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Analysis of Harmful Cyanobacteria Occurrence Characteristics and Effects of Environmental Factors

덕동호 유해남조류 출현 특성 및 환경요인 영향 분석

  • Dong-Gyun Hong (Nakdong River Environment Research Center, National Institute of Environmental Research) ;
  • Hae-Kyung Park (Nakdong River Environment Research Center, National Institute of Environmental Research) ;
  • Yong-jin Kim (Nakdong River Environment Research Center, National Institute of Environmental Research)
  • 홍동균 (국립환경과학원 낙동강물환경연구소) ;
  • 박혜경 (국립환경과학원 낙동강물환경연구소) ;
  • 김용진 (국립환경과학원 낙동강물환경연구소)
  • Received : 2022.01.19
  • Accepted : 2022.12.28
  • Published : 2023.01.30

Abstract

This study analyzed the relationship between harmful cyanobacterial abundance and environmental factors in order to figure out the causes of the recent increase of cyanobacteria in Lake Dukdong from 2019 to 2021. Lake Dukdong, which is used as a drinking water source for Gyeongju City, has an algae alert system in place. Lake Dukdong has maintained good water quality, but algae alert level 1 (over 1,000 cells/mL) has been issued in recent years. As a result of Pearson correlation analysis (from May to Oct.), the cell density of Microcystis and Aphanizomenon, which form part of the most harmful cyanobacteria genus, were significantly positively correlated with the water temperature and water storage volume. T-test was performed to compare the data from 2016-2018 and 2019-2021 (from May to Oct.). The average density of harmful cyanobacteria cells increased about six-fold from 54 to 344 cells/mL. There were significant differences in water temperature, pH, total nitrogen (TN), total phosphorus (TP), TN/TP ratio, water storage volume, and cyanobacterial cell density. Water temperature increased from 19.2 to 22.8 ℃. TP concentration increased from 0.017 to 0.028 mg/L. The main cause of the recent increase of harmful cyanobacteria in Lake Dukdong is thought to be the increase in water temperature, TP concentration, and water storage volume from 2019 and 2021, resulting in more favorable conditions for cyanobacterial growth.

Keywords

Acknowledgement

본 논문은 환경부의 재원으로 국립환경과학원의 지원을 받아 수행하였습니다(NIER-2018-03-03-003).

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