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All Journal e-Journal BUDIDAYA PERAIRAN JURNAL PESISIR DAN LAUT TROPIS JURNAL ILMIAH PLATAX JURNAL PERIKANAN DAN KELAUTAN TROPIS
Alex D. Kambey
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Decision Sciences, Operations Research & Management Earth & Planetary Sciences Environmental Science

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Fish Community Structure Of The Bahu River Estuary Manado City: Sampe, Ayumi Angraini; Manu, Gaspar D.; Kambey, Alex D.; Pratasik, Silvester Benny; Rondonuwu, Arie B.; Rangan, Jety K.
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.v12i2.55275

Abstract

Community structure is an ecological term to indicate what organisms are present in a given environment, in what numbers, and how they are interconnected, through ecological indices that reflect dominance, evenness, and richness traits. The estuary is the most downstream part of the river and is connected to the sea. The Bahu River estuary is a habitat for a variety of aquatic life, especially fish, where water quality conditions greatly affect the abundance, diversity, and dominance. The methods used in this study were general field survey methods and fishing methods using the "swept area" method (Sparre & Venema, 1998). Data collection was carried out based on the time of collection using beach seine gear. This research was conducted with several stages, namely fishing in the field which will become data, data analysis and discussion. The results of this study indicate the composition of fish species in the Bahu River Estuary there are 11 families, 11 genus, and 14 species with a total of 86 individuals. The results of data analysis of the highest relative abundance in the Bahu River Estuary were in June, namely the Ambassis urotaenia species with a value of 45.90%. The results showed the community structure in the Bahu River Estuary in June and July (H' = 1.53 - 1.64, J' = 0.64 - 0.79, D = 0.31 - 0.26). Keywords: Diversity; Evenness; Dominance; River Estuary.
Community Structure of Macroalgae in the Coastal Waters of Tiwoho Village, Wori District, North Minahasa Regency Iyanleba, Jonathan Yohanes; Kepel, Rene Ch.; Tombokan, John Leonard; Kondoy, Khristin F. I.; Mandagi, Stephanus Vianny; Kambey, Alex D.
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.v13i1.60693

Abstract

The purpose of this study is to describe the morphology and anatomy of each macroalgae species and to analyze the community structure of macroalgae from the study location. Data collection was carried out using the Line Transect method with quadrat sampling techniques conducted at the lowest tide. Temperature measurement was done using a thermometer and salinity using a refractometer, while substrate determination was visually assessed based on the type of substrate. The results of this study found 7 species, consisting of 1 species of red algae, 4 species of brown algae, and 2 species of green algae. The morphology of these algae types varies with different anatomies based on cross and longitudinal sections of each part of the algal thallus. The highest species density was Turbinaria ornata (transect 1), while the lowest density was Halimeda opuntia and Sargassum polycystum (transect 1), Turbinaria ornata (transect 2 and transect 3). The macroalgae diversity index values on the three transects were in the medium category. The species evenness index values on the three transects were stable. The species richness index values on the three transects were in the low category. The dominance index values on the three transects were in the low category. Keywords: Macroalgae, Community, Transect, Quadrat, Tiwoho. Abstrak Tujuan penelitian ini adalah mendeskripsikan morfologi dan anatomi masing-masing spesies makroalga, dan menganalisis stuktur komunitas makroalga dari lokasi penelitian. Pengambilan data menggunakan metode Line Transect dengan teknik sampling kuadrat yang dilakukan pada saat surut terendah. Pengukuran suhu menggunakan Termometer dan salinitas menggunakan Refraktometer, dan untuk penentuan substrat dilihat secara visual jenis dari substrat tersebut. Hasil penelitian ini ditemukan 7 spesies yang terdiri dari 1 spesies alga merah, 4 spesies alga coklat dan 2 spesies alga hijau. Morfologi jenis-jenis alga tersebut beragam dengan anatomi yang berbeda berdasarkan potongan melintang dan memanjang dari masing-masing bagian thallus alga. Kepadatan spesies tertinggi yaitu Turbinaria ornata (transek 1) sedangkan kepadatan terendah yaitu Halimeda opuntia dan Sargassum polycystum (transek 1), Turbinaria ornata (transek 2 dan transek 3). Nilai indeks keanekaragaman makroalga pada ketiga transek termasuk dalam kategori sedang. Nilai indeks kemerataan jenis pada ketiga transek termasuk dalam keadaan stabil. Nilai indeks kekayaan jenis pada ketiga transek termasuk dalam kategori rendah. Nilai indeks dominasi pada ketiga transek termasuk dalam kategori rendah. Kata kunci: Makroalga, Komunitas, Transek, Kuadrat, Tiwoho.
Co-Authors Adnan S. Wantasen Adnan Wantasen Alinaung F. Firgonitha Alvira Y. Bulahari Anneke V. Lohoo Ari B. Rondonuwu Ari Rondonuwu Bataragoa, M.Sc, Dr. Ir. Nego E. Bataragoa, Nego Elvis Calvyn F. A. Sondak, Calvyn F. A. Cornelis Dimas Bugaleng Daryanto, Adityas Andrew Dei, Katrin Dowena Farnis B. Boneka Ferdinand Frans Tilaar Feybe H. A Zachawerus Fransine B. Manginsela Gaspar D. Manu, Gaspar D. Gaspar Manu Henneke Pangkey Hermanto Manengkey Indri Manembu Iyanleba, Jonathan Yohanes Janny D. Kusen Jety K. Rangan Jhonly Solang John L. Tombokan Joudy R.R. Sangari Juliaan Ch. Watung Kepel, Rene Ch. Khristin I. F. Kondoy, Khristin I. F. Kindangen, Rezky G. T. L Kondoy, Khristin F. I. Kondoy, Khristin I.F. Kreckhoff, Reni L. Kristianto Parera, Kristianto Kurnia Tolule, Kurnia Lalamentik, Laurentius Th. X. Laura, Azhar Lawrence J. L. Lumingas Leleran, Andreas J. P. L. Losu, Anggun Mamangkey, Noldy G.F Mandagi, Stephanus Mandagi, Stephanus V. Mandagi, Stephanus Vianny Manginsela, Fransine Mantiri, Rose O.S.E. Melda F. Aralaha Menajang, Febry S. I. Opa, Esri T. Pitoy, Israel Pratasik, Silvester B. Pratasik, Silvester Benny Pratiwi, Utary Rangan, Jety Rangan, Jety K. Ratih, Mutiara Rene Charles Kepel, Rene Charles Ridwan Lasabuda Rignolda Djamaluddin Rondonuwu, Arie B. Rose O. S. E. Mantiri Rose O. S. E. Mantiri, Rose O. S. E. Royke M. Rampengan Ruddy Dj. Moningkey Runturambi, Melinda Salaki, Meiske S. Salaki, Meiske Sofie Sambali, Haryani Sampe, Ayumi Angraini Sangari, Joudy Sangari, Joudy R. R. Sanggaria, Ayu W. Sapsuha, Jufran Sheyrel Tongkeles Sinjal, Cathrien A. L Situmorang, Ezra Monika Suzanne L Undap Tamsir, Chika Litawaty Tombokan, John Leonard Tumbel, Stivensian M. Turangan, Septiara Unstain N. W. J. Rembet, Unstain N. W. J. Unstain N.W.J. Rembet Yuneke Kansil