Key Factors Controlling Primary Production and Cyanobacterial Harmful Algal Blooms (cHABs) in a Continuous Weir System in the Nakdong River, Korea

Jisoo Choi, Jun Oh Min, Bohyung Choi, Dokyun Kim, Jae Joong Kang, Sang Heon Lee, Kwangsoon Choi, Heesuk Lee, Jinyoung Jung and Kyung-Hoon Shin
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Jisoo Choi: Department of Marine Sciences and Convergent Technology, Hanyang University, Ansan 15588, Korea
Jun Oh Min: Department of Marine Sciences and Convergent Technology, Hanyang University, Ansan 15588, Korea
Bohyung Choi: Department of Marine Sciences and Convergent Technology, Hanyang University, Ansan 15588, Korea
Dokyun Kim: Department of Marine Sciences and Convergent Technology, Hanyang University, Ansan 15588, Korea
Jae Joong Kang: Department of Oceanography, Pusan National University, Pusan 46241, Korea
Sang Heon Lee: Department of Oceanography, Pusan National University, Pusan 46241, Korea
Kwangsoon Choi: K-water Institute, Daejeon 34045, Korea
Heesuk Lee: K-water Institute, Daejeon 34045, Korea
Jinyoung Jung: Division of Polar Ocean Sciences, Korea Polar Research Institute (KOPRI), Incheon 211990, Korea
Kyung-Hoon Shin: Department of Marine Sciences and Convergent Technology, Hanyang University, Ansan 15588, Korea

Sustainability, 2020, vol. 12, issue 15, 1-21

Abstract: To identify key factors that control primary production (P.P.) and trigger cyanobacterial harmful algal blooms (cHABs), we investigated spatio-temporal variations in P.P. in a continuous weir system in the Nakdong River once or twice a month from April to October 2018. P.P. was measured through an in-situ incubation experiment using a 13 C tracer. Relative proportion of pigment-based phytoplankton composition was calculated by the CHEMTAX program based on pigment analysis using a high-performance liquid chromatography (HPLC). P.P. was higher in spring (1130 ± 1140 mg C m −2 d −1 ) and summer (1060 ± 814 mg C m −2 d −1 ) than autumn (180 ± 220 mg C m −2 d −1 ), and tended to increase downstream. P.P. was negatively related to PO 4 3− (r = −0.41, p < 0.01) due to utilization by phytoplankton during the spring and summer when it was high. The relative proportion of pigment-based cyanobacteria (mainly Microcystis sp.) was positively correlated with water temperature (r = 0.79, p < 0.01) and hydraulic retention time (HRT, r = 0.67, p < 0.01), suggesting that these two factors should affect cHABs in summer. Therefore, to control HRT could be one of the solutions for reducing cHABs in a continuous weir system.

Keywords: continuous weir; cHABs; primary productivity; environmental factors; pigment; CHEMTAX (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
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