Riverine algal groups with distinct life histories can generate unique patterns of structural and functional behavior. As such, novel methods to discriminate between these groups can improve the understanding of river ecosystem processes. We examined benthic vs. planktonic contributions to suspended algal biomass by monitoring suspended chlorophyll concentration and turbidity during 48 storm events at 2 locations with contrasting hydraulic storage associated with low-head dams. Upstream from the dams, chlorophyll hysteresis showed concentrating effects and counterclockwise rotation, suggesting stormflow concentrated algae from benthic sources. When autotrophic conditions (P/R > 1) preceded storms, chlorophyll hysteresis switched to more proximal benthic sources (faster mobilization). Downstream of the dams, hysteresis showed greater dilution effects and more proximal sources of planktonic algae than at the upstream site, in contrast to high similarly in turbidity hysteresis between sites. Our study supports the analysis of chlorophyll and turbidity hysteresis to infer sources and transport of suspended algal biomass.

中文翻译：

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利用原位叶绿素传感器破译河流浮游植物的起源

具有不同生活史的河流藻类群可以产生独特的结构和功能行为模式。因此，区分这些群体的新方法可以提高对河流生态系统过程的理解。我们通过监测 2 个地点的 48 次风暴事件期间的悬浮叶绿素浓度和浊度来检查底栖生物与浮游生物对悬浮藻类生物量的贡献，并与低水头大坝相关的水力储存形成对比。在大坝上游，叶绿素滞后表现出集中效应和逆时针旋转，表明风暴流集中了来自底栖来源的藻类。当自养条件（P / R > 1) 在暴风雨之前，叶绿素滞后转向更近的底栖来源（更快的动员）。与上游站点相比，在大坝的下游，滞后现象显示出更大的稀释效应和更接近的浮游藻类来源，而站点之间的浊度滞后现象相似。我们的研究支持叶绿素和浊度滞后的分析，以推断悬浮藻类生物量的来源和运输。