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INDONESIA
JURNAL ILMIAH PLATAX
Published by Universitas Sam Ratulangi
ISSN : 23023589     EISSN : -     DOI : -
Core Subject : Social,
Environmental Science
Mencakup Penulisan yang berhubungan dengan pelaksanaan penelitian yang dilakukan secara mandiri, atau kelompok, dan berdasarkan Ruang Lingkup Pengelolaan Wilayah Pesisir, Konservasi, Ekowisata, dan Keanekaragaman Hayati Perairan.
Arjuna Subject : -
Articles 35 Documents
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Cell Density Of Microalgae Tetraselmis chuii, With Lead Acetate Compound (Pb(Ch3COO)2) at Different Concentrations Kadang, Nurfadillah; Kemer, Kurniati; Mantiri, Desy Maria Helena; Kaligis, Erly Y.; Rumampuk, Natalie D.C.; Pelle, Wilmy Etwil
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.v12i2.49957

Abstract

Microalgae are a group of microscopic plants, included in the algae class, with a diameter of between 3-30 µm, single cells, and colonies that can live in all areas of fresh water and seawater. Microalgae contain active components that can be used in the cosmetic, food, pharmaceutical, and nutraceutical industries. This study aimed to determine the density of marine microalgae Tetraselmis chuii cells in culture media before treatment and to determine the density of T.chuii microalgae cells by administering lead acetate compounds at different concentrations. The method used in this study was culturing marine microalgae cells in balanced containers with lead acetate administration at concentrations of 30 ppm, 50 ppm, and 70 ppm, then observations were made by counting the number of cells under an Olympus microscope with 10x magnification using a hemocytometer. Observations were made every day at the same hour until the death phase. Microalgae culture uses a Light Emitting Diode (LED) lamp with 6,840 lux lighting. The results showed that the growth of T.chuii microalgae cells after administration of lead acetate compound showed unstable growth compared to the untreated container (control). Keywords: Microalgae; Tetraselmis chuii; Culture; Lead Acetate. Abstrak Mikroalga merupakan kelompok tumbuhan yang berukuran sangat kecil termasuk dalam kelas alga, memiliki diameter antara 3-30 μm baik sel tunggal maupun koloni yang dapat hidup di seluruh wilayah perairan air tawar maupun air laut. Mikroalga mengandung komponen aktif yang dapat digunakan dalam bidang industri kosmetik, makanan, farmasetika dan nutrasetikal. Adapun tujuan dari penelitian ini yaitu untuk mengetahui kepadatan sel mikroalga laut Tetraselmis chuii dalam media kultur sebelum perlakuan dan mengetahui kepadatan sel mikroalga T.chuii dengan pemberian senyawa timbal asetat pada konsentrasi yang berbeda. Metode yang digunakan pada penelitian ini yaitu mengkultur sel mikroalga laut pada wadah terkontrol dengan pemberian timbal asetat pada konsentrasi 30 ppm, 50 ppm, 70 ppm, kemudian dilakukan pengamatan melalui perhitungan jumlah sel di bawah mikroskop olympus dengan pembesaran 10x menggunakan haemocytometer. Pengamatan dilakukan setiap hari pada jam yang sama sampai pada fase kematian. Kultur mikroalga menggunakan lampu Light Emitting Diode (LED) dengan pencahayaan 6.840 lux. Hasil penelitian menunjukkan bahwa pertumbuhan mikroalga mikroalga T.chuii mengalami penurunan sel secara signifikan setelah pemberian senyawa timbal asetat dibandingkan dengan kontrol yang tidak diberi perlakuan. Kata kunci: Mikroalga; Tetraselmis chuii; Timbal Asetat.
Benthic Foraminifera Composition in Coral Reef Areas at Malalayang Beach Waters Alam, Muhammad Reza Sinar; Mamuaja, Jane M.; Windarto, Agung B.; Mantiri, Rose O. S. E.; Schaduw, Joshian N. W.
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.v12i2.51386

Abstract

Malalayang Beach is part of the coastal area of Manado Bay and is situated in the North Sulawesi Province of Indonesia. The coral reef ecosystem is one of the coastal ecosystems with high biodiversity. The uniqueness of the ecosystem and the diversity of its organisms make coral reef ecosystems have high social, ecological, and economic values. In 1998, the Environmental Protection Agency (EPA) of the United States recommended the use of foraminifera as indicators for aquatic assessments. Foraminifera is a meiobenthic components at the bottom of the sea that act as producer of calcium carbonate (CaCO3) in sediments in the benthic and pelagic zones of the sea. The purpose of this study was to study at the composition of benthic foraminifera based on their genus in the waters of Malalayang Beach and also assess the condition of coral reef waters on Malalayang Beach using the FoRAM Index. This research was carried out by taking sediment samples in Malalayang Beach in nine sampling points at a depth of 5–8.5 m. The samples were then washed and sorted to obtain foraminifera tests. From 2,830 successfully identified specimens, 17 genera were obtained with FoRAM index values ranging from 5.46 to 9.53. The average value of the FoRAM Index at Malalayang Beach is 7.32, indicating that the waters of Malalayang Beach are still suitable for coral growth. Keywords: Malalayang Beach, Foraminifera, Coral Reef, FoRAM Index Abstrak Pantai Malalayang adalah bagian dari Teluk Manado yang terletak di Sulawesi Utara, Indonesia. Ekosistem terumbu karang merupakan salah satu ekosistem pesisir dengan biodiversitas yang tinggi. Keunikan ekosistem serta keragaman organismenya menjadikan ekosistem terumbu karang memiliki nilai sosial, ekologi dan ekonomi yang tinggi. Environmental Protection Agency (EPA) dari Amerika Serikat menyarankan penggunaan foraminifera sebagai indikator penilaian perairan pada tahun 1998. Foraminifera merupakan komponen meiobentik di dasar perairan yang berperan sebagai penghasil kalsium karbonat (CaCO3) pada sedimen yang ada di zona bentik dan pelagis laut. Tujuan penelitian ini adalah untuk mempelajari komposisi foraminifera bentik berdasarkan genusnya pada perairan Pantai Malalayang dan juga menilai kondisi perairan terumbu karang di Pantai Malalayang menggunakan Indeks FoRAM. Penelitian ini dilakukan dengan cara mengambil sampel sedimen di perairan Pantai Malalayang pada sembilan titik pengambilan sampel dengan kedalaman 5 - 8,5 m. Selanjutnya sampel dicuci dan disortir untuk mendapatkan cangkang foraminifera. Dari sejumlah 2830 spesimen yang berhasil diidentikasi, diperoleh sebanyak 17 genus dengan nilai indeks FoRAM berkisar dari 5,46 -  9,53. Nilai rata-rata indeks FoRAM pada Pantai Malalayang adalah 7,32 dan ini mengindikasikan bahwa perairan Pantai Malalayang masih baik dan layak untuk pertumbuhan karang. Kata Kunci : Pantai Malalayang, Foraminifera, Terumbu Karang, Indeks FoRAM
Development Of Marine Tourism Potential In East Likupang Waters, North Minahasa District Maryen, Yakob Oskar; Manembu, Indri Shelovita; Ngangi, Edwin L. A.; Roeroe, Kakaskasen Andreas; Sambali, Hariyani; Darwasito, Suria; 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.v12i2.52238

Abstract

This research aims to determine the potential for marine tourism in East Likupang Waters, determine the suitability of developing marine tourism in East Likupang Waters, and recommend marine tourism management, collecting primary data through observation and in-depth interviews directly with the community. Secondary data through studies of research results, scientific publications, the Minahasa Regency Maritime and Fisheries Service, and the North Minahasa Regency Maritime and Fisheries Service. Biophysical data is as follows. Observation of coral conditions using Line Intercept Transect (LIT). b) Observation of fish using Underwater Fish Visual Census (UVC). Water quality using a water quality checker (Horiba brand). Apart from that, data analysis uses a matrix of suitability for marine tourism areas, and beach tourism and provides weighting. The results of this research show that the potential that exists in East Likupang Waters and its surroundings includes physical and non-physical potential that has the potential and can be developed into a marine tourism attraction. Carrying capacity and beach recreation Surabaya Beach beach area 2000 (m²) 533 people/day Pulisan Beach 2000 (m²) 533 people/day c) Paal Beach 1000 (m²) 267 people/day Kalinaun Beach 3000 (m²) 800 people/day, It was found that the percentage of coral cover in East Likupang Waters was 47.04%, with a marine tourism suitability index value of 62, which means that the suitability of the East Likupang Waters marine tourism area is included in the conditionally appropriate criteria. Keywords: Potential, Marin Tourism, East Likupang Waters Abstrak Penelitian ini bertujuan untuk mengetahui potensi wisata bahari di Perairan Likupang Timur, mengetahui kesesuaian pengembangan wisata bahari di Perairan Likupan Timur dan merekomendasikan pengelolaan wisata bahari, pengumpulan data primer melalui observasi dan wawancara mendalam langsung kepada masyarakat. Data sekunder melalui kajian hasil penelitian, publikasi ilmiah, Dinas Kelautan dan Perikanan Kabupaten Minahasa, dan Dinas Kelautan dan Perikanan Kabupaten Minahasa Utara. Data biofisik adalah sebagai berikut. Pengamatan kondisi karang menggunakan Line Intercept Transect (LIT). b) Pengamatan ikan menggunakan Underwater Fish Visual Census (UVC). Kualitas air menggunakan alat pemeriksa kualitas air (merek Horiba). Selain itu analisis data menggunakan matriks kesesuaian kawasan wisata bahari, dan wisata pantai serta memberikan pembobotan. Hasil penelitian menunjukkan bahwa potensi yang ada di Perairan Likupang Timur dan sekitarnya meliputi potensi fisik dan non fisik yang mempunyai potensi dan dapat dikembangkan menjadi daya tarik wisata bahari. Daya dukung dan rekreasi pantai Pantai Surabaya Luas pantai 2000 (m²) 533 orang/hari Pantai Pulisan 2000 (m²) 533 orang/hari c) Pantai Paal 1000 (m²) 267 orang/hari Pantai Kalinaun 3000 (m²) 800 orang/hari, Diketahui persentase tutupan karang di Perairan Likupang Timur sebesar 47,04% dengan nilai indeks kesesuaian wisata bahari sebesar 62 yang berarti kesesuaian kawasan wisata bahari Perairan Likupang Timur termasuk dalam kriteria layak bersyarat. Kata Kunci: Potensi; wisata bahari; Perairan Likupang Timur.
Study of the existence of algae, diversity of species, density, and distribution patterns in Meras waters Kalalembang, Delarosa; Kumampung, Deislie R. H.; Angkouw, Esther D.; Lintang, Rosita A. J.; Lasut, Markus T.; Darwisito, Suria
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.v12i2.52979

Abstract

This study aims to determine macroalgae species and analyze the index of diversity, density, dominance, and distribution patterns around the waters of Meras Village, Bunaken District, Manado. This research was carried out for 4 months starting from July – October 2023. Macroalgae sampling performed during the day was observed using the tides app to view the tides. The method used is the line transect method with the Quadrant sampling technique used to obtain data. When sampling at the research site, a total of 3 transects of 50 m were made, which were drawn perpendicular to the coastline. The distance between the transects is 25 m the distance between the quadrants is 5 m with the size of the Quadrant used to retrieve data is 1 x 1 m². The results of this study as a whole obtained 23 macroalgae species distributed in 3 divisions, namely Chlorophyta, Phaeophyta, and Rhodophyta. In the Chlorophyta Division, 8 species were obtained, then the Phaeophyta Division obtained 6 species, while the Rhodophyta Division obtained 9 species. In macroalgae data obtained in this study ranged from diversity index (H’) as a whole of transect 1 H’ = 2,537, transect 2 H’ = 2,269, while for transect 3 H’ = 1,980. Species density and relative density from transect 1 to transect 3 obtained the highest density is Padina australis. Dominance (C) overall value in transect 1 C = 0.098, transect 2 C = 0.113, while in transect 3 C = 0.153. The distribution pattern of macroalgae species in transect 1 was categorized as random, while transects 2 and 3 were categorized as clustered. Keywords: Macroalgae, Diversity, Density, Dominance, Dispersal Patterns. Abstrak Penelitian ini bertujuan untuk mengetahui spesies makroalga apa saja dan menganalisis indeks keanekaragaman, kepadatan, dominansi, dan pola penyebarannya di sekitar perairan Kelurahan Meras, Kecamatan Bunaken, Manado. Penelitian ini dilaksanakan 4 bulan mulai dari bulan Juli – Oktober 2023. Pengambilan sampel makroalga dilakukan pada siang hari diamati dengan menggunakan aplikasi tides untuk melihat pasang surut. Metode yang digunakan adalah metode garis transek (line transect) dengan teknik sampling kuadran modifikasi yang digunakan untuk memperoleh data. Saat pengambilan sampel di lokasi penelitian dibuat sebanyak 3 transek sepanjang 50 m yang ditarik tegak lurus dari garis pantai. Jarak antar transek 25 m dengan jarak antara kuadran yaitu 5 m dengan ukuran kuadran yang dipakai untuk mengambil data yaitu 1 x 1 m². Hasil pada penelitian ini secara keseluruhan diperoleh 23 spesies makroalga yang terdistribusi pada 3 divisi yaitu Chlorophyta, Phaeophyta, dan Rhodophyta. Pada divisi Chlorophyta diperoleh 8 spesies, kemudian divisi Phaeophyta diperoleh 6 spesies, sedangkan divisi Rhodophyta diperoleh 9 spesies. Pada data makroalga yang didapatkan di penelitian ini mulai dari indeks keanekaragaman (H’) secara keseluruhan dari Transek 1 H’ = 2.537, Transek 2 H’ = 2.269, sedangkan untuk Transek 3 H’ = 1.980. Kepadatan spesies dan kepadatan relatif dari Transek 1 hingga sampai Transek 3 diperoleh kepadatan tertinggi adalah Padina australis. Dominansi (C) secara keseluruhan nilai di Transek 1 C = 0.098, Transek 2 C = 0.113, sedangkan di Transek 3 nilai C = 0.153. Pola penyebaran spesies makroalga di transek 1 dikategorikan acak, sedangkan pada transek 2 dan 3 dikategorikan mengelompok. Kata kunci: Makroalga, Keanekaragaman, Kepadatan, Dominansi, Pola Penyebaran.
B3 Waste Management at PT Kereta Api Indonesia: a Literature Review Dewi, Dewi Fortuna Khairil; Razak, Abdul; Handayuni, Linda; Yuniarti, Elsa
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.v12i2.53179

Abstract

The amount of B3 waste sourced from the Locomotive Depot, Station, and Balai Yasa office of PT Kereta Api Indonesia (Persero) which is not managed properly and correctly will cause problems later both for the surrounding environment, passengers, and water quality that is close to the location of the waste source. This study aims to determine the management of B3 Waste carried out at all PT Kereta Api Indonesia stations. This type of research is research using the literature review method. The stages of literature collection used in this study refer to the Preferred Reporting Items for Systematic Review and Meta-Analysis (PRISMA) guidelines. This stage has four procedures: identification, screening, eligibility, and acceptance. This study shows that the management of hazardous waste at several stations from the articles that have been reviewed is found to be inconsistent with the workmanship and management based on applicable regulations. It can be concluded that hazardous waste at some of these stations does not meet the grouping, storage, and management requirements.
Morphometric study of Seagrass Enhalus acoroides (Linnaeus f.) Royle, 1839 in Coastal Waters of Budo Village Leslida, Ayu; Kepel, Rene Ch.; Menajang, Febry S. I.; Kondoy, Khristin F I.; Lumingas, Lawrence J. L.; Mantiri, Rose O. S. E.
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.v12i2.54481

Abstract

This research concerns the morphometry of seagrass E. acoroides (Linnaeus) Royle in 1839 in the coastal waters of Budo Village, Wori District, North Minahasa Regency. The existence of seagrass ecosystems in coastal waters is so important that it is necessary to carry out morphometric studies of seagrass, both for scientific purposes and for the sake of knowledge about seagrass itself. This research aims to describe the morphometrics of E. acoroides seagrass on the coast of Budo Village, Wori District, North Minahasa Regency, to compare the morphometrics of E. acoroides seagrass based on sampling stations, and to determine the condition of the aquatic environment (temperature, salinity, pH, substrate). The research location was divided into 3 sampling stations, namely the first mangrove area with 20 individuals, the second seagrass area with 30 individuals, and the third coral reef area with 10 individuals. The sampling process is carried out using a roaming survey method, the sample is washed and put into a plastic sample which will then be measured. The results statistically show that E. acoroides species in the coastal waters of Budo Village at three stations show significant differences in morphometric size, where station three is smaller than stations one and two. Environmental conditions and existing environmental parameters cause this. The condition of the environmental parameters at the three stations is still within safe limits, so it is still good for seagrass growth. Keywords: Seagrass, Enhalus acoroides, Morphometrics, Budo Village Abstrak Penelitian ini mengenai Morfometrik Lamun E. acoroides (Linneaus f.) Royle, 1839 di Perairan Pesisir Desa Budo, Kecamatan Wori, Kabupaten Minahasa Utara. Keberadaan ekosistem lamun di perairan pantai ini sangat penting sehingga perlu adanya kajian mengenai morfometrik lamun, baik untuk kepentingan ilmiah maupun untuk kepentingan pengetahuan tentang lamun itu sendiri. Adapun tujuan dari penelitian ini yaitu Mendeskripsikan morfometrik dari lamun E. acoroides di pesisir pantai Desa Budo, Kecamatan Wori, Kabupaten Minahasa Utara, Membandingkan morfometrik lamun E. acoroides berdasarkan stasiun pengambilan sampel,dan Mengetahui kondisi lingkungan perairan (suhu, salinitas, pH, substrat). Lokasi penelitian dibagi 3 stasiun untuk pengambilan sampel yaitu stasiun satu daerah mangrove dengan mengambil 20 individu, stasiun dua daerah lamun 30 individu, dan stasiun tiga daerah terumbu karang dengan mengambil 10 individu. Proses pengambilan sampel dilakukan dengan metode survei jelajah, sampel dicuci dan dimasukkan ke dalam plastik sampel yang kemudian akan diukur. Hasil yang diperoleh secara statistik bahwa spesies Enhalus acoroides di Pesisir Pantai Desa Budo pada tiga stasiun terlihat ada perbedaan nyata untuk ukuran morfometriknya, dimana stasiun tiga ukurannya lebih kecil dibanding stasiun satu dan dua. Hal ini karena kondisi lingkungan dan parameter lingkungan yang ada. Kondisi parameter lingkungan pada tiga stasiun masih dalam batas aman dimana masih baik untuk pertumbuhan lamun. Kata Kunci : Lamun, Morfometrik, Enhalus acoroides, Desa Budo
Analysis of Marketing Strategy of Freshwater Ornamental Fish Business in Bandung City, West Java Province Haganta, Louise David; Nurhayati, Atikah; Liviawaty, Evi; Gumilar, Iwang
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.v12i2.55236

Abstract

The purpose of this study is to analyze appropriate marketing strategies that can be applied to the freshwater ornamental fish business in Bandung City. The research will be conducted in a time frame and location from March to April 2024 in Bandung City. The analysis method used is SWOT analysis. The initial stage involves the analysis of internal factors (IFAS) and external factors (EFAS). Next, perform the calculation of the IFE EFE matrix and the formulation of marketing strategies using the grand strategy matrix. Based on the results of the analysis, both internal factors and external factors each have 5 factors. Strengths include Good quality ornamental fish, strategic location, affordable prices, a large selection of fish species, and comfortable and clean stores. Weaknesses include hampered marketing activities, promotion has not been maximized, fish dying from the disease, do not update on social media, and unsatisfactory service. Opportunities include the trend of ornamental fish, the number of ornamental fish suppliers being relatively large, supportive government policies, consumer confidence in products, and ornamental fish as a hobby or decoration. Threats include changes in consumer tastes, increasingly fierce business competition, price games from competitors, the entry of ornamental fish from abroad, and a lack of market information. The results of the grand strategy matrix analysis show that the position of the X-axis (0.48) and the Y-axis (0.42) is in quadrant I, so the right strategy that can be applied is an aggressive strategy (SO) which means utilizing strengths and opportunities. S-O strategies that can be applied include maintaining and improving the quality of ornamental fish, increasing the number of different types of ornamental fish, setting prices that can be reached by consumers, expanding ornamental fish business premises, and arranging and maintaining the cleanliness of business premises. Keywords: SWOT analysis; Freshwater ornamental fish; Marketing strategy. Abstrak Tujuan penelitian ini adalah untuk menganalisis strategi pemasaran yang tepat yang dapat diterapkan pada usaha ikan hias air tawar di Kota Bandung. Waktu dan lokasi penelitian dilakukan pada bulan Maret sampai bulan April 2024 di Kota Bandung. Analisis yang digunakan dalam penelitian ini adalah analisis SWOT. Tahap pertama dengan melakukan analisis faktor internal (IFAS) dan faktor eksternal (EFAS). Berikutnya melakukan perhitungan matriks IFE EFE dan perumusan strategi pemasaran menggunakan matriks grand strategi. Berdasarkan hasil analisis faktor internal dan faktor eksternal masing-masing memiliki 5 faktor. Kekuatan meliputi Kualitas ikan hias baik, lokasi strategis, harga yang terjangkau, banyak pilihan jenis ikan, dan toko yang nyaman dan bersih. Kelemahan meliputi Kegiatan pemasaran terhambat, promosi belum maksimal, ikan mati karena penyakit, tidak update dimedia sosial, pelayanan yang tidak memuaskan. Peluang meliputi Tren ikan hias mengalami peningkatan, jumlah pemasok ikan hias relatif banyak, kebijakan pemerintah yang mendukung, kepercayaan konsumen terhadap produk, dan ikan hias sebagai hobi ataupun hiasan. Ancaman meliputi perubahan selera konsumen, persaingan bisnis semakin ketat, permainan harga dari pesaing, masuknya ikan hias dari luar negeri, dan kurangnya informasi pasar. Hasil dari analisis matriks grand strategi menunjukkan posisi sumbu X (0,48) dan sumbu Y (0,42) berada pada kuadran I, maka strategi yang tepat yang dapat diterapkan adalah strategi agresif (SO) yang berarti memanfaatkan kekuatan (strength) dan peluang (opportunities). Strategi SO yang dapat diterapkan antara lain Mempertahankan dan meningkatkan kualitas ikan hias, menambah jumlah jenis ikan hias yang berbeda, menetapkan harga yang dapat dijangkau oleh konsumen, memperluas tempat usaha ikan hias, serta menata dan menjaga kebersihan tempat usaha. Kata Kunci: Analisis SWOT; Ikan hias air tawar; Strategi pemasaran.
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.
Mangrove Community Structure In Mesjid Lama Village, Talawi District, Batu Bara District, North Sumatra Province Simamora, Ronita Haulian; Handoco, Ewin; , welmar Olfan Basten Barat
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.v12i2.55442

Abstract

Mangroves are ecosystems in intertidal areas with strong interaction between marine, brackish, river, and terrestrial waters. Mangrove forests are one of the natural resources of coastal areas which have an important role in ecology, economy, and social aspects. The main benefit of mangroves is balancing the ecosystem and providing various life needs for humans and other living creatures. Besides being known to have economic potential as a provider of wood resources, fishing, crabs, and so on, mangrove forest resources also play a role in preventing sea waves and seawater intrusion towards land. The research location is in Mesjid Lama Village, Talawi District, Batu Bara Regency, North Sumatra Province. Mangrove observations used the quadrant transect method, where this research analyzed the types of mangroves, diversity, uniformity of mangroves, dominance, and INP of mangroves, and canopy cover. Three species of mangroves were found in Mesjid Lama Village, Talawi District, Batu Bara Regency, namely Avicenia Officinalis, Bruguiera cylindrica, and Rhizophora apiculata. Keywords: Mangrove Ecosystem, Diversity, Uniformity, Dominance, Importance Value Index, Mangrove Canopy Cover. Abstrak Mangrove merupakan ekosistem yang berada pada wilayah intertidal dimana pada wilayah tersebut terjadi interaksi yang kuat antara perairan laut, payau, sungai dan terestrial. Hutan mangrove merupakan salah satu sumberdaya alam wilayah pesisir yang memiliki peranan penting dari segi ekologi, ekonomi, dan social nya. Manfaat utama mangrove sebagai penyeimbang ekosistem dan penyedia berbagai kebutuhan hidup bagi manusia dan makhluk hidup lainnya. Sumberdaya hutan mangrove, selain dikenal memiliki potensi ekonomi sebagai penyedia sumberdaya kayu, penangkapan ikan, kepiting dan lain - lain, juga berperan untuk menahan gelombang laut dan intrusi air laut ke arah darat. Lokasi penelitian berada di Desa Mesjid Lama Kecamatan Talawi Kabupaten Batu bara Sumatera Utara, Pengamatan mangrove menggunakan metode transek kuadran, dimana penelitian ini menganalisis jenis – jenis mangrove, Keanekaragaman dan keseragaman mangrove, Dominansi dan INP mangrove serta Tutupan kanopi. Jenis mangrove di Desa Mesjid Lama Kecamatan Talawi Kabupaten Batu bara ditemukan 3 spesies yaitu Avicenia oficinalis, Bruguiera cylindrica, dan Rhizophora apiculata. Kata Kunci : Mangrove, Keanekaragaman dan Keseragaman, Dominansi, Indeks Nilai Penting, Tutupan Kanopi.
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.

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