Effects of Nakdong River Estuary Barrage discharge on mesozooplankton community structure: opening of weirs in Nakdong River

Title
Effects of Nakdong River Estuary Barrage discharge on mesozooplankton community structure: opening of weirs in Nakdong River
Author(s)
Kim, Minju; Kang, Jung Hoon
KIOST Author(s)
Kim, Min Ju(김민주)Kang, Jung Hoon(강정훈)
Publication Year
2020-07-23
Abstract
We investigated the mesozooplankton community structure and environmental variables in the Nakdong River Estuary during three periods in 2017. The periods were before and after opening of the four weirs (Gangjeong-Goryeong, Dalsung, Hapcheon-Changnyeong, Changnyeong-Haman) in the lower Nakdong River. The mesozooplankton and environmental factors (temperature, salinity, chlorophyll-a) were sampled before (May) and after (5 and 42 days; June and July, respectively) opening of weirs. The average daily discharge of Nakdong River Estuary Barrage (NREB) was relatively lower in June (38.6 m3s-1) than May and July. The mesozooplankton abundance was relatively higher by 5 times in May than in June and July, in which Noctiluca scintillans were dominant. In June, cladocerans (Podon schmackeri) were dominant species in the brackish region, while cladocerans (Daphnia cuculata and D. hyalina) prevailed throughout freshwater region. In July, cladocerans (Penilia avirostris) were dominant in the brackish to seawater region. These results indicated that considerable spatiotemporal heterogeneity of mesozooplankton community among study area depends on the management of freshwater discharge of weirs and barrage opening. Consequently based on the findings of this research, we can understand better of zooplankton distribution in the regulated river estuary barrage system as basic information for managerial actions.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/32875
Bibliographic Citation
2020년도 한국해양과학기술협의회 공동학술대회 (한국해양학회), 2020
Publisher
한국해양과학기술협의회
Type
Conference
Language
Korean
Publisher
한국해양과학기술협의회
Related Researcher
Research Interests

Biological oceanography,Zooplankton ecology,Introduction and dispersion of foreign species,생물해양학,동물플랑크톤 생리,생태,외래종 유입,확산

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