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<p>Resource use efficiency (RUE) is a crucial ecological indicator to assess nutrient uptake by phytoplankton and grazing by zooplankton. This study estimated the RUE of plankton communities and quantified the relative effects of nutrient levels and physical and chemical factors on RUE in the Fu River to Poyang Lake continuum, revealing significant spatiotemporal differences. Phytoplankton RUE was significantly higher in rivers than that in lakes, while zooplankton RUE was higher in lakes than in rivers. Additionally, RUE was higher during normal and wet seasons compared to dry season. Linear mixed-effects models revealed that eutrophication are the key drivers of phytoplankton RUE in both rivers and lakes, showing negative correlations with Trophic Level Index (TLI) in the river, and with phosphate and nitrate-nitrogen in the lake. Zooplankton RUE is mainly driven by discharge and nitrite-nitrogen in river and lake systems, respectively. These insights underscore the remarkable ecological flexibility of plankton and further offer in-depth valuable perspectives to enhance river and lake water quality, controlling nutrient pollution and enhancing ecological functions.</p>

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Eutrophication drives resource use efficiency variations in freshwater plankton communities across river–lake continuum in China’s Poyang Lake Basin

  • 期刊论文

  • 发表日期：

    2025年7月8日

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  • Yuan Wu,
  • Wei Yang,
  • Jutao Liu,
  • Xiaoxiao Li,
  • Baoshan Cui

摘要

Resource use efficiency (RUE) is a crucial ecological indicator to assess nutrient uptake by phytoplankton and grazing by zooplankton. This study estimated the RUE of plankton communities and quantified the relative effects of nutrient levels and physical and chemical factors on RUE in the Fu River to Poyang Lake continuum, revealing significant spatiotemporal differences. Phytoplankton RUE was significantly higher in rivers than that in lakes, while zooplankton RUE was higher in lakes than in rivers. Additionally, RUE was higher during normal and wet seasons compared to dry season. Linear mixed-effects models revealed that eutrophication are the key drivers of phytoplankton RUE in both rivers and lakes, showing negative correlations with Trophic Level Index (TLI) in the river, and with phosphate and nitrate-nitrogen in the lake. Zooplankton RUE is mainly driven by discharge and nitrite-nitrogen in river and lake systems, respectively. These insights underscore the remarkable ecological flexibility of plankton and further offer in-depth valuable perspectives to enhance river and lake water quality, controlling nutrient pollution and enhancing ecological functions.