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All Journal Jurnal Ilmu Pertanian Indonesia Jurnal Fitopatologi Indonesia Biospecies ILMU KELAUTAN: Indonesian Journal of Marine Sciences Reaktor Bioma : Berkala Ilmiah Biologi Microbiology Indonesia AL KAUNIYAH Biota: Jurnal Ilmiah Ilmu-Ilmu Hayati Jurnal Bahan Alam Terbarukan Biosfer: Jurnal Tadris Biologi Biogenesis: Jurnal Ilmiah Biologi Journal of Degraded and Mining Lands Management Indonesian Journal of Biotechnology Jurnal Agro Planta Tropika BIO-SITE |BIOLOGI Sains Terapan Majalah Obat Tradisional Journal of Natural Sciences and Mathematics Research Jurnal Perlindungan Tanaman Indonesia Journal of Tropical Biodiversity and Biotechnology Omni-Akuatika Majalah Ilmiah Biologi BIOSFERA: A Scientific Journal Jurnal Agrotek Tropika Jurnal Riset Biologi dan Aplikasinya Filogeni: Jurnal Mahasiswa Biologi Berkala Ilmiah Biologi International Journal of Oil Palm
Rina Sri Kasiamdari
Universitas Gadjah Mada
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Energy Environmental Science Health Professions Immunology & microbiology Materials Science & Nanotechnology Medicine & Pharmacology Physics Public Health Social Sciences Veterinary Other

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Intraspecific Variation of Sargassum polycystum C. Agardh from Sundaland, Indonesia, Based on Morphological Characters Nurmiyati Nurmiyati; Sutarno Sutarno; Rina Sri Kasiamdari; Purnomo Purnomo
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.31.2.113-123

Abstract

Sargassum polycystum C. Agardh is a keystone species in tropical waters' ecosystems and is characterized by high morphological plasticity. The Sundaland region, which consists of a wide range of oceanographic conditions, offers diverse microhabitats that may promote complex patterns of phenotypic variation. However, studies on intraspecific variation of S. polycystum in this region are still limited. Therefore, this study aimed to examine the morphological variation of S. polycystum at ten locations in Sundaland and identify key diagnostic characters that drive population differentiation. A total of 200 individuals were analyzed using 37 morphological characters. Phenotypic relationships were mapped using UPGMA cluster analysis with Gower Similarity Index and Principal Component Analysis (PCA). The results showed relatively homogeneous water chemistry parameters across sites, whereas physical characteristics varied among locations. Quantitative traits were uniform across populations (p = 0.99), suggesting growth stability associated with nutritional homogeneity. UPGMA analysis separated populations into two groups based on habitat typology. PCA showed that phylloid margin shape and vesicle morphology were the main diagnostic characters. Intertidal populations were characterized by serrated phylloids and densely spined primary branches, which likely function as drag-reducing mechanisms, whereas subtidal populations developed winged vesicles to enhance buoyancy. These findings suggest a segregation mechanism, where morphological variation in S. polycystum is driven by phenotypic plasticity to environmental physical constraints, regardless of water chemistry. A comprehensive understanding of these microhabitat-based ecological adaptation patterns provides important fundamental information for resolving macroalgal taxonomy, while simultaneously supporting sustainable coastal resource management and conservation strategies in tropical waters.  
Co-Authors AA Sudharmawan, AA Achmadi Priyatmojo Adiana Nayogyani Ali Djamhuri Ali, Nur Ayu Aisyah Ana Susianti Ani Widiastuti, Ani Auli, Nisa Raudatul Ayundai, Melin Ayundai, Melin BUDI SETIADI DARYONO BUDI SETIADI DARYONO C. J. Soegihardjo C.J. Soegihardjo C.J. SOEGIHARDJO C.J. Soegihardjo Chasanah, Laila Uswatun Dhia Salsabila Hakim Dian Fitriarni Ekowati , Nuraeni Elzahra Nadya Putri ENDANG SUTARININGSIH SOETARTO Endang Sutariningsih Soetarto Erni Martani Erni Martani Febriani, Anya Via Ganies Riza Aristya Harvianti, Yuniar Hasnaul Maritsa I Gusti Wayan Murjana Yasa Inayati, Evi Indra Sukmawati Junita Hardini Khaterine K Kusrinah Kusrinah Kusrinah Kusrinah Laila Hanum Maulin Nafisa Miftahul Ilmi, Miftahul Muslikhin Hidayat Nita Aminasih Nuraeni Ekowati Nuraeni Ekowati Nuraeni Ekowati Nuraeni Ekowati, Nuraeni Nurmiyati Nurmiyati Nursamsi Pusposendjojo Nursamsi Pusposendjojo Nursamsi Pusposendjojo Nursamsi Pusposendjojo, Nursamsi Nursela, Dewi Padil Padil Padil, Padil Purnomo Purnomo Purnomo Purnomo Pusposendjojo , Nursamsi Putranto, Dwiyandito Ikhsan Putri, Elzahra Nadya Putri, Fauzana Putri, Fauzana R. Rugayah Ratna Stia Dewi Ratna Stia Dewi Reine Suci Wulandari Rejeki Siti Ferniah Retno Peni Sancayaningsih RETNO PENI SANCAYANINGSIH Retno Peni Sancayaningsih Ristiyani Khofifa Putri ROSA SURYANTINI Rugayah Rugayah S. Santosa Santosa . Santosa Santosa Santosa Santosa Sari, Noorkomala Singgih Tri Wardana Siti Syamsiah Siti Syamsiah Soegihardjo , C.J. Soekarti Moeljopawiro Soekarti Moeljopawiro, Soekarti Suharno Suharno Susiana Purwantisari Sutarno Sutarno Sutikno S Syaifudin, Andang Syamsiah, Siti Widiastuti, Ani Yekti Asih Purwestri Zakaria Zakaria