Studies on the dynamics of pico- and nanophytoplankton in oligotrophic oceans in relation to nutrient availability

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  • Sato Mitsuhide
    Graduate School of Agricultural and Life Sciences, The University of Tokyo

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Other Title
  • 貧栄養海域におけるピコ・ナノプランクトン 栄養動態に関する研究
  • 2016年度日本海洋学会岡田賞受賞記念論文 貧栄養海域におけるピコ・ナノプランクトン栄養動態に関する研究
  • 2016ネンド ニホン カイヨウ ガッカイ オカダショウ ジュショウ キネン ロンブン ヒンエイヨウ カイイキ ニ オケル ピコ ・ ナノプランクトン エイヨウ ドウタイ ニ カンスル ケンキュウ

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Abstract

<p>Pico- and nanophytoplankton are important primary producers in the open ocean and form the foundations of food webs. The author has studied the composition and spatial distribution, nutrient acquisition and grazing loss of pico- and nanophytoplankton. First, the spatial distribution and size composition of pico- and nanophytoplankton have been revealed by flow cytometry and related with their physiological characteristics and environmental factors. Second, the author focused on the utilization of phosphorus and iron, as a driving factor of pico- and nanophytoplankton community formation, with special emphasis on organic phosphorus compounds and organic iron complexes, and obtained some novel insights from field experiments. Third, a new methodology was investigated to estimate the grazing rates of different microzooplankton groups on pico- and nanophytoplankton based on the size-fractionation method. These results were used to study the characteristic nutrient acquisition strategies of pico- and nanophytoplankton in the open oligotrophic ocean.</p>

Journal

  • Oceanography in Japan

    Oceanography in Japan 26 (1), 1-13, 2017-01-15

    The Oceanographic Society of Japan

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