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http://dx.doi.org/10.11614/KSL.2014.47.4.247

Relationship between Distribution of the Dominant Phytoplankton Species and Water Temperature in the Nakdong River, Korea  

Yu, Jae Jeong (Nakdong River Water Environmental Research Center, National Institute of Environmenl Research)
Lee, Hye Jin (Nakdong River Water Environmental Research Center, National Institute of Environmenl Research)
Lee, Kyung Lak (Nakdong River Water Environmental Research Center, National Institute of Environmenl Research)
Lyu, Heuy Seong (Nakdong River Water Environmental Research Center, National Institute of Environmenl Research)
Whang, Jeong Wha (Nakdong River Water Environmental Research Center, National Institute of Environmenl Research)
Shin, La Young (Nakdong River Water Environmental Research Center, National Institute of Environmenl Research)
Chen, Se Uk (Nakdong River Water Environmental Research Center, National Institute of Environmenl Research)
Publication Information
Abstract
The construction of eight large weirs in the Nakdong River, Korea, caused a decrease in the water flow velocity and several physical changes to the water environment. Here, changes in phyto- and zooplankton communities and water quality in the areas near the eight weirs were investigated from 2011 to 2013, and relationships between phytoplankton abundances and environmental factors were analyzed. Special emphasis was given to the succession patterns in algal abundance based on temperature fluctuations. At the eight weirs, 24 dominant species were found. The most abundant phytoplankton species was Stephanodiscus sp. (39.4% of dominant frequency). Cyanobacteria of the genus Microcystis dominated during the summer, with an dominant frequency of 8.5% and cell abundance ratio of 36.6%. Significant correlations were observed between temperature and abundance of eight of the main dominant species; seven species showed positive correlations with temperature. Stephanodiscus sp., however, showed a negative correlation with temperature (r=-0.26, p<0.01). In addition, this species showed a significant negative correlation with the dominant algal species-Aulacoseira granulata and Aphanizomenon flos-aquae, with the zooplankton Copepoda and with Cladocera. On the contrary, seven other dominant species of algae showed significant positive correlations with zooplankton. Thus, we showed that the seasonal succession of plankton communities in the Nakdong River was related to the water temperature changes.
Keywords
blue-green algae; environmental factors; dominant species; water blooms; water temperature;
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