...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine biology >Short-term variability and control of phytoplankton photosynthetic activity in a macrotidal ecosystem (the Strait of Dover, eastern English Channel)
【24h】

Short-term variability and control of phytoplankton photosynthetic activity in a macrotidal ecosystem (the Strait of Dover, eastern English Channel)

机译：巨潮生态系统（多佛海峡，英吉利海峡东部）中浮游植物光合作用的短期变化和控制

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Short-term changes in phytoplankton photo-synthetic activity were studied during different periods of the years 2009 and 2010 in the coastal waters of a macrotidal ecosystem (the Strait of Dover, eastern English Channel). During each sampling period, samples were taken every 1.45 h., from sunrise to sunset, during at least 5 days distributed along a complete spring-neap tide cycle. The photosynthetic parameters were obtained by measuring rapid light curves using pulse amplitude modulated fluorometry and were related to environmental conditions and phytoplankton taxonomic composition. The maximum quantum yield (F_v/F_m) showed clear light-dependent changes and could vary from physiological maxima (0.68-0.60) to values close to 0.30 during the course of 1 day, suggesting the operation of photoprotective mechanisms. The maximum electron transport rate (ETR_m) and maximal light utilization efficiency (α) were generally positively correlated and showed large diel variability. These parameters fluctuated significantly from hour to hour within each day and the intraday pattern of variation changed significantly among days of each sampling period. Stepwise multiple linear regressions analyses indicated that light fluctuations explained a part of this variability but a great part of variability stayed unexplained. F_v/F_m, ETR_m and α were not only dependent on the light conditions of the sampling day but also on those of the previous days. A time lag of 3 days in the effect of light on ETR_m and α variation was highlighted. At these time scales, changes in phytoplankton community structure seemed to have a low importance in the variability in photosynthetic parameters. The photoacclimation index E_k showed a lower variability and was generally different from the incident irradiance, indicating a limited acclimation capacity with a poor optimization of light harvesting during the day. However, in well-mixed systems such as the Strait of Dover, the short-term photoacclimation is disrupted by the high level of variability in environmental conditions. Also, the variability observed in the present study can be associated with a particular kind of photosynthetic response: the "E_k-independent" variability. The physiological basis of this photosynthetic response is largely unresolved and further researches on this subject are still required to better explain the dynamics of phytoplankton activity in the Strait of Dover.
机译：在2009年和2010年的不同时期，在巨潮生态系统的沿海水域（东英吉利海峡多佛海峡），研究了浮游植物光合活动的短期变化。在每个采样周期中，从日出到日落，每隔1.45 h采样一次，至少需要5天，沿着完整的春潮周期分布。通过使用脉冲幅度调制荧光法测量快速光曲线获得光合参数，这些参数与环境条件和浮游植物分类学组成有关。在1天的过程中，最大量子产率（F_v / F_m）显示出明显的光依赖性变化，并且可能从生理最大值（0.68-0.60）变化到接近0.30的值，这表明了光保护机制的运行。最大电子传输速率（ETR_m）和最大光利用效率（α）通常呈正相关，并且显示出较大的迪尔变异性。这些参数在每天的每个小时之间波动很大，并且在每个采样周期的几天之间，日内变化模式有很大变化。逐步多元线性回归分析表明，光波动解释了这种可变性的一部分，但很大一部分可变性仍无法解释。 F_v / F_m，ETR_m和α不仅取决于采样日的光照条件，而且还取决于前几天的光照条件。强调了光对ETR_m和α变化的影响的3天时滞。在这些时间尺度上，浮游植物群落结构的变化似乎对光合参数变异性的重要性不高。光适应指数E_k表现出较低的变异性，并且通常与入射辐照度不同，这表明适应能力有限，并且白天的采光效果欠佳。但是，在诸如多佛尔海峡等充分混合的系统中，短期的光适应被环境条件下的高度可变性所破坏。同样，在本研究中观察到的变异性可能与一种特殊的光合作用反应有关：“与E_k无关”的变异性。这种光合作用反应的生理基础在很大程度上尚未得到解决，仍然需要对该问题进行进一步的研究以更好地解释多佛尔海峡浮游植物活动的动态。

著录项

  • 来源
    《Marine biology》 |2013年第7期|1661-1679|共19页
  • 作者

    Emilie Houliez; Fabrice Lizon; Sebastien Lefebvre; Luis Felipe Artigas; Francois G. Schmitt;

  • 作者单位

    Laboratoire d'Oceanologie et de Geosciences, CNRS, Universite Lille Nord de France, Universite des Sciences et Technologies de Lille, Lille 1, UMR 8187, Station Marine de Wimereux,28 Avenue Foch, 62930 Wimereux, France;

    Laboratoire d'Oceanologie et de Geosciences, CNRS, Universite Lille Nord de France, Universite des Sciences et Technologies de Lille, Lille 1, UMR 8187, Station Marine de Wimereux,28 Avenue Foch, 62930 Wimereux, France;

    Laboratoire d'Oceanologie et de Geosciences, CNRS, Universite Lille Nord de France, Universite des Sciences et Technologies de Lille, Lille 1, UMR 8187, Station Marine de Wimereux,28 Avenue Foch, 62930 Wimereux, France;

    Laboratoire d'Oceanologie et de Geosciences, CNRS, Universite Lille Nord de France, Universite du Littoral Cote d'Opale, UMR 8187, Maison de la Recherche en Environnement Naturel,32 Avenue Foch, 62930 Wimereux, France;

    Laboratoire d'Oceanologie et de Geosciences, CNRS, Universite Lille Nord de France, Universite des Sciences et Technologies de Lille, Lille 1, UMR 8187, Station Marine de Wimereux,28 Avenue Foch, 62930 Wimereux, France;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号