Riverine phytoplankton shifting along a lentic-lotic continuum under hydrological, physiochemical conditions and species dispersal.
Riverine phytoplankton shifting along a lentic-lotic continuum under hydrological, physiochemical conditions and species dispersal.
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DOI：
10.1016/j.scitotenv.2017.10.139
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发表时间：
2017-10
期刊：
影响因子：
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通讯作者：
Yueming Qu;N. Wu;B. Guse;N. Fohrer
中科院分区：
文献类型：
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作者：
Yueming Qu;N. Wu;B. Guse;N. Fohrer
在受多种环境因素影响的低地河流中，基于植物生长调节素的生物评价的重要性近年来得到了重视。然而，一些基本的问题仍然不清楚，如：（i）浮游植物的时空变化，（ii）上游湖泊对下游社区的影响，（iii）物种组成的主要驱动力或（iv）区域生物多样性沿着一个湖泊连续体。为了回答这些问题，我们收集和分析了河流浮游植物群落沿着从德国低地集水区，在那里一个完善的生态水文模型预测在每个采样点的长期排放量的一个连续体。结果表明，浮游植物群落具有很强的时空变异性。湖泊对下游浮游植物群落的影响是显著的，尤其是湖泊下游最近的河段。然而，这些影响沿着随季节变化，并限制在相对较短的距离湖。红层分析和Mantel检验表明，浮游植物组成和沿着连续体的差异更多地归因于当地的水文和物理化学变量，而不是物种扩散，这证实了基于低地浮游植物的生物评价的适用性。此外，我们的研究结果强调了流态在塑造浮游植物群落组成和区域β-diabetes的重要性。本研究强调在未来的生物监测调查中，包括水文变量及其与浮游植物群落的关系的必要性。
The importance of phytoplankton-based bio-assessment has been recently recognized in lowland rivers which are affected by multi-environmental factors. However, some basic questions remain unclear to date, such as: (i) spatial and temporal variations of phytoplankton, (ii) the impact of upstream lakes on downstream community, (iii) the main drivers for species composition or (iv) the regional biodiversity along a lentic-lotic continuum. To answer these questions, we collected and analyzed the fluvial phytoplankton communities along a lentic-lotic continuum from a German lowland catchment, where a well-established ecohydrological modeling predicted long-term discharges at each sampling site. Our results revealed very high spatial and temporal variations of phytoplankton community. The changes of a lake on downstream phytoplankton assemblages were significant, especially the nearest reach after the lake. However, these influences varied along with seasons and limited in a relatively short distance to the lake. Redundancy analysis and Mantel tests showed that phytoplankton composition and dissimilarities along the lentic-lotic continuum attributed more to local hydrological and physicochemical variables than species dispersal, which confirmed the suitability of lowland phytoplankton-based bioassessment. In addition, our findings highlighted the importance of flow regime in shaping phytoplankton community composition and regional beta diversities. This study emphasized the necessity to include the hydrological variables and their relationship with phytoplankton community in future bio-monitoring investigations.