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

The Korean Society of Oceanography (한국해양학회)
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Seasonal Variations and Species Composition of Planktonic Ciliates in the Southern Coastal Waters of Jeju Island, Korea

제주도 남부해역의 부유성 섬모충류의 종 조성과 계절 변동

  • Published : 2003.05.01
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Abstract

As part of study on the microbial food web in the southern Jeju Island of Korea, Planktonic tintinnids and aloricate oligotrichs were investigated from July 1998 to June 2000 to understand seasonal variation and water mass indication with environmental factors. 39 species of tintinnids were identified representing 1 order, 11 families, 20 genera. Tintinnid abundance ranged from 100 to 5,400 cells.1$^{-1}$ (mean 314 cells.1$^{-1}$ ), and oceanic species were mainly dominant in fall and winter season, while neritic species were a little pre- dominant in spring and summer season. 15 species of aloricate oligotrichs were identified representing 1 order, 5 families, 7 genera, and many belonged to genus Strombidium which was most abundant and most frequently occurred in many months. Abundance of aloricate oligotrichs ranged from 140 to 21,000 cells.1$^{-1}$ (mean 2,356 cells.1$^{-1}$ ). Species diversity and standing crops of tintinnids were quite different according to seasons, but few seasonal variations were detected in aloricate oligotrichs. In terms of water mass indication tintinnids represented obvious characteristics which were affected by marine environmental factors, but alor- icate oligotrichs had no such apparent indication as tintinnids. Ciliates were more abundant and more diverse in inshore than in offshore station. Total carbon biomass of ciliates ranged from 0.01 to 136.06 $\mu\textrm{g}$C.1$^{-1}$ (mean 5.01 $\mu\textrm{g}$C.1$^{-1}$ ). The carbon biomass, however, did not coincided with seasonal variations of abun- dance Vertical profiles of mean abundance of both tintinnids and aloricate oligotrichs were similar, and had same trend as those of mean chlorophyll o concentration. It suggests that phytoplankton and ciliates reflected the prey-predator relationship in the study area.

제주도 남부해역의 미세생물 먹이망 구조에 관한 연구의 일환으로써 부유성 유종섬모충(tintinnids)과 빈섬모충(aloricate oligotrichs)의 종 조성과 생물량의 계절 변화 특성에 대하여 중문주변해역의 6개 정점에서 1998년 7월부터 2000년 6월까지 매월 조사를 실시하였다. 조사기간 동안 출현한 유종섬모충은 총 39종으로 세포수 범위는 100~5,400 cells. 1$^{-1}$(평균 314 cells . 1$^{-1}$) 이었고 가을철과 겨울철에는 외양성 종류가 주로 우점하였으며 봄철과 여름철은 외양성 보다 연안성 종류가 우세하였다. 빈섬모충은 총 15종이 동정되었고 세포수 범위는 140~21,000 cells.1$^{-1}$(평균 2,356 cells.1$^{-1}$)로써 Strombidium속의 종들이 전 계절에 걸쳐 우점하였다. 계절에 따른 종 다양성과 생물량 변화는 유종섬모충의 경우 차이가 컸지만 빈섬모충은 큰 차이가 없었다. 유종섬모충의 계절별 수괴지표 특성은 연구 해역의 해양환경변화에 따라 영향을 받고 있었으나 빈섬모충은 특이한 수괴지표 특성을 보이지 않았다. 해역별로 보면 외해역 보다는 해안역에서 세포수가 높았고 종 다양성도 높았다 섬모충의 총 탄소량의 범위는 0.01~136.06 $\mu\textrm{g}$C.1$^{-1}$(평균 5.01 $\mu\textrm{g}$C.1$^{-1}$)로 탄소량과 세포수의 월별 변동이 반드시 일치하지는 않았다. 유종섬모충과 빈섬모충의 수심별세포수 분포는 모두 20 m층에서 가장 높았고 수직분포의 경향도 비슷하였으며, 엽록소 a 량의 수직분포와도 일치하고 있어 식물플랑크톤과 섬모충은 피식과 포식의 상관성을 보이고 있었다.

Keywords

References

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