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All Journal Jurnal Teknologi Perikanan dan Kelautan Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Jurnal Pasir Laut Management of Aquatic Resources Journal (Maquares) JFMR (Journal of Fisheries and Marine Research) Jurnal Sains Teknologi dan Lingkungan (JSTL) Acta Aquatica: Aquatic Sciences Journal Jurnal Laut Khatulistiwa Jurnal Akuatiklestari Bioscientist : Jurnal Ilmiah Biologi E-Amal: Jurnal Pengabdian Kepada Masyarakat
Oktavianto Eko Jati
Program Studi Manajemen Sumberdaya Perairan Departemen Sumberdaya Akuatik Fakultas Perikanan Dan Ilmu Kelautan Universitas Diponegoro
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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 Anhar Solichin Aninditia Sabdaningsih Ardiansyah, Muh. Putra Ardy Ardy, Ardy Arif Rahman Arif Rahman Arofah, Rizka Ummi Assyifa, Siti Fatma Bambang Sulardiono Churun Ain David Nugroho Dewi, Desca Estiyani Dewi, Shilfi Rohmatika DIAH AYUNINGRUM Diah Ayuningrum, Diah Dimas Wahyu Anggara Diva Triza Novitasari Fadhila, Zalfa Langgeng Haque, Maharani Zahiratun Jakasukmana, Munandar Katon, Muhammad Rajes Kukuh Prakoso Kukuh Prakoso, Kukuh Laila, Qadarina Nur Lailatussyifa, Ayu Lani Febriana Safitri Max Rudolf Muskananfola Niniek Widyorini Norma Afiati Novitasari, Diva Triza Nur Handayani Nur Kharimah Nur’aini, Estri Nurdin, Nur Masyitha Nurfuad, Ferdian Adam Nurhuda, Izza Siti Nursubekhi, Rijal Galih Amta NURUL HIDAYAH Prasasti, Lingga Dewi Pratama, Hanif Huda Pujiono Wahyu Purnomo Pujiono Wahyu Purnomo Rini, Indri Putri Sekar Rosari, Arinda Salsabila, Ananda Tania Siti Rudiyanti Suryanti Suryanti - Sutrisno Anggoro Sutrisno Anggoro Trismara, Belia Kharisma Balqis Yudiarso, Permana Yuli Astuti Zebua, Vanda Florist