Polar Biology

, Volume 30, Issue 10, pp 1285–1293 | Cite as

Structure of the summer under fast ice microbial community near Syowa Station, eastern Antarctica

  • Mutsuo Ichinomiya
  • Masaki Honda
  • Haruto Shimoda
  • Kenji Saito
  • Tsuneo Odate
  • Mitsuo Fukuchi
  • Akira Taniguchi
Original Paper


Temporal variations in the microbial community structure of plankton, which is composed of autotrophic and heterotrophic pico-, nano- and microplankton, were investigated during the austral summer of 2005/2006 under fast ice near Syowa Station, eastern Antarctica. Autotrophic algal populations were composed almost entirely of diatoms followed by phytoflagellates such as autotrophic dinoflagellates and cryptophytes. Among the microbial community, heterotrophic biomass was dominated by heterotrophic dinoflagellates and naked ciliates and finally exceeded autotrophic biomass. Qualitative microscopic analysis revealed that heterotrophic dinoflagellates were ingesting large number of diatoms. Synchronizing fluctuation of naked ciliates with phytoflagellates suggested a predator–prey relationship between them. Our results suggest that the pelagic food webs under the extensive ice-covered areas in coastal Antarctic regions are not short but complex.


Microbial structure Ice algae Protozoans Fast ice Syowa station 



We are grateful to the member of the 47th Japanese Antarctic Research Expedition party. We greatly thank Drs. M. Nakamachi and A. Otsuki for their helpful supports. Special thanks go to three reviewers for critically reading the manuscript.


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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Mutsuo Ichinomiya
    • 1
  • Masaki Honda
    • 2
  • Haruto Shimoda
    • 3
  • Kenji Saito
    • 4
  • Tsuneo Odate
    • 5
  • Mitsuo Fukuchi
    • 5
  • Akira Taniguchi
    • 6
  1. 1.School of agricultural scienceTohoku UniversitySendaiJapan
  2. 2.Central research institute of electric power industryChibaJapan
  3. 3.National maritime research instituteTokyoJapan
  4. 4.National institute of geneticsShizuokaJapan
  5. 5.National institute of polar researchTokyoJapan
  6. 6.Tokyo University of Agriculture OkhotskHokkaidoJapan

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