Abstract
Green algal blooms by Cladophora species are primarily reported in freshwater and coastal regions and cause severe ecological problems. A taxonomic report of the geographic distribution of Cladophora blooms is essential to explore the cause and impact of macroalgal blooms and for eco-physiological studies. The identification of blooming species is necessary for monitoring and controlling algal blooms. Genetic information of DNA sequences is useful for identifying species in the genus Cladophora. In the coastal area of Sangrok, Korea, a large-scale Cladophora bloom was reported for the first time in September 2015. In the present study, we identified the taxonomic entity of Cladophora oligocladoidea (Ulvophyceae, Cladophorales) in Korea. We report for the first time a green algal bloom by this species globally. This is the second report about genetic diversity of C. oligocladoidea since the species was established in Japan. Four ribotypes in the internal transcribed spacer (ITS) region of the nuclear ribosomal DNA represent the genetic diversity of Korean C. oligocladoidea. The results from this taxonomic report and our analysis of the green algal bloom of Korean C. oligocladoidea can provide valuable data to understand the geographic distribution and the genetic diversity of the species.
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