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All Journal Forum Pasca Sarjana AQUATIC SCIENCE & MANAGEMENT e-Journal BUDIDAYA PERAIRAN JURNAL PESISIR DAN LAUT TROPIS JURNAL ILMIAH PLATAX KESMAS JURNAL PERIKANAN DAN KELAUTAN TROPIS Biota: Jurnal Ilmiah Ilmu-Ilmu Hayati JURNAL LPPM BIDANG SAINS DAN TEKNOLOGI Marine Research in Indonesia
Joice R.T.S.L Rimper
Program Studi Ilmu Kelautan, Fakultas Perikanan Dan Ilmu Kelautan Universitas Sam Ratulangi Manado
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Environmental Science Health Professions Public Health

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Phytoplankton Community Structure in Seagrass Beds of Nain Island Waters Mokosuli, Febrianty Dhea; Rimper, Joice R.T.S.L; Warouw, Veibe; Wullur, Stenly; Losung, Fitje; Mokolensang, Jeffrie F.
Jurnal Ilmiah Platax Vol. 12 No. 1 (2024): ISSUE JANUARY-JUNE 2024
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v12i1.52339

Abstract

This study aims to identify phytoplankton species, calculate phytoplankton abundance, diversity index, uniformity index, phytoplankton dominance index, and determine environmental conditions such as temperature, pH, salinity, nitrate, and phosphate in the seagrass ecosystem of Nain Island Waters. Sampling includes seawater for the needs of phytoplankton identification measurement of nitrate and phosphate levels and measurement of water parameters in situ. Phytoplankton sampling is done horizontally using a plankton net. Phytoplankton identification found in the seagrass ecosystem of Nain Island Waters consisted of four classes, namely Bacillariophyceae (Rhizosolenia sp.; Nitzschia sp.; Chaetoceros sp.; Navicula sp.; Eucampi sp.; Pleurosigma sp.; Thalassionema sp.; Melosira sp.), Dinophyceae (Ceratium sp.; Protoperidinium sp.), Chlorophyceae (Spirogyra sp.), and Euglenophyceae (Euglena sp.). The calculation of phytoplankton abundance is in the range of 9 - 51 cells/l. The highest abundance was found at station one which was 51 cells/l, then station three which was 21 cells/l, and station two which was 9 cells//I. The diversity index is in the range of 0.8749 - 1.8668 which means there is community instability. The uniformity index is in the range of 0.2226 - 0.8460, while the dominance index is in the range of 0.2060 - 0.6093, this indicates that the water conditions are stable. Environmental conditions (temperature, salinity, pH, nitrate, and phosphate) in the seagrass ecosystem of Nain Island Waters are still quite good for phytoplankton growth. Keywords: Phytoplankton, Seagrass, Nain Island, Abundance, Biological Index Abstrak Penelitian ini bertujuan untuk identifikasi jenis-jenis fitoplankton, menghitung kelimpahan fitoplankton, indeks keanekaragaman, indeks keseragaman, indeks dominasi fitoplankton dan mengetahui kondisi lingkungan seperti suhu, pH, salinitas, nitrat, dan fosfat di ekosistem padang lamun Perairan Pulau Nain. Pengambilan sampel meliputi air laut untuk kebutuhan identifikasi fitoplankton dan pengukuran kadar nitrat dan fosfat perairan serta pengukuran parameter perairan secara In situ. Pengambilan sampel fitoplankton dilakukan secara horizontal dengan menggunakan plankton net. Fitoplankton yang ditemukan terdiri dari empat kelas yaitu Bacillariophyceae (Rhizosolenia sp. Nitzschia sp. Chaetoceros sp. Navicula sp. Eucampi sp. Pleurosigma sp. Thalassionema sp. Thalassionema sp. Melosira sp.), Dinophyceae (Ceratium sp. Protoperidinium sp.), Chlorophyceae (Spirogyra sp), dan Euglenophyceae (Euglena sp). Hasil perhitungan kelimpahan fitoplankton berada di kisaran 9 - 51 sel/l. Kelimpahan tertinggi ditemukan pada stasiun satu yaitu 51 sel/l, kemudian stasiun tiga yaitu 21 sel/l dan stasiun dua yaitu 9 sel/I. Indeks keanekaragaman berada pada kisaran 0,8749 - 1,8668 yang berarti adanya ketidakstabilan komunitas. Indeks keseragaman yaitu pada kisaran 0,2226 - 0,8460, sedangkan indeks dominasi berada pada kisaran 0,2060 - 0,6093, hal ini menunjukkan kondisi perairan dalam keadaan stabil. Kondisi lingkungan (suhu, salinitas, pH, nitrat dan fosfat) di ekosistem padang lamun Perairan Pulau Nain masih cukup baik untuk pertumbuhan fitoplankton. Kata kunci: Fitoplankton, Padang Lamun, Pulau Nain, Kelimpahan, Indeks Biologi
Spatial And Temporal Analysis Of Sea Surface Temperature Variability And Chlorophyll-A Over Two Decades In North Sulawesi Waters Buana, Muhammad Candra; Patty, Wilhelmina; Mantiri, Rose O. S. E.; Budiman, Johnny; Rimper, Joice R.T.S.L.; Rangan, Jety K.; Sumilat, Deiske Adeliene
Jurnal Ilmiah Platax Vol. 12 No. 2 (2024): ISSUE JULY-DECEMBER 2024
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v12i2.55621

Abstract

Sulawesi waters are directly affected by the dynamics that occur in the Pacific Ocean. The ENSO phenomenon that occurs in the Pacific Ocean can also be felt in the waters of the Sulawesi Sea. The dynamics of oceanographic parameters can cause climate change. The extreme impact of climate change is mainly the occurrence of rising temperatures and seasonal shifts. The purpose of this study is to analyze the variability of spatial and temporal anomalous distribution of sea surface temperature and chlorophyll-a. This study used monthly AQUA Modis image data, conducted by analyzing the spatial and temporal distribution of sea surface temperatures during the two decades of the period 2003 - 2022. This analysis is based on abnormal values obtained from subtracting parameter values from historical values (the average value of all data). The results of spatial variability analysis of sea surface temperature and chlorophyll –show anomalous variations occur in the western and transitional season periods I, while in the eastern season and transition II positive anomalous values dominate the eastern waters negative anomalies dominate the western waters opposite to chlorophyll – a. This study showed that there was an increase in sea surface temperature slope by 0.000840C / year while in chlorophyll - a there was a decrease in slope by 0.00072mg / m3 / year. Keywords: Spatial, Temporal, SPL, Chlorophyll – a, Climate Change. Abstrak Perairan Sulawesi mendapatkan pengaruh secara langsung dari dinamika yang terjadi di Samudera Pasifik. Fenomena ENSO yang terjadi di Samudera Pasifik juga dapat dirasakan dampaknya di perairan Laut Sulawesi. Dinamika parameter oseanografi dapat menyebabkan terjadinya perubahan iklim. Dampak ekstrem dari perubahan iklim terutama adalah terjadinya kenaikan temperatur serta pergeseran musim. Tujuan penelitian ini Menganalisis Variabilitas distribusi anomali spasial dan temporal dari suhu permukaan laut dan klorofil – a, Penelitian ini menggunakan data citra AQUA Modis bulanan, dilakukan dengan menganalisis sebaran spasial dan temporal suhu permukaan laut selama dua dekade periode 2003 - 2022. Analisa ini didasarkan pada nilai anomali yang didapat dari pengurangan nilai parameter dengan nilai historis (rerata nilai seluruh data). Hasil analisis variabilitas spasial suhu permukaan laut dan klorofil – a menunjukan variasi anomali terjadi pada periode musim barat dan peralihan I , sedangkan pada musim timur dan peralihan II nilai anomali positif mendominasi perairan sebelah timur anomali negatif mendominasi perairan sebelah barat sebaliknya dengan klorofil – a. Penelitian ini menunjukan bahwa terjadi peningkatan slope suhu permukaan laut sebesar 0,000840C/ tahun sedangkan pada klorofil - a terjadi penurunan slope sebesar 0,00072mg/m3/tahun. Kata kunci: Spasial, Temporal, SPL, Klorofil – a, Perubahan Iklim.
Study of Scleractinian Coral Recruitment in the Waters of Tanjung Pisok and Siladen Island, Bunaken National Park Lenak, Maria Magdalena; Roeroe, Kakaskasen; Paruntu, Carolus; Mangindaan, Remy; Manembu, Indri; Rimper, Joice
Jurnal Ilmiah Platax Vol. 13 No. 1 (2025): ISSUE JANUARY-JUNE 2025
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v13i1.58540

Abstract

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
First record of semi-aquatic bugs (Hemiptera: Veliidae) from Tasik Ria coastal waters, North Sulawesi, Indonesia Warouw, Veibe; Rimper, Joice R.T.S.L; Harikedua, Silvana Dinaintang; Manembu, Indri Shelovita; Rumampuk, Natalie Detty
AQUATIC SCIENCE & MANAGEMENT Vol. 13 No. 2 (2025): OCTOBER
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jasm.v13i2.66637

Abstract

Semi-aquatic bugs of the family Veliidae (Hemiptera: Heteroptera: Gerromorpha) are primarily associated with freshwater habitats; their occurrence in coastal environments remains poorly documented, particularly in tropical regions. This study reports the first record of Veliidae from the coastal waters of Tasik Ria Beach, North Sulawesi, Indonesia, thereby expanding the known ecological distribution of this family. Specimens were collected from surface-water microhabitats using a sweep net, and key environmental parameters were measured in situ. Morphological identification was based on stereomicroscopic examination of diagnostic characters. Molecular confirmation was obtained through DNA barcoding of the mitochondrial cytochrome c oxidase subunit I (COI) gene, with sequences compared against the GenBank and BOLD databases. Both morphological and molecular analyses confirmed the specimens' taxonomic placement within Veliidae. Their presence in a coastal habitat indicates greater ecological plasticity and habitat tolerance than previously recognized. This finding establishes important baseline data for future research on the distribution, bioecology, and adaptive strategies of semi-aquatic insects in tropical coastal ecosystems.
Spatial variation of microplastic abundance and types in Bitung coastal waters, North Sulawesi: influence of fishing, residential, and port activities Rimper, Joice; Warouw, Veibe; Sangari, Joudy; Uniplaita, Dominique; Lasut , Markus
AQUATIC SCIENCE & MANAGEMENT Vol. 13 No. 2 (2025): OCTOBER
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jasm.v13i2.66650

Abstract

Microplastic contamination in coastal waters is shaped by local human activities and hydrodynamic transport, yet spatially explicit evidence from many Indonesian coastal cities remains limited. This study assessed the spatial variation of microplastic abundance and morphological types in Bitung coastal waters, North Sulawesi, across three stations representing contrasting coastal activity zones: fishing area (Station 1), residential area (Station 2), and port area (Station 3). Surface-water samples were collected in July 2025 using horizontal plankton-net tows over a 10 m transect, with three replicates per station. Laboratory processing included sequential sieving (0.4 mm and 5 mm), oven drying (90°C, 24 h), wet peroxide oxidation (WPO) with fenton reagent, NaCl density separation, and filtration (Whatman 100–250 µm), followed by microscopic classification into fiber, fragment, pellet, film, and foam types. A total of 488 microplastic particles were recorded across all samples. The port station showed the highest abundance (320 particles, mean 106.7 ± 10.2 particles per tow), substantially exceeding fishing (92 particles, 30.7 ± 6.4) and residential (76 particles, 25.3 ± 9.5) stations. Overall composition was dominated by fragments (41.8%) and fibers (35.7%). Type composition differed significantly among stations, with fragments strongly dominating the port station, whereas fibers dominated the fishing and residential stations. These patterns indicate distinct local sources (e.g., shipping/port operations and packaging debris vs. textiles and fishing gear), highlighting the need for targeted waste control and monitoring in Bitung’s coastal zones.
Co-Authors Adnan Wantasen Ali Djamhuri Asy'ari, Asy'ari Buana, Muhammad Candra Carolus Paulus Paruntu Deiske Adeliene Sumilat, Deiske Adeliene Edwin D Ngangi Erly Kaligis F. Losung, F. Fajar Vafry Fitje Losung Fransine B. Manginsela Henneke Pangkey Hety B Lahope Indri Manembu Inneke F. M Rumengan Janny D. Kusen Johnny Budiman Julia L. Kalalo Julius Sampekalo Kaligis, Erly Yosef Kudato, Vania E. Kurniati Kemer Lasut , Markus Lenak, Maria Magdalena Lintang, Rosita A.J. Mandagi, Stephanus V. Mangindaan, Remy Mantiri, Desy M. H Medy Ompi Mokolensang, Jeffrie F. Mokosuli, Febrianty Dhea Muhamad Shabir Usman N. D. Rumampuk, N. D. Nawangsari Sugiri Ngangi, Edwin Leonardo Apolonio Nowin, Edgar Oddi R Pinontoan Pangkey, Henneke D. Paulus, James Pesoth, Christianto Petrus P Letsoin Rangan, Jety K. Richardus F. Kaswadji RICHARDUS KASWADJI Rimper, Abraham M. Roeroe, Kakaskasen Andreas Rose O. S. E. Mantiri, Rose O. S. E. Rumampuk, N.D. Rumampuk, Natalie Detty Rumampuk, Natalie Detty C Sahari, Jefri Sambali, Hariyani Sammy N. J. Longdong Sangande, John B. Sangari, Joudy Silvana Dinaintang Harikedua Stenly Wullur Tilaar, Ferdinand F. Tuliabu, Nelda Uniplaita, Dominique Veibe Warouw Wilhelmina Patty