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All Journal BULETIN OSEANOGRAFI MARINA Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Jurnal Pasir Laut Management of Aquatic Resources Journal (Maquares) AL KAUNIYAH Kreano, Jurnal Matematika Kreatif-Inovatif Jurnal Kelautan Tropis Journal of Biology Education JFMR (Journal of Fisheries and Marine Research) Acta Aquatica: Aquatic Sciences Journal Jurnal Laut Khatulistiwa Biosaintifika: Journal of Biology & Biology Education Sains Akuakultur Tropis : Indonesian Journal of Tropical Aquaculture International Journal of Applied Guidance and Counseling Makara Journal of Technology
Diah Ayuningrum, Diah
Universitas Negeri Surabaya
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Variasi Konsentrasi Nutrien dan Dampaknya terhadap Kelimpahan Fitoplankton di Perairan Teluk Semarang Jati, Oktavianto Eko; Afiati, Norma; Purnomo, Pujiono Wahyu; Ayuningrum, Diah; Dewi, Desca Estiyani
Jurnal Laut Khatulistiwa Vol. 9 No. 1 (2026): February
Publisher : Dept. Marine Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/lkuntan.v9i1.104265

Abstract

Phytoplankton are important microorganisms in water ecosystems. They help in the nutrient cycle. Nutrients in water affect how many and what types of phytoplankton are present. This also impacts the fertility of coastal waters like Semarang Bay, which are influenced by human activities. This study looks at the link between water nutrients, phytoplankton, and water fertility. The study used a descriptive, quantitative method on November 10, 2024, at 6 chosen locations. Measurements taken on-site included DO, temperature, salinity, pH, and transparency. Lab tests looked at phytoplankton types, chlorophyll-a, silica, nitrate, nitrite, orthophosphate, and TSS using SNI and APHA methods. The main phytoplankton types were Diatoms, Dinoflagellates, and Cyanobacteria (26 types), with Chaetoceros being the most common (1,598 cells/L). Bacteriastrum and Chaetoceros were seen most often. Environmental data showed temperatures from 29.2–33.3°C, pH 8.6–8.8, DO 5.3–7.3 mg/L, salinity 32–33‰, and water clarity 0.55–5.97 m; chlorophyll-a 1.55–8.85 µg/L. TSS levels were 18.58–38.94 mg/L, nitrate 1.3–1.9 mg/L, nitrite 0.01–0.02 mg/L, and phosphate 0.8 mg/L, with the highest silica at Station 4. PCA analysis showed a productivity pattern (PC1) that was positively associated with chlorophyll-a, phytoplankton numbers, silica, and dominance, but negatively associated with TSS, nitrate–nitrite, and transparency. This means silica helps diatom growth, while high TSS can reduce productivity by blocking light, even though it might bring nutrients.
Co-Authors Agus Hartoko Agus Sabdono Alif Muarifah Amanina, Farha Tsabita Aninditia Sabdaningsih Bahry, Muhammad Syaifudien Bambang Sulardiono Bangun, M. Fadhillah Rasyid Beginer Subhan Clara, Jessika Oktaviani David Nugroho Dewi, Desca Estiyani Fadhila, Zalfa Langgeng Fahlevi, Arief Reza Febrianto, Sigit Fenetiruma, Syamsudin Firdaus, Nur Salsabila Frida Purwanti Haeruddin Haeruddin Haryani, Nisrina Septi Herettrenggi, Rosa Junaedy, Ahmad Kintani, Novia Indah Kukuh Prakoso, Kukuh Kusumarani, Dheni Lazuardhi, Risqi Lundin, Kennet Malaihollo, Jantje Jacobus Max Rudolf Muskananfola Muttaqin, Ahmad Sabilul Niniek Widyorini Norma Afiati Novitasari, Diva Triza Nugraha, Ariadi Nur Handayani Nur Hidayah Nurhuda, Izza Siti Nurlaela, Yulfa Rahmanissa Oktavianto Eko Jati Prehadi, Prehadi Pujiono Wahyu Purnomo Rahayu, Sari Sistyawati Rakhim, Lutfi Nur Ratna Diyah Palupi Raunsai, Jhoni Elias Raweyai, Oktofianus Obaja Rizaldi, Rahmat Rohmatus Isnaini Rosari, Arinda Rudolf Muskananfola, Max Santoso Budi Widiarto Sianturi, Yenti Agustina Sombo, Hendrik Sri Mulyani Endang Susilowati, Sri Mulyani Endang Suradi Wijaya Saputra Suryanti Taufani, Wiwiet Teguh Utari, Erni Dwi Yustina, Nurul Zebua, Vanda Florist