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首页> 外文期刊>Estuarine Coastal and Shelf Science >Biological and physicochemical factors controlling short-term variability in phytoplankton primary production and photosynthetic parameters in a macrotidal ecosystem (eastern English Channel)
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Biological and physicochemical factors controlling short-term variability in phytoplankton primary production and photosynthetic parameters in a macrotidal ecosystem (eastern English Channel)

机译：控制巨潮生态系统中浮游植物初级生产的短期变异和光合参数的生物和物理化学因素（东英吉利海峡）

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摘要

Links between short-term variability of phytoplankton primary production and community structure changes have been studied rarely. This has been examined in a macrotidal ecosystem, the Baie des Veys (eastern English Channel, France), in 2003 and 2004, over the complete tidal cycle (semi-diurnal mode, 12 h). Within this area, primary production and photosynthetic parameter estimates, according to the ~(14)C incorporation technique, were supported by an exhaustive taxonomic study and measurements of physicochemical factors to illustrate the environmental framework. Related to the river Vire discharge, daily interactions between estuarine and bay waters were demonstrated. Depth-integrated primary production P_z was maximal around noon in the bay (48.7-68.0 mg Cm~(-2) h~(-1)) and decreased through the day in the mouth of the river. Photosynthetic parameters' variations and photoacclimation were influenced by the ecosystem variability level: short-term photoacclimation was possible in low mixing conditions. Changes in taxonomic composition according to tidal forcing led to variations in primary production levels. Large species, associated with high photosynthetic parameters, were observed in the bay, whereas small ones were present in the mouth of the river, when low primary production was measured. On a short-time scale, a positive relationship was observed between species diversity and primary production. This work emphasizes the need to focus on changes in phytoplankton community structure in order to understand short-term variability in primary production.
机译：浮游植物初级生产的短期变异性与群落结构变化之间的联系鲜有研究。 2003年和2004年，在整个潮汐周期（半日模式，12小时）内，在大潮生态系统Baie des Veys（法国东部英吉利海峡）中对此进行了检验。在该区域内，根据〜（14）C掺入技术，主要生产和光合参数估计得到了详尽的分类学研究和理化因子测量的支持，以说明环境框架。与河水排放有关，河口和海湾水之间的日常相互作用得到了证明。在海湾中午前后，深度综合初级生产力P_z最高（48.7-68.0 mg Cm〜（-2）h〜（-1）），并在河口全天下降。光合参数的变化和光适应受到生态系统可变性水平的影响：在低混合条件下可能短期光适应。根据潮汐强迫的生物分类组成的变化导致初级生产水平的变化。在海湾中观察到与高光合作用参数相关的大型物种，而当测量的初级产量较低时，在河口存在小型物种。在短时间内，观察到物种多样性与初级生产之间存在正相关关系。这项工作强调需要关注浮游植物群落结构的变化，以便了解初级生产中的短期变化。

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