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首页> 外文期刊>Marine biology >Relationships between light environment and subsurface accumulation during the daytime in the red-tide dinoflagellate Karenia mikimotoi
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Relationships between light environment and subsurface accumulation during the daytime in the red-tide dinoflagellate Karenia mikimotoi

机译：赤潮甲鞭毛克雷伯氏菌白天白天光环境与地下蓄积的关系

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摘要

Diurnal vertical migration of the red-tide dinoflagellate Karenia mikimotoi and environmental conditions were measured in Hiroshima Bay and the Yatsushiro Sea in July of 2012 and 2015, respectively. The uppermost daytime depths for K. mikimotoi were 1.3-6.0 m and did not correspond to the pycnocline; most cells reached the bottom each night. Although the incident photosynthetic photon flux density (PPFD) varied among days, average PPFDs at the mean cell distribution depths were similar (5965 mu mol m(-2) s(-1)) between compensation and saturation PPFDs for photosynthesis. Total daily PPFD at the mean depth was between the growth threshold and that for maximum growth rates. Among visible wavelengths, the photon flux density of green and yellow light (500-600 nm) at the mean depth was major (about 61% of the total), and the PFD of blue (400-500 nm) was always relatively minor (about 20%). Laboratory results identified green light as sufficient for K. mikimotoi growth, yielding growth rates equivalent to those under blue light. This study suggests that the vertical cell distribution depth during the daytime is regulated by underwater light transmission and that green light is valuable for growth and photosynthesis of K. mikimotoi.
机译：分别于2012年7月和2015年7月在广岛湾和八代海测量了赤潮小鞭毛拟青蟹（Karenia mikimotoi）的日垂直迁移和环境条件。 mikimotoi K.的最高日间深度为1.3-6.0 m，并不对应于比浓菌碱；大多数牢房每晚都到达最低点。尽管入射光合作用的光子通量密度（PPFD）随天变化，但在平均细胞分布深度处的平均PPFD在光合作用的补偿和饱和PPFD之间是相似的（5965μmol m（-2）s（-1））。平均深度的每日PPFD总量介于生长阈值和最大增长率之间。在可见波长中，平均深度的绿光和黄光（500-600 nm）的光子通量密度较大（约占总数的61％），而蓝光（400-500 nm）的PFD始终相对较小（约20％）。实验室结果确定，绿光足以满足三叶K. kimi的生长需求，其生长速率与蓝光相当。这项研究表明白天的垂直细胞分布深度受水下光传输的调节，而绿光对于三叶锦葵的生长和光合作用是有价值的。

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  • 来源
    《Marine biology》 |2017年第1期|18.1-18.12|共12页
  • 作者

    Shikata Tomoyuki; Onitsuka Goh; Abe Kazuo; Kitatsuji Saho; Yufu Kei; Yoshikawa Yutaka; Honjo Tsuneo; Miyamura Kazuyoshi;

  • 作者单位

    Japan Fisheries Res & Educ Agcy, Natl Res Inst Fisheries & Environm Inland Sea, Maruishi 2-17-5, Hiroshima 7390452, Japan;

    Japan Fisheries Res & Educ Agcy, Natl Res Inst Fisheries & Environm Inland Sea, Maruishi 2-17-5, Hiroshima 7390452, Japan;

    Japan Fisheries Res & Educ Agcy, Natl Res Inst Fisheries & Environm Inland Sea, Maruishi 2-17-5, Hiroshima 7390452, Japan;

    Japan Fisheries Res & Educ Agcy, Natl Res Inst Fisheries & Environm Inland Sea, Maruishi 2-17-5, Hiroshima 7390452, Japan;

    Kyushu Univ, Appl Mech Res Inst, 6-1 Kasuga Koen, Fukuoka 8168580, Japan;

    Kyoto Univ, Grad Sch Sci, Div Earth & Planetary Sci, Sakyo Ku, Kyoto 6068502, Japan;

    Kagawa Univ, Seto Inland Sea Reg Res Ctr, Saiwaicho 1-1, Takamatsu, Kagawa 7608521, Japan;

    Oita Prefectural Agr Forestry & Fisheries Res Ctr, Saiki, Oita 8792602, Japan;

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