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Original Articles

Variation of Zooplankton Communities in Estuary by Opening/Closing the Sluice Gate of the Yeongsan River Dike, Korea

영산강 방조제 수문 개폐에 따른 하구역 동물플랑크톤 군집 변화

Min Ho Seo1†
,
Eun Ok Park2†
,
YongSik Sin3
,
Joo Yeon Youn4
,
Kyeong Yoon Kwak4
,
Ho Young Soh5*
서 민호1†
,
박 은옥2†
,
신 용식3
,
윤 주연4
,
곽 경윤4
,
서 호영5*
1Marine Ecology Research Center, Yeosu 59697, Korea
2Gwangju Jeonnam Research Institute, Naju 58217, Korea
3Department of Ocean System Engineering, Mokpo National Maritime University, Mokpo 58628, Korea
4Library of Marine Samples, Korea Institute of Ocean Science & Technology, Geoje 53201, Korea
5Division of Marine Technology, Chonnam National University, Yeosu 59626, Korea
1바다생태연구소㈜
2광주전남연구원
3목포해양대학교 해양시스템공학과
4한국해양과학기술원 해양시료도서관
5전남대학교 해양기술학부
*Corresponding Author
†These authors contributed equally to this work.
31 December 2021. pp. 127-141
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Abstract

The purpose of this study is to investigate how the changes in the amount of freshwater by opening and closing the sluice gate installed in the estuary embankment affect the community structure of zooplankton. Sampling was conducted 15 times in the Yeongsan River estuary located in the southwestern coast of Korea from February 2004 to January 2006. In low-salinity gradient regions around the gate, freshwater zooplankton was abundant after the gate opening. Still, the number of zooplankton species showed little difference compared to that in high-salinity gradient regions. Meanwhile, the zooplankton abundance was sharply decreased in mid-salinity gradient regions, and the low abundance was continued for several days, but the Chl-a concentration explosively increased. When the salinity concentration was stabilized after closing the gate, the abundance and the number of zooplankton species minutely increased around all study areas. It is considered that the stable salt content and the large amount of nutrients that flowed in on land affected the increase of Chl-a concentration and zooplankton communities. These facts indicate that the inflow of freshwater due to the opening and closing of floodgates can positively affect the increase in the number of zooplankton appearing in the long term. From these results, it is considered that freshwater flowed in by opening-closing of gate affects positively increasing of the number of emerged zooplankton species in the long term. In addition, species composition caused by freshwater inflow was restored at the point that salt concentration was stabilized, which shows that coastal copepods can adapt themselves actively to changes of salt concentration.

Keywords
coastal copepods
Freshwater zooplankton
opening-closing of gate
salinity
Yeongsan estuary

본 연구는 하구둑의 개폐에 따른 담수유입이 동물플랑크톤의 군집구조에 영향을 미치는지 알아보았다. 2004년 2월부터 2006년 1월까지 서남해안에 위치한 영산강 하구에서 15회에 걸쳐 조사를 실시하였다. 수문 주변의 저염분 지역에서는 수문 개방 후 담수 동물플랑크톤이 풍부 하였으나, 동물플랑크톤의 출현 분류군 수는 고염분 지역과 큰 차이는 없었다. 한편, 동물플랑크톤의 출현 개체수는 중염분 지역에서 급격히 감소하였다. 수문이 닫힌 후, 염분 농도가 안정됨에 따라 동물플랑크톤의 출현 개체수는 서서히 증가하는 것으로 나타났다. 이는 염분의 안정과 육상에서 다량 유입된 영양염이 식물플랑크톤 엽록소와 동물플랑크톤 군집 증가에 영향을 미친것으로 판단된다. 이와 같은 사실은 수문개폐에 의한 담수의 유입이 장기적으로는 동물플랑크톤의 출현 개체수 증가에 긍정적으로 작용할 수 있음을 보여주고 있다. 또한, 개방 후 담수 유입에 의한 종조성 변화는 염분 농도 변화가 안정되는 시점에 회복됨을 알 수 있었으며, 이는 연안성 요각류가 어느 정도의 농도 변화에 능동적으로 적응할 수 있음을 보여주고 있다.

키워드
담수 동물플랑크톤
수문 개폐
연안 요각류
염분
영산강
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Information
  • Publisher :The Korean Society of Phycology
  • Publisher(Ko) :한국조류학회
  • Journal Title :Aquatic Nature
  • Journal Title(Ko) :수생생물
  • Volume : 1
  • No :2
  • Pages :127-141
  • Received Date : 2021-12-03
  • Revised Date : 2021-12-14
  • Accepted Date : 2021-12-14
  • DOI :https://doi.org/10.23135/an.2021.1.2.4
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