This study aims to identify the type, size dimension, and composition of nematocysts from the Scleractinia coral, Stylophora subseriata. This study was carried out from March to May 2023. Observations and measurements of nematocyst cells were conducted using an Optika 4083 B3 microscope connected to a computer equipped with Optika View 7 software. S. subseriata has three main types of nematocyst, i.e., type I micro basic p-mastigophore (MpM- I), type II micro basic p-mastigophore (MpM-II) and micro basic b-mastigophore (MbM). Type MpM-I has an average capsule length of 182.10 µm, capsule width of 38.98 µm, and shaft length of 76.45 µm; MpM-II has an average capsule length of 166.72 µm, capsule width of 41.60 µm, and shaft length of 108.48 µm; and MbM has an average capsule length of 154.84 µm and capsule width of 30.96 µm. The nematocysts composition consists of MpM-I 26.67 %, MpM-II 23.33 %, and MbM 50.00 %. The MbM type is nematocyst dominant in this coral species. Future study is recommended to examine the comparative characteristics of nematocysts from S. subseriata with other species of corals in the same genus to determine the specific nematocyst of each type of coral with the role of their particular types of nematocyst. Keywords: Bulutui coast, nematocyst, North Minahasa, Scleractinia, Stylophora subseriata Abstrak Penelitian ini bertujuan untuk mengidentifikasi tipe, dimensi ukuran dan komposisi nematosit dari karang Scleractinia, Stylophora subseriata. Studi ini dilakukan dari Maret - Mei 2023. Pengamatan dan pengukuran sel nematosit dilakukan menggunakan mikroskop Optika 4083 B3 yang terhubung dengan komputer yang dilengkapi software Optika View 7. S. subseriata memiliki tiga tipe nematosit utama, yaitu microbasic p-mastigophore tipe I (MpM-I), microbasic p-mastigophore tipe II (MpM-II) dan microbasic b-mastigopore (MbM). Tipe MpM-I memiliki rata-rata panjang kapsul 182,10 µm, lebar kapsul 38,98 µm, dan panjang tangkai 76,45 µm; MpM-II memiliki rata-rata panjang kapsul 166,72 µm, lebar kapsul 41,60 µm, dan panjang tangkai 108,48 µm; serta MbM dengan panjang kapsul 154,84 µm dan lebar kapsul 30,96 µm. Komposisi nematositnya terdiri dari MpM-I 26,67 %, MpM-II 23,33 % dan MbM 50.00 %. Tipe MbM adalah nematosit yang dominan dalam spesies ini. Penelitian selanjutnya disarankan untuk meneliti perbandingan antara karakteristik nematosit dari S. subseriata dengan jenis karang lainnya dalam satu genus untuk mengetahui nematosit spesifik dari masing-masing jenis karang tersebut sehubungan dengan peran dari tipe-tipe nematosit spesifiknya. Kata kunci: Minahasa Utara, nematosit, Pesisir Bulutui, Scleractinia, Stylophora subseriata
The coastal region is the transitional area between the terrestrial and marine environment that has a great change of experiencing pressure due to pollution. This matter can caused by the strong population of Indonesia, quite high tourist activities, sea transportations, and large infra structure development. Marine debris in particular plastic is a big problem, not only in Indonesia, but also around the world. Hence, Indonesia is considered to be the second largest plastic waste producer in the world. Marine debris is part of a broader problem regarding waste management. Solid waste management has become a challenge for public health. In this research, garbage observation was done by adapting the shoreline survey method based on the national oceanic and atmospheric administration (NOAA, 2013). The results of observations of the research found that the type of macro-debris and meso-debris collected in the transect of observations were 228 items with a total weight of 2062.32 grams. Plastics debris were found in most quantities followed by rubbers, glasses and metals. The main factor for the abundance of marine debris in the coastal area of Tateli dua village Mandolang subdistrict Minahasa regency was the household waste, indicating that land-based sources provide a key factor for plastic pollution on the coastal area. Keywords: Marine debris, shoreline survey, pollution, coastal environment, Minahasa regency. AbstrakWilayah pesisir yang merupakan sumber daya potensial di Indonesia, adalah daerah peralihan antara daratan dan lautan. Sumber daya ini sangat besar yang didukung oleh adanya garis pantai sepanjang sekitar 81.000 km. Garis pantai yang panjang ini menyimpan potensi kekayaan sumber alam yang besar.Potensi itu diantaranya potensi non hayati dan hayati. Disamping potensi sumberdaya alam yang tersebar luas di pesisir Indonesia, potensi pencemaran terhadap lingkungan pesisir dan laut pun memiliki peluang yang cukup besar.Peluang ini dapat disebabkan oleh padatnya penduduk Indonesia, aktivitas wisata yang cukup tinggi termasuk transportasi, dan pembangunan yang besar.Sampah laut khususnya plastik merupakan masalah besar, bukan hanya di Indonesia, tetapi di seluruh dunia.Indonesia juga dianggap sebagai produsen sampah plastik ke laut terbesar kedua di dunia.Sampah laut merupakan bagian dari masalah yang lebih luas terkait pengelolaan sampah.Pengelolaan sampah padat telah menjadi tantangan kesehatan masyarakat.Pengamatan sampah dilakukan dengan adaptasi metode shoreline survey methodology berdasarkan National Oceanic and Atmospheric Administration(NOAA, 2013). Hasil pengamatan di lokasi penelitian di temukan jenis sampah makro-debris dan meso-debris yang dikumpulkan pada transek pengamatan sebanyak228 item dengan bobot total 2062,32 gram. Hasil penelitian menunjukkan bahwa plastik debris ditemukan dalam jumlah terbanyak diikuti oleh karet, kaca dan logam. Faktor utama penyebab kelimpahan sampah laut di Pantai Tumpaan Desa Tateli Dua, Kecamatan Mandolang, Kabupaten Minahasa adalah sampah aktivitas penduduk yang menunjukkan bahwa sumber-sumber berbasis lahan menyediakan input utama untuk polusi plastik di pantai tersebut. Kata Kunci: Sampah laut, survey garis pantai, pencemaran, lingkungan pesisir, Kabupaten Minahasa
Benthic fauna is a group of benthic organisms that live on the bottom of the water or the bottom of the sediment or between sediments. This study aims to obtain an overview of the distribution and types of benthic faunal organisms measuring > 1mm in the waters of Molas Village at a depth of 1-3 m, especially around coral fragments. Benthos sampling was carried out using a grab sampler with three repetitions. The benthic sediment sample was sieved using a 1000 m (1.0 mm) sieve. The sediment retained in the sieve was then identified based on its morphological characters using a stereo microscope. Furthermore, the number of organisms found was counted and analyzed according to the calculation of the ecological index. The results of the identification of benthic faunal organisms >1mm obtained a total of 36 types of mollusks consisting of 34 species belonging to the class Gastropods and 2 species belonging to the class Bivalvia which were divided into 24 families and obtained an average density of 81.4 ind/m2, Diversity Index 1, 47 (medium category), Uniformity Index 0.97 (high category) and Dominance Index 0.27 (nothing dominates).
Keywords: benthic ecology, grab sampling, Manado Bay
ABSTRAK
Fauna bentos merupakan kelompok organisme bentos yang hidup di dasar perairan atau dasar sedimen maupun di antara sedimen. Penelitian ini bertujuan untuk mendapatkan gambaran distribusi dan jenis organisme fauna bentos yang berukuran > 1mm di daerah perairan Kelurahan Molas padakedalaman 1-3 m khususnya di sekitar pecahan karang. Pengambilan sampel bentos dilakukan dengan menggunakan grab sampler dengan pengulangan sebanyak tiga kali. Sampel sedimen bentos diayak menggunakan saringan 1000 µm (1,0 mm). Sedimen yang tertahan di saringan kemudian diidentifikasi berdasarkan karakter morfologi dengan menggunakan bantuan mikroskop stereo. Selanjutnya jumlah organisme yang ditemukan dihitung dan dianalisis menurut perhitungan indeks ekologi.Hasil identifikasi organisme fauna bentos >1mm mendapatkan total 36 jenis moluska yang terdiri dari 34 spesies anggota kelas Gastropoda dan 2 spesies anggota kelas Bivalvia yang terbagi dalam 24 famili dan mendapatkan hasil rata-rata kepadatan 81,4 ind/m2, Indeks Keanekaragaman 1,47 (kategori sedang), Indeks Keseragaman 0,97 (kategori tinggi) dan Indeks Dominansi 0,27 (tergolong tidak ada yang mendominasi).
Kata Kunci: Ekologi bentos, grab sampling, Teluk Manado
The Likupang area, North Sulawesi is one of the super priority tourist destinations launched by the Central Government with the marine tourism sector as the axis. On the other hand, the potential for natural disasters originating from the sea is unavoidable so it needs to be one of the considerations in the process of developing disaster-responsive tourist areas. A tsunami hazard analysis study is first step in disaster mitigation planning. The study is in the form of tsunami modeling by identifying the worst possible scenario in the Likupang area using COMMIT modeling. The modeling is able to produce parameters such as arrival time, maximum height and tsunami inundation area. These three parameters are used as the basis for mapping the tsunami hazard map. The modeling produces the fastest arrival time, which occurs in the first minute after an earthquake occurs. The maximum height obtained from the modeling is 6.8 meters. The maximum inundation area reached by the tsunami wave is 23.57 km2. The combined results of the five scenarios are presented in hazard maps. The majority of public tourist sites are in the Warning status area, but some private resorts are still in the area with the Major Warning status.
Tanjung Pulisan area in Likupang has been designated as part of the Likupang Special Economic Zone (SEZ), as one of five super-priority tourist destinations. To support this program, it is urgent to have an assessment based on coral reef and fish ecology that can be destined as a tourism target. Thus, the purpose of this study is to provide information on the percentage of hard coral cover, the percentage of hard coral genera, as well as the density of reef fish in the waters of Tanjung Pulisan. The author uses the Line Intercept Transect and Underwater Visual Census methods at three stations which are combined synergistically to obtain data on corals and target reef fish effectively. Data were analyzed using the Microsoft Excel program. The results of the analysis showed that the percentage of live coral cover in Tanjung Pulisan waters was categorized as moderate with an average percentage of 47.04%, consisting of 30.28% hard coral and 16.76% soft coral. In these waters, 32 genera of hard corals were found, and Porites as the most dominant genus, with an average percentage of 23.01 %. In addition, the total average density of target reef fish in this location was 0.185 ind/m2, with the most dominant family being Acanthuridae with an average density value of 0.096 ind/m2.Keywords: Hard coral; Likupang; Reef fish; Tanjung PulisanAbstrakKawasan Tanjung Pulisan, Likupang telah ditetapkan menjadi bagian dari Kawasan Ekonomi Khusus (KEK) Likupang, satu dari lima destinasi wisata super prioritas. Guna menunjang program ini, perlu dilakukan analisis berbasis ekologi karang dan ikan karang yang bisa dijadikan sebagai target wisata. Berdasarkan ini maka dilakukan riset tutupan karang keras, persentase genera karang keras, juga kepadatan ikan karang di lokasi tersebut. Metode yang digunakan adalah Line Intercept Transect dan Sensus Visual Bawah Air pada tiga stasiun yang dipadukan secara sinergis untuk memperoleh data karang dan ikan karang target secara efektif. Data dianalisis menggunakan program Microsoft Excel. Hasil analisis menunjukan bahwa persentase tutupan karang hidup di perairan Tanjung Pulisan terkategorikan sedang dengan persentase rata-rata sebesar 47,04 %, yang terdiri dari 30,28 % karang keras dan 16,76 % karang lunak. Di perairan ini ditemukan 32 genera karang keras, dengan genus yang paling dominan yaitu Porites dengan persentase rata-rata sebesar 23,01 %. Selain itu, total kepadatan rata-rata ikan karang target di lokasi ini adalah 0,185 ind/m2, dengan Famili yang paling dominan adalah Acanthuridae dengan nilai kepadatan rata-rata sebesar 0,096 ind/m2.Kata kunci: Ikan karang; Karang keras; Likupang; Tanjung Pulisan
The research aimed to determine the recruitment density value of scleractinian coral juveniles in Tanjung Pisok (Meras and Bahowo) and Siladen Island. The method for selecting observation locations uses purposive sampling and collecting coral juvenile recruitment data using underwater photo transects. The results of this research obtained data on genus, size, and density values for coral juvenile recruitment. The coral genera found at Station I were 19 genera with the largest number being the Porites genus, 32 colonies, Station II 13 genera with the largest number being the Favites genus, 32 colonies, and at Station III 17 genera with the largest number being the Porites genus, 32 colonies. Coral juveniles in this study were more dominant in the 2 cm - 2.9 cm size group, for Station I 63 colonies, Station II 54 colonies and Station III 32 colonies. Based on the results of this research, it shows that the coral recruitment density at Station I with a value of 12.38 colonies/m² is higher than Station II, the coral recruitment density at Station II with a value of 12.23 colonies/m² is higher than Station III with a value of 7.21 colonies/m². Keywords: Recruitment; Scleractinia; Underwater Photo Transect; Bunaken National Park Abstrak Tujuan penelitian menentukan nilai densitas rekrutmen juvenil karang scleractinia di perairan Tanjung Pisok (Meras dan Bahowo) dan pulau Siladen. Metode pemilihan lokasi pengamatan menggunakan purposive sampling dan metode pengumpulan data rekrutmen juvenil karang menggunakan underwater photo transect. Hasil penelitian ini memperoleh data genus, ukuran dan nilai densitas rekrutmen juvenil karang. Genus karang yang didapat di Stasiun I yaitu 19 genus dengan yang terbanyak genus Porites 32 koloni, Stasiun II 13 genus dengan yang terbanyak genus Favites 32 koloni, dan Stasiun III 17 genus dengan yang terbanyak genus Porites 32 koloni. Juvenil karang dalam penelitian ini lebih dominan pada kelompok ukuran 2 cm - 2.9 cm, untuk Stasiun I 63 koloni, Stasiun II 54 koloni dan Stasiun III 32 koloni. Berdasarkan hasil penelitian ini menunjukkan densitas rekrutmen karang di Stasiun I dengan nilai 12,38 koloni/m² lebih tinggi dari Stasiun II, densitas rekrutmen karang di Stasiun II dengan nilai 12,23 koloni/m² lebih tinggi dari Stasiun III dengan nilai 7,21 koloni/m². Kata kunci: Rekrutmen; Scleractinia; Taman Nasional Bunaken; Underwater Photo Transect
Generally, this study was intended to examine the problems or implementation of turtle conservation in Talise, Gangga and Bangka Islands and specifically with a number of objectives to: know the introduction of sea turtle, to know sea turtle fishing and turtle exploitation, to know the knowledge of the people about turtle as a protected animal. Survey results on Talise Island, Gangga and Bangka showed that people who had seen turtles directly: Talise Island 94%, Gangga 58%, and Bangka 92%. Local residents of Talise, Gangga and Bangka Islands know well the turtles even see directly in their habitat and spawning time. In Talise, Gangga and Bangka Islands, turtles are still commonly caught, traded and consumed by local people. People's awareness about turtles as protected animals is lacking. Keywords: Turtle, Talise Island, Gangga and Bangka
The mangrove ecosystem area in the coastal area of Tatengesan Village, Pusomaen District, Southeast Minahasa Regency has been developed as a mangrove ecotourism area which has been managed by Village-Owned Enterprises (BUMD) since January 2019 with assistance from the Mandiri Rural National Community Empowerment Program (PNPM) team. The development of this mangrove ecotourism activity was stopped for a moment due to the impact of the COVID-19 pandemic, but currently, COVID-19 cases are considered endemic so this mangrove ecotourism activity will be developed again. This research aims to formulate some strategies for the sustainable use of the mangrove ecosystem on the Tatengesan coast, Southeast Minahasa Regency. This research lasted for 5 months, from September 2022 - February 2023. This research used descriptive qualitative methods with survey technique, i.e., in-depth direct interviews with resource persons (respondents). The formulation of priority strategies (key success factors) was analyzed using S.W.O.T and strategy choice analysis. This research produced 9 (nine) priority strategies as academic texts, which can be recommended to governments related to the marine and fisheries sector as elements of public policy-making officials. Keywords: Tatengesan village, mangrove ecotourism, sustainable use, priority strategies. Abstrak Kawasan ekosistem mangrove di wilayah pesisir Desa Tatengesan, Kecamatan Pusomaen, Kabupaten Minahasa Tenggara dikembangkan sebagai kawasan ekowisata mangrove yang dikelola oleh Badan Usaha Milik Desa (BUMD) sejak Januari 2019 dengan pendampingan oleh tim Program Nasional Pemberdayaan Masyarakat (PNPM) Mandiri Perdesaan. Kegiatan ekowisata mangrove ini pengembangannya terhenti sejenak dikarenakan adanya dampak pandemi Covid-19, namun saat ini kasus Covid-19 sudah dianggap endemi sehingga kegiatan ekowisata mangrove ini akan dikembangkan kembali. Tujuan penelitian ini yaitu merumuskan strategi pemanfaatan berkelanjutan ekosistem mangrove ke arah berkelanjutan di pesisir Tatengesan Kabupaten Minahasa Tenggara. Riset ini berlangsung selama 5 bulan, dari September 2022 - Februari 2023. Riset ini menggunakan metode kualitatif deskriptif dengan teknik survei, yaitu wawancara langsung secara mendalam (in-depth interview) kepada narasumber (responden). Perumusan strategi prioritas (faktor kunci keberhasilan) di analisis dengan menggunakan S.W.O.T dan analisis pilihan strategi. Penelitian ini menghasilkan 9 (sembilan) strategi prioritas sebagai naskah akademik, yang dapat direkomendasikan kepada pemerintah terkait pada sektor kelautan dan perikanan sebagai unsur pejabat pembuat kebijakan publik. Kata kunci: Desa Tatengesan, ekowisata mangrove, pemanfaatan berkelanjutan, strategi prioritas.
Terumbu karang adalah suatu ekosistem di laut dangkal tropis, di mana unsur penyusun utamanya karang batu, dengan berbagai biota lainnya yang hidup berasosiasi di dalamnya. Fenomena alam dan berbagai kegiatan antropogenik mengancam kesehatan maupun keberadaan terumbu karang. Pengambilan data dilakukan dengan metode UPT (Underwater Photo Transect) atau Transek Foto Bawah Air dilakukan dengan pemotretan bawah air menggunakan kamera digital yang diberi pelindung (housing). Analisis gambar dengan menggunakan piranti software CPCe (Coral Point Count with Excel extensions). Hasil penilaian kondisi kesehatan terumbu karang ditiga Stasiun di Pulau Salawati, tutupan terumbu karang di setiap Stasiun adalah sebagai berikut, Stasiun 1 55,13% termasuk dalam kategori baik, Stasiun 2 15,80% termasuk dalam kategori buruk, dan Stasiun 3 18,20% termasuk dalam kategoti buruk.
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