Abstract
Sea urchins are marine biota that have many benefits for life, so there is a need for information about the existence of sea urchins. The existence of sea urchins in marine ecosystems has a significant influence on the ecological balance, one of which is for coral reefs, because sea urchins are one of the control of macroalgae populations. The purpose of this study was to determine the species abundance, diversity index, dominance index and distribution pattern of sea urchins (Echinoidea) at Lakey Beach, Hu'u District, Dompu Regency. This type of research is descriptive exploratory using purposive sampling method (chosen method) in determining the three research stations. The data obtained were analyzed using the species formula, the Shanon Wienner diversity index, the Simpson dominance index, and the Morisita index. The results showed that the highest species on the Lakey Coast were Echinometra mathei with values of 0.60 Ind/mò and Echinometra viridis with values of 0.45 Ind/mò. The diversity index of sea urchins at Lakey Beach is included in the moderate criteria with a species diversity index value of H'=1.03. The sea urchin dominance index in Lakey Beach is included in the low criteria with a species dominance index of 0.42. The distribution pattern of sea urchins on Lakey Beach includes two criteria, namely flocking and uniform. Types of sea urchins that belong to a grouped distribution pattern are Echinometra mathei and Echinometra viridis. While the types of sea urchins that have a uniform distribution pattern are Diadema setosum, Echinotrix calamaris (brown striped spines), Mespilia globulus, and Tripneustus gratilia. This research can be used as a reference and source of information to see the condition of the ecosystem in Lakey Beach, Hu'u District, Dompu Regency. So that the community and can preserve marine life such as sea urchins (Echinoidea) so that their lives can be maintained.
Highlights
Bulu babi umumnya dikenal sebagai landak laut, dalam bahasa Inggris disebut Sea urchin dan dalam bahasa Jepang disebut uni
The results showed that the highest species on the Lakey Coast were Echinometra mathei with values of 0.60 Ind/m2 and Echinometra viridis with values of 0.45 Ind/m2
Ekosistem Karang dan Lamun di PancuranSaintek Perikanan. 10(1):62-67. Zakaria IJ. (2013). Komunitas Bulu Babi (Echinoidea) di Pulau Sukai dan Pulau Selatan Sumatera Barat. Prosiding Semirata FMIPA Universitas Lampung. 381-387. Zulham, Nanda, Jaka., Ita Karlina, & Chandra Joei Koenawan (2018). Hubungan Kerapatan Lamun terhadap Kalimpahan Bivalvia di Perairan Desa Teluk Bakau Kabupaten Bintan. Universitas Maritim Ali Haji
Summary
Waktu dan tempat penelitian Penelitian dilaksanakan pada bulan Juni yaitu pada tanggal 7-14 Juni 2021 di Pantai Lakey Kecamatan Hu’u Kabupaten Dompu dengan memperhatikan surut terendah air laut. Surut terendah pada lokasi penelitian dapat dilihat dengan menggunakan aplikasi Tides. Stasiun penelitian diidentifikasi menggunakan pendekatan yang ditargetkan, yaitu teknik pengambilan sampel berdasarkan pertimbangan tertentu (Fachrul, 2008). Ada beberapa hal yang menjadi pertimbangan, berdasarkan karakteristik wilayah setiap stasiun yang dapat mewakili populasi, seperti luas wilayah penelitian yaitu luas kawasan intertidal, karakteristik setiap kawasan, kemampuan peneliti, keamanan lokasi penelitian, dan ketersedian waktu dalam melakukan kegiatan penelitian ketika pengambilan data dilakukan (Katili, 2011). Stasiun II dengan karakteristik wilayah yang terdapat bangunan hotel dan menjadi pusat wisata di Pantai Lakey kemudian di stasiun III terdapat tenda-tenda yang dibangun oleh masyarakat setempat untuk menampung rumput laut, selain itu juga banyak aktivitas wisata atau masyarakat setempat. Posisi atau titik stasiun ditentukan menggunakan aplikasi GPS (Global Positioning System) pada Handphone (HP).
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