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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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PREDIKSI PASANG SURUT PERAIRAN SEKITAR KOTA BITUNG DENGAN PENAMBAHAN KONSTANTA HARMONIK PERAIRAN DANGKAL Tambunan, Citra; Rampengan, Royke; Pelle, Wilmy; Angmalisang, Ping; Tilaar, Sandra; Bara, Robert
JURNAL PESISIR DAN LAUT TROPIS Vol. 12 No. 3 (2024): JURNAL PESISIR DAN LAUT TROPIS
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jplt.12.3.2024.58042

Abstract

Bitung is a city with the most intensive marine space utilization activities in North Sulawesi Province. Therefore, information regarding oceanographic conditions is very important in relation to development in this city. One of the important information regarding oceanographic conditions is tides. This study was conducted with the aim of assessing the accuracy of tidal prediction with the addition of shallow water harmonic constituents and examining the amplitude fluctuations of the main harmonic component due to the addition of the shallow water constituents. The least squares method was used to calculate the amplitude and phase of tidal harmonic constituents, followed by data prediction. The data used is the measurement data of BMKG Bitung City tidal station in January, February and March 2024. The results obtained are the addition of shallow water harmonic constituents to the tidal analysis around Bitung City increases the accuracy of the prediction data. The best RMSE value for January data is 3.8323 cm; February 4.1902 cm; and March 4.2558 cm. The correlation coefficient increases and the percentage of predicted data with differences < 3 cm and < 6 cm with the observation data becomes larger. It is also found that when processing with few harmonic constituents, the amplitudes of constants M2, S2, K1, and O1 fluctuate. The addition of harmonic constituents in the analysis results in more constant amplitudes of constituents M2, S2, K1, and O1.
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
Co-Authors Adianse Tarigan Angkouw, Esther Angmalisang, Ping Calvyn F. A. Sondak, Calvyn F. A. Carolus Paulus Paruntu Deiske Adeliene Sumilat, Deiske Adeliene Durand, Swenekhe S. 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 Natalie D Rumampuk Olvie V. Kotambunan Pelle, Wilmy Pondaag, Kristy Sofia Rampengan, Royke 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 Tambunan, Citra Tindi, Monalisa Unstain N. W. J. Rembet, Unstain N. W. J. Victoria E.N. Manoppo, Victoria E.N.