Diel periodicity of cell division and growth rates of marine oligotrich ciliates

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  • Ota Takashi
    Department of Biological Engineering, Ishinomaki Senshu University

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  • 海産少毛類繊毛虫の細胞分裂周期と増殖能
  • カイサン ショウモウルイ センモウチュウ ノ サイボウ ブンレツ シュウキ ト ゾウショクノウ

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Abstract

<p>Oligotrich ciliates are recognized to be a conspicuous component of microzooplanktonic assemblages in marine habitats. It has become obvious that perform multiple functions in the marine ecosystems such as a primary consumer of pico-and nano-sized producers, a significant nutrient regenerator and important food sources of metazoan zooplankton. To evaluate their functional role in the ecosystems, accurate estimates of growth and reproduction of organisms is indispensable. Cell cycle method including frequency of dividing cells (FDC) method is possibly one of the best too to estimate the growth rate of the ciliates in situ. This method have been successfully applied for several types of planktonic organisms, however, not attempted for oligotrichs because information of diel division pattern of the natural populations had not been available yet. Therefore, an attempt to obtain such basic data was made in this study. As a result, diel division patterns were successfully defined for several natural populations of oligotrichs in the oceanic waters and finally growth rate of the natural populations were determined.</p>

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