Updated data is an essential requirement for carrying out research, planning, and policy briefs. The Coral reef triangle region is one of the areas with the highest diversity of marine biota and the discovery of new species in this area are increasing every year, much of this information is already available. However, most of the data is not available per region and is still scattered. This study aims to create a checklist and assessment of new species and a new record of fishes from this region over the last ten years based on several aspects, including species composition, pattern of distribution, endemicity, and depth using every source of the report and secondary literature data. The current new species and a new record of fish in the last decades combined consists of 360 species (268 new species and 92 new records). The most speciose group of family dominated by Gobiidae (93), followed by Labridae, Pomacentridae and Serranidae (18), Apogonidae (17), Dasyatidae (15), and the rest were ranged from 1-9 species per family. More than half of new species and new records are found in Indonesia, followed by the Philippines, Papua New Guinea, and Solomon Island. The result shows that cryptobenthic Families especially Gobiidae from genus Trimma and eviota are dominated the trend of new species and new record discovery and it is expected to rise over time while there will also be an emergence of some possibly new endemic species from major and rare families from the eastern part of Indonesia (West Papua and Papua New Guinea). Thus, the eastern part of Indonesia (Papua, Maluku, Aru Sea, and Papua New Guinea) and the northern part of Indonesia (North Sulawesi and Philippine) are suitable for exploration for marine biodiversity discovery research in the future.
Bolaang Mongondow waters in North Sulawesi is very important estuarine waters due to both land and ocean influenced oceanographic conditions. Observations of water quality along Bolaang Mongondow coast-line have been carried out in February 2019. This study aim to analyze the quality of sea water based on the physico-chemical parameters of Bolaang Mongondow waters. The parameters observed includes temperature, the clarity of water, salinity, dissolved oxygen (DO), phosphate, nitrate and PH. Samplings were conducted using Nansen tube on the surface layer (0-1 m) and near the bottom (> 15 m) on 9 research stations along Bolaang Mongondow coast-line. Measurements of temperature, salinity, brightness and pH are carried out in situ. Dissolved oxygen was measured via electrochemical method using AZ 8563 DO meter. Phosphate and nitrate were analyzed according to the light transmission method by using the 'Nicolet Evolution 100' spectrophotometer. The results obtained are water temperature ranging from 28.6-29.3 oC; salinity 28.0-32.5 o/oo; water clarity of 7.0-14.5 m; pH 7.36-7.80; dissolved oxygen 4.83-6.41 ppm; phosphate 0,005-0,0230 mg/l and nitrate 0,005-0,0090 mg/l. The statistical analysis using t-test showed that phosphate and dissolved oxygen in the water surface and close to the bottom of water were significantly different (t-hit> t-tab). The calculated index poluion calculation shows that the waters of Bolaang Mongondow ranged between unpolluted and lightly polluted. Variations in temperature, water clarity, salinity, dissolved oxygen, phosphate, nitrate and pH obtained in this study are still adequate to sustain marine life. Perairan Bolaang Mongondow, Sulawesi Utara adalah perairan estuari yang mempunyai peran penting karena kondisi oseanografi dipengaruhi oleh aktivitas yang di berasal dari daratan maupun laut. Pengamatan kualitas air laut di wilayah perairan Bolaang Mongondow telah dilaksanakan pada bulan Februari 2019. Tujuan dari penelitian adalah untuk mengukur kualitas perairan berdasarkan parameter fisik-kimia air laut. Parameter yang diteliti meliputi suhu, salinitas, kecerahan, oksigen terlarut, fosfat, nitrat, dan pH . Sampel air laut diambil menggunakan tabung Nansen pada lapisan kedalaman permukaan air (0-1 m) dan perairan yang mendekati dasar (> 15 m) pada 9 stasiun penelitian. Pengukuran suhu, kecerahan, salinitas dan pH dilakukan secara langsung di lapangan. Pengukuran oksigen terlarut, fosfat dan nitrat dilakukan di laboratorium dengan metode elektrokimia menggunakan DO meter AZ-8563. Untuk oksigen terlarut dan metode transmisi cahaya dengan alat spektrofotometer ‘Nicolet Evolution 100’ untuk fosfat dan nitrat. Hasil yang diperoleh yaitu suhu air berkisar antara 28,6-29,3 oC; salinitas 28,0-32,5 o/oo; kecerahan 7,0-14,5 m; pH 7,36-7,80; oksigen terlarut 4,83-6,41 ppm; fosfat 0,005-0,0230 mg/l dan nitrat 0,005-0,0090 mg/l. Oksigen terlarut dan fosfat yang terdapat di permukaan dan dekat dasar laut menunjukkan adanya perbedaan nyata (t-hit>t-tab) dengan menggunakan analisis uji t. Berdasarkan nilai indeks pencemaran menunjukkan perairan Bolaang Mongondow berada dalam kondisi baik hingga tercemar ringan. Variasi suhu, kecerahan, salinitas, oksigen terlarut, fosfat, nitrat dan PH yang diperoleh masih berada dalam kisaran angka normal untuk kehidupan biota laut.
Pengamatan kadar oksigen terlarut telah dilaksanakan di perairan Waigeo Barat, Raja Ampat, Papua Barat. Penelitian ini bertujuan untuk mengetahui kondisi oksigen terlarut dan Apparent Oxygen Utilization (AOU). Hasil analisa menunjukkan bahwa kadar oksigen terlarut di lapisan permukaan, 5 meter dan dekat dasar masing-masing berkisar antara 5.90-8.48 mg/l; 6.06-8.04 mg/l dan 6.12-7.98 mg/l. Berdasarkan nilai suhu dan salinitas yang diperoleh dari penelitian ini telah dihitung daya larut, derajat kejenuhan oksigen dan nilai AOU. Di lapisan permukaan nilai AOU berkisar antara (-0.01)-2.77 mg/l, di kedalaman 5 meter dan dekat dasar nilai AOU positif masing-masing berkisar antara 0.10-2.06 mg/l dan (0.16)-1.99 mg/l. Konsentrasi oksigen terlarut di perairan Waigeo Barat, Raja Ampat, belum menunjukkan dampak negatif terhadap lingkungan perairan dan masih sesuai dengan baku mutu air laut untuk biota laut. Kata kunci: Oksigen terlarut, AOU, Salinitas, Waigeo Barat, Raja Ampat
Ekosistem lamun merupakan perairan produktif yang memiliki fungsi untuk menstabilkan dasar perairan, dan dijadikan sebagai tempat perlindungan hewan. Keberadaan ekosistem Lamun di Indonesia tidak banyak diketahui dan dipelajari. Salah satu perairan yang memiliki padang lamun yang belum banyak diketahui status kondisi padang lamunnya yaitu Pantai Bulo. Pantai Bulo dijadikan sebagai wisata bahari karena memiliki keindahan yang menarik, juga sebagai tempat untuk menangkap ikan warga setempat. Aktivitas ini dapat mengganggu keberadaan lamun di daerah tersebut. Penelitian ini dilakukan untuk mengetahui kondisi padang lamun di Perairan Pantai Bulo Rerer, Kabupaten Minahasa, Provinsi Sulawesi Utara, dengan melakukan pengamatan substrat, komposisi jenis lamun dan persen penutupan lamun. Penelitian dilakukan selama bulan Juni sampai Agustus 2019. Hasil yang didapatkan yaitu ditemukan enam jenis lamun di perairan pantai Bulo Rerer yaitu Enhalus acoroides, Thalassia hemprichii, Cymodoceae rotundata, Cymodocea serrulata, Syringodium isoetifolitum, dan Halodule pinifolia, dengan kondisi padang lamun termasuk kategori kerusakan sedang. Diharapkan ke depannya dapat dilakukan pengawasan terhadap masyarakat serta pengenalan betapa pentingnya ekosistem lamun, agar tidak melakukan kerusakan di kawasan lamun dan berpartisipasi dalam rehabilitasi lamun.
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