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Distribution of Dinoflagellate Cysts in Surface Sediments of the Coastal Areas around Jeju Island, Korea

제주 해안주변해역 표층퇴적물 중 와편모조류 시스트 군집의 분포특성

  • Park, Bokyung (Department of Environmental Oceanography, Graduate School of Chonnam National University) ;
  • Kim, Yoonjeong (Department of Environmental Oceanography, Graduate School of Chonnam National University) ;
  • Yoon, Yang Ho (School of Marine Technology, Chonnam National University)
  • 박보경 (전남대학교 대학원 환경해양학과) ;
  • 김윤정 (전남대학교 대학원 환경해양학과) ;
  • 윤양호 (전남대학교 해양기술학부)
  • Received : 2016.09.12
  • Accepted : 2016.11.07
  • Published : 2016.11.25

Abstract

This study describes the spatial distribution of dinoflagellate cyst assemblages from the fishing ports along Jeju Island. Surface sediment samples from 22 stations revealed the occurrence of 29 species involving the Groups Protoperidinioid (44.8%), Gonyaulacoid (31.0%), Calciodineloid (10.3%), Gymnodinioid (6.9%), Diplosalid (3.5%) and Tuberculodinioid (3.5%). The cyst abundance recorded here is very low ($13{\sim}220cysts\;g-dry^{-1}$) as compared to Korean coastal regions. The abundance of heterothophic cysts increased in several fishing pots with fine sediments and anthropogenic tidal pools. And cyst abundance was well correlated with the grain-size composition of surface sediments. The dinoflagellate cyst assemblages in Jeju fishing ports were characterized by the dominant species, cyst of Gymnodinium sp., cyst of Pyrodinium bahamense and cyst of Scrippsiella trochoidea in 2012, Protoperidinium sp. (Brigantedinium sp.), cyst of Scrippsiella sp./trochoidea and cyst of Gymnodinium sp. in 2014, and Protoperidinium sp. (Echinidinium sp. and Brigantedinium sp.) in 2016. The advent of the toxic dinoflagellate, Pyrodinium bahamense were recorded for the first time in Jeju coastal waters. As a results, we are determined should be to monitoring and management measures for new toxic dinoflegallates from tropical or subtropical reigions and anthropogenic tidal pools by industrial activities.

제주 해안선 주변 항만 표층퇴적물의 와편모조류 시스트 군집구조를 파악하기 위하여, 제주 해안을 따라 위치하는 22곳의 항만을 대상으로 2012년에서 2016년까지 격년단위로 3회 조사하였다. 조사는 소형 에크만 채니기를 이용하여 0~2 cm 두께의 표층퇴적물 표본을 채집하였다. 분석결과 출현이 확인된 와편모조류 시스트는 6그룹 9속 29종으로 Protoperidinioid Group이 13종으로 44.8%의 점유율을, Gonyaulacoid Group이 9종으로 31.0%, Calciodineloid Group이 3종으로 10.3%, Gymnodinioid Group이 2종으로 6.9%, Tuberculodinoid Group과 Diplosalid Group이 각각 1종으로 3.5%의 점유율을 보였다. 또한 정점에 따른 변화는 1~6 종으로 매우 낮았다. 시스트의 세포밀도는 13~220 cysts/g dry의 범위로 낮지만, 퇴적물의 함수율과 유의적인 회귀식을 나타내었다. 또한 일부 세립퇴적물을 나타내는 항만 및 개발에 의해 인위적으로 형성된 조수웅덩이에서는 종속영양종 출현비가 높아, 오랜 시간 유기물이 퇴적되고 있음을 시사하였다. 우점종은 cyst of Gymnodinium sp 및 Protoperidinium 속 시스트가 최우점하였고, 이외 cyst of Pyrodinium bahamense, cyst of Scrippsiella trochoidea 등이 우점 출현하였다. 특히 열대 및 아열대성 유독와편모조인 P. bahamense 시스트는 제주연안에서 처음 기록되는 종으로 제주 해안주변해역의 인위적 조수웅덩이 등의 해역 수질환경 및 열대나 아열대에서 유입되는 새로운 유독와편모조류에 대한 모니터링 및 관리방안 수립이 시급한 것으로 판단되었다.

Keywords

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