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All Journal AKULTURASI (JURNAL ILMIAH AGROBISNIS PERIKANAN) JURNAL PESISIR DAN LAUT TROPIS JURNAL ILMIAH PLATAX JURNAL PERIKANAN DAN KELAUTAN TROPIS BULETIN OSEANOGRAFI MARINA JURNAL LPPM BIDANG SAINS DAN TEKNOLOGI
Sandra Tilaar
Fakultas Perikanan Dan Ilmu Kelautan, Universitas Sam Ratulangi, Manado, Sulawesi Utara
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Environmental Science

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Phylogenetic Relationships of Isognomon (Lightfoot, 1786) Oysters from North Sulawesi, Indonesia Wullur, Stenly; Rumampuk, Natalie Detty; Tilaar, Sandra Olivia; Tindi, Monalisa; Smolak, Radoslav
Buletin Oseanografi Marina Vol 13, No 1 (2024): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v13i1.54740

Abstract

The Isognomon (Lightfoot, 1786) is a genus of oysters found in various coastal ecosystems throughout the world. Along with other bivalves, it performs significant ecological functions in marine ecosystems by providing food and habitat for fish and invertebrate habitats, filtering water, and protecting shorelines. Taxonomic classification of the Isognomon oyster can be challenging due to the varied or cryptic phenotypic characters, particularly shell characters.  In this study, two specimens with different shell characters of Isognomon oyster were collected from mangrove waters in Likupang, North Sulawesi, Indonesia, and subjected to molecular analysis to determine their identity.  The mitochondrial cytochrome C oxidase subunit I (COI) gene was utilized as a primer for this purpose, and the genetic distance and phylogenetic position of the two specimens were determined by comparing them with the GenBank database. The Basic Local Alignment Search Tool (BLAST) revealed that the two specimens were of belonged to Isognomon ephippium, with a similarity of 99.84%. The genetic distance between the two specimens was calculated using the Tamura Nei model and found to be 0.00, while the genetic distance between I. ephippium and other species in the Isognomon genus ranged from 0.00 to 0.14. The results of the Neighbor Joining (NJ) tree analyses showed that the two specimens clustered together with I. ephippium, which was divided into two distinct clades with a strong bootstrap value of 100 at the node
Condition of Seagrass Meadows in The Waters Around The Sunrise Tourist Area, Makalisung Village, Kombi District, Minahasa Regency Baso, Fathan; Wagey, Billy T.; Sondak, Calvyn F. A.; Ginting, Elvy L.; Tilaar, Sandra O.; Rampengan, Royke M.
JURNAL PESISIR DAN LAUT TROPIS Vol. 14 No. 1 (2026): JURNAL PESISIR DAN LAUT TROPIS
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jplt.14.1.2026.65793

Abstract

Seagrass is a flowering plant (magnoliopyta). Seagrass requires a minimum light intensity of $11% - 25%$ for photosynthesis, and disturbances can reduce the availability of light. Research in the Sunrise Tourism Area, Makalisung Village, aims to identify the types and conditions of seagrass meadows, considering the pressure from human activities such as garbage disposal and fishing boat traffic. The data collection method uses quadrant transects with three 100-meter transects, each placed in 11 quadrants. The results of the study successfully identified 7 types of seagrass, including Cymodocea rotundata, Enhalus acoroides, Halophila ovalis, Halodule pinifolia, Halodule uninervis, Syringodium isoetifolium, and Thalassia hemprichii. Based on calculations, the average percentage of seagrass cover is 57.68% and can be categorized as dense. However, although the cover is classified as dense, Meanwhile, according to the Ministry of Environment Decree No. 200/2004, the determination of the closure of seagrass meadow conditions can be categorized as less rich/less healthy. This indicates the potential for environmental problems that can affect the health of the seagrass ecosystem at Sunrise Beach. Keywords: seagrass condition, Sunrise Beach, coastal waters, seagrass cover Abstrak Lamun (seagrass) merupakan tumbuhan berbunga (magnoliopyta). Lamun memerlukan intensitas cahaya minimal $11% - 25%$ untuk fotosintesis, dan gangguan tersebut dapat mengurangi ketersediaan cahaya. Penelitian di Kawasan Wisata Sunrise, Desa Makalisung, bertujuan mengidentifikasi jenis dan kondisi padang lamun, mengingat adanya tekanan dari aktivitas manusia seperti pembuangan sampah dan lalu lintas perahu nelayan. Metode pengambilan data menggunakan transek kuadran dengan tiga transek sepanjang  100 meter, masing- masing diletakkan 11 kuadran. Hasil penelitian berhasil mengidentifikasi 7 jenis lamun, termasuk Cymodocea rotundata, Enhalus acoroides, Halophila ovalis, Halodule pinifolia, Halodule uninervis, Syringodium isoetifolium, dan Thalassia hemprichii.Berdasarkan perhitungan, rata-rata persentase tutupan lamun adalah 57,68% dan dapat dikategorikan padat.Namun, meskipun tutupan tergolong padat, Sedangkan menurut KEPMEN KLH No 200/2004, penentuan penutupan kondisi padang lamun dapat dikategorikan dalam kategori kurang kaya/kurang sehat. Hal ini menunjukkan adanya potensi masalah lingkungan yang dapat memengaruhi kesehatan ekosistem lamun di Pantai Sunrise. Kata kunci: kondisi lamun, Pantai Sunrise, perairan pesisir, tutupan lamun
Ecological Analysis of Megabenthos in Coral Reef Ecosystems of The Waters Surrounding Bahoi Village, North Minahasa Regency Grathia Charity; Manembu, Indri S.; Mamangkey, N. Gustaf F.; Rumengan, Antonius P.; Boneka, Farnis B.; Tilaar, Sandra O.
JURNAL PESISIR DAN LAUT TROPIS Vol. 14 No. 1 (2026): JURNAL PESISIR DAN LAUT TROPIS
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jplt.14.1.2026.65927

Abstract

Megabenthos are a group of organisms larger than 1 cm that inhabit the seafloor and are sensitive to environmental changes. Information regarding megabenthos in Bahoi Village has not yet been published; therefore, this study was conducted to fill the data gap related to benthic community structure in the area. Data were collected at three stations representing different levels of ecological pressure using the Benthos Belt Transect  method, with a transect length of 70 m and an observation width of 2 m, resulting in a total surveyed area of 140 m² per station. Target megabenthos recorded included Diadema spp., Linckia laevigata, Tridacninae, and Drupella cornus. Based on the analysis, Station 1 (near settlement and non-MPA) showed densities of Diadema spp. of 2.11 ind/m², Linckia laevigata of 0.04 ind/m², Tridacninae of 0.03 ind/m², and Drupella cornus of 0.07 ind/m², with H’ = 0.29, C = 0.88, and E = 0.2. Station 2 (MPA) recorded densities of Diadema spp. of 0.007 ind/m², Linckia laevigata of 0.029 ind/m², Tridacninae of 0.014 ind/m², and Drupella cornus of 0.014 ind/m², with H’ = 1.27, C = 0.30, and E = 0.9. Station 3 (far from settlement and non-MPA) showed densities of Linckia laevigata of 0.19 ind/m² and Diadema spp. of 0.07 ind/m², with H’ = 0.58, C = 0.61, and E = 0.8. The patterns of ecological indices indicate a strong relationship between the intensity of human intervention and habitat characteristics in determining the stability of megabenthic communities. Keywords: megabenthos, coral reefs, community, benthos belt transect, Bahoi Village   Abstrak Megabentos merupakan kelompok organisme yang hidup di dasar laut dan berukuran lebih dari 1 cm yang sensitif terhadap perubahan lingkungan. Informasi mengenai megabentos di Desa Bahoi hingga kini belum dipublikasikan sehingga penelitian ini dilakukan untuk mengisi kesenjangan data terkait struktur komunitas bentik di wilayah tersebut. Pengumpulan data dilakukan pada tiga stasiun yang mewakili perbedaan tingkat tekanan ekologis menggunakan metode Benthos Belt Transect sepanjang 70 m dengan lebar pengamatan 2 m sehingga total area pengamatan 140 m² per stasiun. Megabentos target yang ditemukan meliputi Diadema spp., Linckia laevigata, Tridacninae, dan Drupella cornus. Berdasarkan analisis data, Stasiun 1 (dekat permukiman & non-DPL) memiliki kepadatan Diadema spp. sebesar 2,11 ind/m², Linckia laevigata sebesar 0,04 ind/m², Tridacninae sebesar 0,03 ind/m² dan Drupella cornus sebesar 0,07 ind/m² dengan H’=0,29, C=0,88, dan E=0,2. Stasiun 2 (DPL) memiliki kepadatan Diadema spp. sebesar 0,007 ind/m², Linckia laevigata sebesar 0,029 ind/m², Tridacninae sebesar 0,014 ind/m² dan Drupella cornus sebesar 0,014 ind/m² dengan H’=1,27, C=0,3 dan E=0,9. Stasiun 3 (jauh dari permukiman & non-DPL) memiliki kepadatan Linckia laevigata sebesar 0,19 ind/m² serta Diadema spp. sebesar 0,07 ind/m² dengan H’=0,58, C=0,61 dan E=0,8. Pola indeks ekologi menunjukkan hubungan kuat antara tingkat tekanan intervensi manusia dan karakteristik habitat terhadap stabilitas komunitas megabentos. Kata kunci: megabentos, terumbu karang, komunitas, benthos belt transect, Desa Bahoi
Co-Authors Adianse Tarigan Angkouw, Esther Antonius P. Rumengan Baso, Fathan Billy Theodorus Wagey Calvyn F. A. Sondak, Calvyn F. A. Carolus Paulus Paruntu Deiske Adeliene Sumilat, Deiske Adeliene Durand, Swenekhe S. Elvy L. Ginting, Elvy L. Farnis B. Boneka Grathia Charity Grevo S Gerung Indri Manembu Joshian N.W. Schaduw Kreckhoff, Reny L. Kunsiang, Andriano Lasut, Nicole Theresa Lexy K. Rarung Mamangkey, Noldy G.F Mantiri, Desy M. H Markus T. Lasut Martha P. Wasak N. Gustaf F. Mamangkey Natalie D Rumampuk Olvie V. Kotambunan Pelle, Wilmy Pondaag, Kristy Sofia Robert A. Bara Roeroe, Kakaskasen Andreas Roeroe, Wailan Royke M. Rampengan Rumampuk, Irine Rumampuk, Natalie Detty Sanadi, Troy Sinjal, Chatrien A. L. Sinjal, Chatrien Annita Siti Suhaeni, Siti Smolak, Radoslav Sondakh, Srie J. Stenly Wullur Tindi, Monalisa Unstain N. W. J. Rembet, Unstain N. W. J. Victoria E. N. Manoppo