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This study aims to determine the structure of the epiphytic microalgae communities in Padina and Caulerpa, the quality of the aquatic environment and the correlation of the density of epiphytic microalgae with the parameters of the aquatic environment in Kabung Island West Kalimantan. This research was conducted in October 2019 using a survey method and the determination of the sampling station by purposive sampling which consists of three stations based on the environmental baseline. Station I is the boat dock, Station II is citizen activity and Station III is without citizen activity. Structure of epiphytic microalgae communities in Padina and Caulerpa the waterway Kabung Island consisted of 5 divisions, 7 classes, 45 orders, 62 families and 76 genera. The highest density of epiphytic microalgae in the surface watersof Kabung Islandis stasion III with values (4873 ind/5g and 80,28%) in Padina and the lowest density is stasion I (2653 ind/5g and 63,24%) in Caulerpa. The dominant genera most Amphora, Nitzchia, Pinnularia, Synedra, Chlamydomonas and Botryodiopsis. The range diversity index (H') (3,58-3,71), uniformity index (E) (0,84-0,89), dominance index (C) (0,03-0,04) ) and sorensen similarity index (89,7094,28%). The environmental parameters of Kabung Island waters which have a perfect correlation with the density of epiphytic microalgae are temperature, DO, salinity, conductivity, currents and nitrates with a value of 1 to -1, whereas depth, phosphate and pH tended not to show a significant.

Struktur Komunitas Mikroalga Epifit Pada Padina dan Caulerpa di Perairan Pulau Kabung Kalimantan Barat