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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences Omni-Akuatika
Beginer Subhan
Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Environmental Science

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Morphometric Features of Noctiluca scintillans from Jakarta Bay Radixa Radhya Ramadhan Haryanto; Meutia Samira Ismet; Adriani Sunuddin; Inna Puspa Ayu; Muhammad Izzat Nugraha; Alfaiz Arselan; Kesha Mufthi Java Tanaya; Dea Fauzia Lestari; Dondy Arafat; Nadya Cakasana; Beginer Subhan
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 31, No 2 (2026): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.31.2.133-144

Abstract

Noctiluca scintillans is a mixotrophic dinoflagellate commonly associated with eutrophic coastal systems and bloom dynamics. This study aims to characterize the morphometric variability of N. scintillans in Jakarta Bay, a tropical coastal environment strongly influenced by anthropogenic nutrient enrichment, and to evaluate how cellular morphology reflects functional and ecological responses under eutrophic conditions. Plankton samples were collected in February 2024 and analyzed using high-resolution microscopy to quantify key morphometric traits, including cell diameter, biovolume, aspect ratio, surface area-to-volume (SA:V) ratio, and nucleus-to-cytoplasm (N:C) ratio. Differences between red (RNS) and green (GNS) morphotypes were assessed using non-parametric statistical analyses, and preserved measurements were corrected to estimate live cell size. A total of 121 cells were analyzed, with RNS overwhelmingly dominating the population. RNS exhibited significantly larger cell diameter and volume than GNS, while SA:V ratios differed significantly between morphotypes, indicating functional differences in size-related morphology. In contrast, aspect ratio did not differ significantly, suggesting overall conservation of cell shape across morphotypes. Estimated live cell sizes indicate that N. scintillans populations in Jakarta Bay are dominated by relatively small cells compared to those reported from temperate regions. Variability in the N:C ratio further suggests heterogeneity in cellular physiological states within the population. Overall, these findings establish a morphometric baseline for N. scintillans in Jakarta Bay and highlight the value of morphometric traits as integrative indicators of physiological variability and environmental forcing in tropical eutrophic coastal systems.
Revealing Porifera Diversity by Metabarcoding Environmental DNA Data in Coral Reef Ecosystems of Lombok Island Waters Arief Pratomo; Jelita Rahma Hidayati; Carolline Desrainy Nababan; Beginer Subhan; Inna Puspa Ayu
Journal Omni-Akuatika Vol 21, No 2 (2025): Omni-Akuatika November
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2025.21.2.1226

Abstract

Lombok waters are located in the Coral Triangle area, a region with high marine biodiversity, including Porifera. Information on Porifera diversity in Lombok waters is still minimal, due to the difficulty of identifying them. Metabarcoding eDNA is an alternative method for revealing the potential diversity of Porifera non-invasively, widely, quickly, and effectively. This study aimed to determine the diversity of Porifera with eDNA data in Lombok Waters. This study used quantitative methods with bioinformatics tools in the data processing process. The eDNA data were obtained from previous research results that have been stored in GenBank PRJNA768103 which includes seawater and sediment sample types in the 12 µm and 0.4 µm membrane pore fractions in the East, West, and North Lombok regions This study successfully identified 19 genera of Porifera dominated by Hippospongia, Haliclona, and Terpios in each location and sample type. Comparison of alpha diversity showed a significant difference in membrane pore fraction (p = 0,0262). Meanwhile, beta diversity showed a significant difference in the Porifera community between East and North Lombok (p = 0,01). Significant differences in alpha and beta diversity indicate the influence of environmental factors and habitat characteristics in shaping the community structure of Porifera in Lombok waters. These findings highlight the potential of the eDNA approach as an efficient biomonitoring tool for marine biodiversity and support sustainable management and conservation of Lombok’s marine ecosystems.
Co-Authors Adriani Sunuddin Alfaiz Arselan Arief Pratomo Carolline Desrainy Nababan Dea Fauzia Lestari Dondy Arafat Inna Puspa Ayu Inna Puspa Ayu Jelita Rahma Hidayati Kesha Mufthi Java Tanaya Meutia Samira Ismet Muhammad Izzat Nugraha Nadya Cakasana Radixa Radhya Ramadhan Haryanto