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All Journal AQUATIC SCIENCE & MANAGEMENT e-Journal BUDIDAYA PERAIRAN JURNAL PESISIR DAN LAUT TROPIS JURNAL ILMIAH PLATAX JURNAL PERIKANAN DAN KELAUTAN TROPIS JURNAL LPPM BIDANG SAINS DAN TEKNOLOGI Briliant: Jurnal Riset dan Konseptual
Veibe Warouw
Fakultas Perikanan dan Ilmu Kelautan, Universitas Sam Ratulangi, Manado, Sulawesi Utara
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Environmental Science

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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 Alfret Luasunaung Angkouw, Esther Dellayani Angmalisang, Ping Astony Antonius Rumengan Ari Berty Rondonuwu Boneka, Farnis B. Boneka Boneka, Farnis Bineada Calvyn F. A. Sondak, Calvyn F. A. Carolus Paulus Paruntu Cyska Lumenta Darus S. Paransa Deiske Adeliene Sumilat, Deiske Adeliene Elvy L Ginting Farnis B. Boneka Fitje F. Losung, Fitje F. Fitje Losung Frangky E. Kaparang Ginting, Elvy Like Henky Manoppo Henneke Pangkey Hidayat, Andre Alfian Indri Manembu Janny D. Kusen Johnny Budiman Joice R.T.S.L Rimper Joshian N.W. Schaduw Kalebos, Roosa C. Kaligis, Erly Yosef Kreckhoff, Reni L. Kumampung, Deislie R.H. Kusumaningrum, Arianda Lasut , Markus Lasut, Astrid Y. Lindon R Pane Lintang, Rosita A.J. Lumingas, Lawrence L.J. Mahmud, Maudy Rusmini Mamangkey, Noldy Gustaf Frans Mamuaja, Jane M. Mangangkung, Nazarrian Mangindaan, Remy Mangindaan, Remy Emile Petrus Manoppo, Lefran Mantiri, Desy M. H Maramis, Regina U. Markus T. Lasut Medy Ompi Mokolensang, Jeffrie Mokolensang, Jeffrie F. Mokosuli, Febrianty Dhea Molle, Ben Arther Monijung, Revol Dulles Natalie D Rumampuk Ngangi, Edwin Leonardo Apolonio Nowin, Edgar Ockstan J. Kalesaran Ockstan Kalesaran Pane, Lindon R. Pangalila, Novelia M.A. Pangkey, Henneke D. Paransa, Darus Sa'adah Paransa, Darus Sa'adah Johanis Paransa, Darus Sa’adah Johanis Paulus, James Pesoth, Christianto R. T. D. Maramis Ramadan, Febrian Reiny A. Tumbol Rimper, Abraham M. Rimper, Joice R. T. S. L . Rizal W Suleman Robert A. Bara Roeroe, Kakaskasen Andreas Rose O. S. E. Mantiri, Rose O. S. E. Rumampuk, Natalie D.C Rumampuk, Natalie Detty Rumampuk, Natalie Detty C Rumampuk, Natalie Detty C. Rumengan, Inneke Fenny Salaki, Christina Leta Salaki, Meiske S. Salawati, Vellysa Friendly Sangari, Joudy Saragih, Hans S. R. P. Sembiring, Sindiy Cloudya Silvana Dinaintang Harikedua Silvester B Pratasik Sirri, Yolanda Stenly Wullur sukmawati Sumual, Sarah S. Sundah, Geraldo Thimoty Tuliabu, Nelda Tuyu, Adel M. Undap, Suzanne J Undap, Suzanne Lydia Uniplaita, Dominique Wilhelmina Patty Wilmy E Pelle