Variations in the Temporal and Spatial Distribution of Microalgae in Aquatic Environments Associated with an Artificial Weir

Suk Min Yun, Sang Deuk Lee, Pyo Yun Cho, Seung Won Nam, Dae Ryul Kwon, Chung Hyun Choi, Jin-Young Kim and Jong-Suk Lee
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Suk Min Yun: Exhibition & Education Department, Nakdonggang National Institute of Biological Resources, Sangju-si, Gyeongsangbuk-do 37242, Korea
Sang Deuk Lee: Microbial Research Department, Nakdonggang National Institute of Biological Resources, Sangju-si, Gyeongsangbuk-do 37242, Korea
Pyo Yun Cho: Animal & Plant Research Department, Nakdonggang National Institute of Biological Resources, Sangju-si, Gyeongsangbuk-do 37242, Korea
Seung Won Nam: Microbial Research Department, Nakdonggang National Institute of Biological Resources, Sangju-si, Gyeongsangbuk-do 37242, Korea
Dae Ryul Kwon: Microbial Research Department, Nakdonggang National Institute of Biological Resources, Sangju-si, Gyeongsangbuk-do 37242, Korea
Chung Hyun Choi: Department of Oceanography, Kunsan National University, Gunsan-si, Jeollabuk-do 54150, Korea
Jin-Young Kim: Animal & Plant Research Department, Nakdonggang National Institute of Biological Resources, Sangju-si, Gyeongsangbuk-do 37242, Korea
Jong-Suk Lee: Animal & Plant Research Department, Nakdonggang National Institute of Biological Resources, Sangju-si, Gyeongsangbuk-do 37242, Korea

Sustainability, 2020, vol. 12, issue 16, 1-13

Abstract: The construction of weirs causes changes in the aquatic environment and affects several aquatic organisms. To understand the ecosystem in the Sangju Weir, Gyeongsangbuk-do Province, variations in the spatiotemporal distribution and composition of microalgae communities were analyzed. Microalgae were collected fortnightly from April to November 2018 from six sites in the Nakdonggang River. There was significant variation in environmental factors, microalgal community structure, and flora. Microalgae communities were dominated by diatoms (e.g., Fragilaria crotonensis , Ulnaria acus , and Aulacoseira ambigua ), green algae (e.g., genera Eudorina and Desmodesmus ), cyanobacteria (e.g., genera Anabaena and Microcystis ). Multidimensional scaling indicated that species composition and diversity were generally similar among sites but varied between the bottom and the surface and middle water layers. Vertical migration of microalgae was difficult to investigate because of the thermocline in the study area and high turbidity in the lower layer. The distribution of microalgae was little affected by the construction of the weir, but the formation of thermocline changed microalgae communities in the water layer.

Keywords: aquatic ecosystem; species distribution; Sangju Weir; microalgae (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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