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首页> 外文期刊>Marine biology >Rapid light curves (RLC) or non-sequential steady-state light curves (N-SSLC): which fluorescence-based light response curve methodology robustly characterizes phytoplankton photosynthetic activity and acclimation status?
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Rapid light curves (RLC) or non-sequential steady-state light curves (N-SSLC): which fluorescence-based light response curve methodology robustly characterizes phytoplankton photosynthetic activity and acclimation status?

机译：快速光曲线（RLC）或非连续稳态光曲线（N-SSLC）：哪种基于荧光的光响应曲线方法能够可靠地表征浮游植物的光合作用和适应状况？

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This study is the first in situ work comparing rapid light curves (RLC) and non-sequential steady- state light curves (N-SSLC) in their efficiency to characterize phytoplankton photosynthetic activity and acclimation status. Measurements were carried out at two time scales (daily and annual) using the Pulse Amplitude Modulated fluorometry on samples taken in the coastal waters of a macrotidal ecosystem (the Strait of Dover, eastern English Channel). RLC and N-SSLC were compared under a wide range of environmental conditions and phytoplankton composition in order to define the best methodology to accurately capture short and long-term adjustments in the functioning of the photosynthetic apparatus. The relationships between the photosynthetic parameters extracted from RLC and N-SSLC were also studied to evaluate the possibility to use RLC to predict N-SSLC photosynthetic parameters and thus obtaining the acclimation status at steady state. At daily scale, the maximum electron transport rate and light saturation coefficient resulting from RLC (respectively, ETRm RLC and E-k RLC) were found to follow more closely short-term environmental light variations than -ETRm and E-k resulting from N-SSLC -(ETRm N-SSLC and E-k N-SSLC) did. RLC were thus able to detect rapid changes in photosynthetic activity that would have been overlooked with N-SSLC measurements. At annual scale, few differences were found between RLC and N-SSLC. Variations of -ETRm and a derived from RLC and N-SSLC were very similar but absolute values were lower for RLC measurements. Because, at daily scale, RLC better capture the short-term changes in photosynthetic activity than N-SSLC do, using RLC to predict N-SSLC photosynthetic parameters and getting information about steady-state acclimation status is not possible at this time scale. However, this can be done at seasonal scale.
机译：这项研究是第一个比较快速光曲线（RLC）和非顺序稳态光曲线（N-SSLC）的效率的特征，以表征浮游植物的光合作用和适应状况。使用脉冲幅度调制荧光分析法在两个大尺度上（每天和每年）对在巨潮生态系统（多佛海峡，东英吉利海峡）沿海水域采集的样品进行测量。在广泛的环境条件和浮游植物组成下对RLC和N-SSLC进行了比较，以定义最佳方法，以准确捕获光合装置功能的短期和长期调整。还研究了从RLC提取的光合参数与N-SSLC之间的关系，以评估使用RLC预测N-SSLC的光合参数，从而获得稳态下的驯化状态的可能性。在日尺度上，发现RLC（分别为ETRm RLC和Ek RLC）产生的最大电子传输速率和光饱和系数比N-SSLC-（ETRm N-SSLC和Ek N-SSLC）。因此，RLC能够检测到光合活性的快速变化，而N-SSLC测量却忽略了这一变化。在年度范围内，RLC和N-SSLC之间几乎没有差异。 -ETRm的变化以及源自RLC和N-SSLC的变化非常相似，但RLC测量的绝对值较低。因为在每日范围内，RLC比N-SSLC更好地捕获了光合作用的短期变化，因此使用RLC预测N-SSLC的光合参数，并且在此时间范围内无法获取有关稳态适应状态的信息。但是，这可以按季节进行。

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  • 来源
    《Marine biology》 |2017年第8期|175.1-175.17|共17页
  • 作者

    Houliez Emilie; Lefebvre Sebastien; Lizon Fabrice; Schmitt Francois G.;

  • 作者单位

    Univ Lille 1, Univ Littoral Cote dOpale, CNRS, UMR 8187,LOG, F-62930 Wimereux, France|Univ La Rochelle, ILE, CNRS, UMR LIENSs 6250, 2 Rue Olympe de Gouges, F-17042 La Rochelle, France;

    Univ Lille 1, Univ Littoral Cote dOpale, CNRS, UMR 8187,LOG, F-62930 Wimereux, France|IFREMER, Lab Ressources Halieut, 150 Quai Gambetta,BP 699, F-62321 Boulogne Sur Mer, France;

    Univ Lille 1, Univ Littoral Cote dOpale, CNRS, UMR 8187,LOG, F-62930 Wimereux, France;

    Univ Lille 1, Univ Littoral Cote dOpale, CNRS, UMR 8187,LOG, F-62930 Wimereux, France;

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