The purpose of this study is to determine and analyze the level of diversity of Chlorophyta on the intertidal area of Karapyak waters. The study was conducted from January to March 2018 at Karapyak beach, Pangandaran regency. Research parameters analyzed were species density, species frequency, species cover, Importance Value Index, Diversity and Uniformity of macroalgae. The measured environmental parameters are temperature, salinity, DO, pH, nitrate and phosphate. The results showed that there were 6 species macroalgae of the division Chlorophyta found on Karapyak Beach. The macroalgae (H) diversity index value is in the low category based on the index of the Shannon-Wienner. Meanwhile, the uniformity index value (E) is in the high category according to the Evennes index, which means that no species dominates the Karapyak waters.
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