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

The Korean Society of Oceanography (한국해양학회)
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Influence of Mesozooplankton on the Grazing Pressure of Planktonic Ciliates in Sihwa Lake During Summer

시화호에서 하계 섬모충류의 초식압에 미치는 중형동물플랑크톤의 영향

  • 홍현표 ((주)한국연안환경생태연구소) ;
  • 최중기 (인하대학교 해양학과)
  • Received : 2014.05.19
  • Accepted : 2014.10.16
  • Published : 2014.11.28
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Abstract

We performed dilution experiments together with copepod added incubations to examine the influence of mesozooplankton on the grazing pressure of planktonic ciliates in Sihwa lake during summer when the abundances of phytoplankton and mesozooplankton increased considerably. Planktonic ciliates consumed 104% of primary production in a day on dilution experiments. However, the ciliates consumption on phytoplankton was reduced to 19% in copepod incubations with Acartia sinjiensis added. This was due to selective predation of A. sinjiensis on oligotrich ciliates ($>20{\mu}m$) which were major grazers on nano-phytoplankton. Our experiments show that grazing pressure of planktonic ciliates based on dilution experiments may be overestimated when the abundance of planktonic ciliates is strongly controlled by copepods. We postulate that the role of planktonic ciliates as grazers could diminish in Sihwa lake in spring and summer when abundance of copepods increase considerably. We suggest that the predation of mesozooplankton should be considered to better appraise the role of planktonic ciliates as grazers.

시화호에서 식물플랑크톤 및 섬모충류의 포식자인 중형동물플랑크톤 개체수가 크게 증가하는 하계에 섬모충류의 초식압에 미치는 중형동물플랑크톤의 영향을 파악하기 위해 희석실험과 요각류 첨가 배양 실험을 병행하였다. 희석실험에서 섬모충류는 식물플랑크톤 생산량의 104%를 하루에 소비하였으나, 요각류 Acartia sinjiensis를 첨가한 실험구에서 섬모충류의 초식압은 19%로 크게 감소하였다. 이는 미소형식물플랑크톤의 주요 초식자인 $>20{\mu}m$ 빈섬모충류에 대한 중형동물플랑크톤의 선택적 섭이에 기인하는 것으로, 중형동물플랑크톤에 의해 섬모충류의 개체수가 강하게 지배되는 시기에는 섬모충류의 실제 초식압은 과대평가될 수 있음을 의미한다. 따라서 시화호에서 요각류 개체수가 크게 증가하는 춘계와 하계에는 식물플랑크톤의 초식자로서 섬모충류의 역할은 크게 감소될 것으로 판단되며, 초식자로서 섬모충류의 역할을 더 정확하게 평가하기 위해서는 섬모충류에 대한 중형동물플랑크톤의 포식압을 반드시 고려해야 할 것으로 보인다.

Keywords

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