Abstract. Jompa J, Umar W, Yusuf S, Tassakka ACM, Limmon GV, Rahmi, Putri AP, Halwi, Tamti H, Moore AM. 2020. Genetic patterns of the corals Euphyllia glabrescens and Lobophyllia corymbosa across the Indonesian Archipelago. Biodiversitas 21: xxxx. Scleractinian corals can reproduce in several ways, with two main sexual reproduction modes known as brooding and broadcast spawning. In this study, we described patterns of genetic variation within and connectivity between coral populations in western Indonesia (Seribu Archipelago), central Indonesia (Spermonde Archipelago), and eastern Indonesia (Ambon). We sampled two readily identifiable corals popular in the marine aquarium trade, one species widely reported as a brooder (Euphyllia glabrescens), the other as a broadcast spawner (Lobophyllia corymbosa). The mitochondrial COI genome was amplified for 117 samples. Within-population genetic variation was high, especially at the eastern Indonesia (Ambon) site. The genetic connectivity patterns were similar for the two corals, with high connectivity between the Seribu and Spermonde Archipelagos (despite a geographical separation of more than 1,000 km) and a lack of connectivity between these two sites and Ambon. These results indicate a potential barrier to gene flow between coral populations in western/central Indonesia and those to the east of Sulawesi Island.
Serasah mangrove merupakan sampah organik berupa daun, ranting, buah dan atau bunga mangrove yang sudah mengering dan berubah dari warna aslinya. Serasah mangrove memiliki peran yang sangat penting bagi ekosistem mangrove, karena menjadi sumber makanan bagi organisme perairan, semakin banyak serasah yang dihasilkan oleh hutan mangrove maka semakin banyak organisme yang akan datang untuk memakan serasah, sehingga keanekaragaman organismenya semakin tinggi. Penelitian ini bertujuan untuk menganalisis tingkat kerapatan Rhizophora sp., menganalisis produktifitas serasah Rhizophora sp., mengetahui jenis serasah Rhizophora sp. yang dominan ditemukan, dan menganalisis hubungan antara kerapatan Rhizophora sp., dengan produktifitas serasah Rhizophora sp. Hasil penelitian ini diharapkan agar dapat menjadi bahan informasi bagi stakeholder sehingga dapat meningkatkan kesadaran masyarakat untuk melestarikan ekosistem mangrove. Penelitian ini dilaksanakan selama 28 hari berturut-turut di Ekowisata Mangrove Lantebung Kota Makassar dengan transek line berukuran 10x10 meter dan litter trap untuk menampung serasah yang jatuh yang berukuran 7x7 meter. Hasil penelitian menunjukkan bahwa pada kedua stasiun termasuk dalam kategori kerapatan mangrove sedang, dimana produktivitas serasah Rhizophora sp. pada stasiun 1 dan stasiun 2 adalah 23,78 gram/m2/minggu dan 46,47 gr/m2/minggu. Serasah Rhizophora sp. yang dominan ditemukan adalah berupa daun senilai 37,19 gr/m2/minggu, disusul oleh serasah ranting, buah dan tidak ditemukan serasah bunga selama penelitian. Selanjutnya untuk hubungan kerapatan mangrove dengan produksi serasah setelah diuji menggunakan Uji Regresi memeroleh nilai R2 = 0,812, nilai ini mendekati 1 sehingga tergolong memiliki hubungan yang erat.
Many sea urchins, including the collector urchin Tripneustes gratilla, are well known for their role as herbivores, contributing to the control of fast growing macroalgae that can potentially overgrow and dominate seagrass beds and reef flats. Tripneustes gratilla is a short-spined sea urchin that can be easily found and collected by hand from the seagrass meadows which are their main habitat, especially during low tide. The exploitation of this species in Indonesia began to expand several years ago when the demand for T. gratilla gonads started to rise, for both commercial purposes and household consumption. This study aimed to determine the population and distribution of T. gratilla in seagrass ecosystems with different conditions across the Spermonde Archipelago, South Sulawesi, Indonesia. The results indicate that T. gratilla population abundance and size distribution are affected by several factors: seagrass condition, water quality, and the intensity of sea urchin collection. The results also emphasize the urgent need for developing and implementing effective management to ensure the sustainability of this important sea urchin species.
Sea urchins were ecologically and economically important biota, but scientific information on sea urchins is still very minimal and there is no ongoing monitoring. The purpose of this study was to determine the density, abundance, community structure, and distribution patterns of sea urchins in the intertidal zone of Karanrang Island, Pangkep Regency. The research in June-July 2022 was carried out at high and low tide using three transects measuring 1 x 1 m consisting of four plots measuring 50 x 50 cm. Determination of stations based on information from local residents to get observation stations based on tidal conditions. The results showed that three species of sea urchins from two families were found, namely Diadema setosum, Echinothrix calamaris, and Tripneustes gratilla. The species of D. setosum was found to be very abundant (97.3-97.6%) and tended to be more abundant during high tide than during low tide. The index of diversity and uniformity of porcupine species is low (H' = 0.130-0.142 and E = 0.118-0.129). The species dominance index was in the range of 0.946-0.953 indicating high dominance of D. setosum. Spatially, D. setosum had a uniform distribution pattern, whereas E. calamaris and T. gratilla were distributed in clusters. Further spatial and temporal research is needed to comprehensively determinant the conditions of the sea urchin population on Karanrang Island, Pangkep Regency.
Abstrak. Tujuan pengabdian Kuliah Kerja Nyata -Pembelajaran dan Pemberdayaan Masyarakat (KKN-PPM) ini adalah memberdayakan masyarakat agar memiliki kapasitas sehingga dapat menjadi bagian dari pengelolaan pulau wisata Camba-cambang. dan meningkatkan kemampuan mahasiswa dalam melaksanakan pengabdian kepada masyarakat. Pendekatan pemberdayaan yang digunakan adalah participatory rural appraisal, participatory tecnology development, dan community development dengan metode pelatihan, demonstrasi plot, dan pendampingan. Program kerja yang dilaksanakan dinamakan Catur Program Kerja, yaitu :(1) Pengembangan fish apartment, (2) Diversifikasi olahan hasil perikanan dan desain kemasan, (3) Penanganan sampah plastik, dan (4) Budidaya sistem IMTA. Operasional kegiatan meliputi koordinasi dan sosialisasi, penyiapan administrasi, pelaksanaan panca program kerja, serta monitoring dan evaluasi. Evaluasi dilakukan dengan menggunakan instrumen pre test dan post test serta pengamatan dan penilaian kinerja. Program KKN-PPM di lingkar pulau wisata Camba-cambang dapat meningkatkan pengetahuan dan keterampilan kelompok sasaran yang terdiri dari nelayan dan pembudidaya, ibu-ibu rumah tangga dan remaja putri, organisasi pemuda, siswa sekolah dan anak-anak putus sekolah. Kelompok sasaran telah meningkat pengetahuan dan keterampilannya dalam memanfaatkan potensi sumberdaya pulau, khususnya yang terkait dengan catur program kerja. Program pengabdiaan KKN-PPM ini juga dapat meningkatkan kompetensi teknis mahasiswa dalam pemberdayaan masyarakat.
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