is to assess diversity levels, map various species distributions, and ascertain the abundance of Nudibranchia.
Regarding biodiversity, the study identified 31 species from 15 families, including Chromodorididae, Dorididae, Elysiidae, Facelinidae, Flabellinidae, Goniodorididae, Halgerdidae, Hexabranchidae, Phyllidiidae, Polyceridae, Hydatinidae, Costasiellidae, Elysiidae, and Limapontiidae. Meanwhile, employing the transect method revealed 12 species from 6 families, encompassing Chromodorididae, Facelinidae, Phyllidiidae, Aglajidae, Costasiellidae, and Elysiidae.
The calculated diversity index stands at 2.27, with the highest abundance recorded in the species Pteraeolidia ianthina, exhibiting a relative abundance of 0.19%. These findings contribute to understanding the richness and distribution of Nudibranchia within the Tulamben Waters, offering insights into the ecological dynamics of this diverse marine ecosystem.
Source: Jurnal Moluska Indonesia
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