| Title |
Distribution Changes of Freshwater Microalgae Community in the Nakdonggang River, Korea |
| Authors |
윤석민 ( Suk Min Yun ) ; 권대률 ( Dae Ryul Kwon ) ; 박미례 ( Mirye Park ) ; 이창수 ( Chang Soo Lee ) ; 이상득 ( Sang Deuk Lee ) |
| DOI |
https://doi.org/10.15681/KSWE.2023.39.2.181 |
| Keywords |
Freshwater; Microalgae community; Nakdonggang River; Seasonal variation |
| Abstract |
Distribution changes in microalgae communities were studied in the Nakdonggang River at two sampling stations (St.1 Gyeongcheongyo Bridge (GB) and St.2 Daedong Wharf (DW)) at monthly intervals from January 2021 to November 2021. A total of 83 taxa included 82 species, 1 forma, belonging to 49 genera, 32 families, 21 orders, and 8 classes. The most important groups were Bacillariophyta and Chlorophyta. The number of species ranged from 5 to 24 in GB, and from 9 to 21 taxa in DW. The contribution of Bacillariophyta to the total species richness was the highest during all survey periods, and Chlorophyta yielded the next highest value in the study area. The dominant taxa were Aulacoseira ambigua, A. ambigua f. japonica, and Ulnaria acus in this study. Cluster analysis and non-metric multidimensional scaling (nMDS) analysis based on Bray- Curtis similarity identified 4 major groups, which corresponded to microalgae assemblages and their characteristic species. Correlation was analyzed through the CCA analysis. It was found that there was a correlation between the microalgae and environmental factors. It was revealed that the divided groups were distinguished because of the differences by the survey period. Therefore, seasonal change was judged as a major factor affecting the distribution of microalgae communities. |