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Epiphytic microalgae is an organism that can live attaching to the substrate such as macroalgae. Epiphytes have an important role in increasing primary productivity and aquatic bioindicators. The purpose of this study was to determine the community structure of associated epiphytic microalgae in Sargassum sp. in Sepempang Village waterway, Natuna Regency. The study was conducted in January June 2019. The sampling of epiphytic microalgae was carried out through in situ. The study was conducted by survey method and the determination of sampling stations by purposive sampling. The macroalgae sampling location consisted of 4 stations with different environmental bases. The result of epiphytic microalgae identification consist of 8 classes, 36 orders, 50 families and 65 genera. The class of bacillariophyceae (diatoms) was found dominantly with the percentage of abundance (72.67%), where the abundance of diatom pennate (81.69%) and diatom centric (18.31%). The dominant genera that found were Navicula, Nitzschia, Synedra, Cocconeis and Pinnularia. Diversity index (H ') ranges from 3.04-3.18, uniformity index (E) ranges from 0.77-0.83, dominance index (C) ranges from 0.060.07, and Sorensen Similarity index (ISS) ranges from 75.55-87.80%.

Struktur Komunitas Mikroalga Epifit Berasosiasi Pada Padina sp. di Perairan Desa Sepempang Kabupaten Natuna