The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY (한국해양학회지:바다)

The Korean Society of Oceanography (한국해양학회)
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Relationship Between Dinoflagellate Cyst Distribution in Surface Sediments and Phytoplankton Assemblages from Gwangyang Bay, a Southern Coastal area of Korea

한국 남해 연안 광양만 표층 퇴적물의 와편모조류 시스트 분포 특성과 식물플랑크톤 군집과의 비교

  • 김소영 (부경대학교 해양학과) ;
  • 문창호 (부경대학교 해양학과) ;
  • 조현진 (제주대학교 해양과환경연구소)
  • Published : 2003.05.01
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Abstract

To describe dinoflagellate cysts from Gwangyang Bay, surface sediment samples were collected at 20 sites by the TFO core sampler on 24 August 2001, in coupled with a phytoplankton investigation by surface seawater sampling. More than 17 genera, 36 species of dinoflagellate cysts were Identified from the sediment samples of Gwangyang Bay, consisting of 14 species of gonyaulacoid, 14 species of protoperidinioid, 3 species of diplopsalid, 2 species of gymnodinioid, 1 species of tuberculodinioid and calciodinellid, respectively. Cyst concentrations in Gwangyang Bay varied from 115 to 2,188 cysts/g, and generally increased toward a western part of the study area. The highest cyst concentration was observed at St. 11 located in the northwestern region with 11 genera and 19 species(2,188 cysts/g), while the lowest value with 6 genera and 9 species(115 cysts/g) was observed at St. 3 located in the center of the study area. The predominant dinoflagellate cyst was Spiniferites bulloideus, followed by Alexandrium sp., Brigantedinium simplex and S. delicatus. The motile forms of eight dinoflagellate cysts recorded in the sediment samples were also observed in the seawater: Polykrikos swartzii/kofoidii complex, Scripssiella trochoidea, Protoperidinium claudicans(cyst name: Votadinium spinosum), P. pentagonum(: Trinovantedinium capitatum capitatum), P. conicum(: Selenopemphix quanta), P. leonis(: Quinquecuspis concretum), P. conicoides(: Brigantedinium simplex), Gonyaulax spp.(: Spiniferites spp.). In this study, heterotrophic dinoflagellate cysts show the highest concentration at St. 6 where the highest density of diatoms simultaneously observed from surface water sample. This result suggests that the grazing of heterotrophic dinoflagellates on the diatoms in high concentration caused the higher concentration of heterotrophic dinoflagellate cysts.

광양만의 와편모조류 시스트를 연구하기 위하여 2001년 8월 24일 광양만의 20개 정점에서 TFO 채니기를 이용하여 표층 퇴적물과 식물플랑크톤 조사를 위한 표층 해수를 채수하였다. 퇴적물을 분석한 결과, 와편모조류 시스트는 gonyaulacoid 그룹 11종, protoperidinioid 그룹 13종, diplopsalid그룹 2종, gymnodinioid 그룹 2종, 그리고 tuberculodinioid그룹 1종, calciodinellid 그룹 1종으로 총 IT속 30종이 동정되었다. 와편모조류 시스트는 115∼2,188cysts/g의 농도로 분포하고 있었으며 , 전반적으로 조사해역의 서쪽으로 갈수록 증가하였다. 시스트 농도가 가장 높게 나타난 지역은 북서쪽에 위치한 정점 11로서, 11속 18종(2,188 cysts/g)의 시스트가 발견되었으며, 반면에 가장 낮게 나타난 지역은 조사해역의 중앙부에 위치한 정점 3으로, 6속 9종(115 cysts/g)의 시스트가 발견되었다. 가장 많이 발견된 와편모조류 시스트는 SPiniferites bulloideus였으며, Alexandrium sp., Brigantedinium simplex, S. delicatus 등이 우점하였다. 퇴적물 시료에 기록된 8종의 와편모조류 시스트의 유영세포가 해수 시료에서도 발견되었다: Polykrikos swartzii/kofoidii complex, Scripssiella trochoidea, Protoperidinium claudicans(cyst name: Votadinium spinosum), P. pentagonum(: Trinovantedinium capitatum capitatum), P. conicum(: Selenopemphix quanta), P. leonis(: Quinquecuspis concretum), P. conicoides(: Brigantedinium simplex), Gonyaulax spp.(: Spiniferites spp.). 본 연구에서 퇴적물 시료의 타가영양 와편모조류 시스트 농도가 가장 높은 정점과 표층 해수 시료의 규조류 현존량이 가장 높은 정점이 일치하였다. 이는 부영양화로 인해 영양염류가 증가한 해역에서 규조류가 많이 증식하고, 뒤이어 이를 먹이로 하는 타가영양 와편모조류도 증식함에 따라, 많은 양의 타가영양 와편모조류 시스트가 퇴적물에 집적되는 현상이 장기간에 걸쳐 진행된 결과로 생각된다 앞으로 해역의 부영양화와 퇴적물의 타가영양 와편모조류 시스트와의 관계를 보다 명확하게 규명하기 위해서는,표층수의 식물플랑크톤과 퇴적물의 와편모조류 시스트에 대한 장기간 모니터링에 따른 연속적 인 연구가 필요할 것으로 사료된다.

Keywords

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