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<p>Filter-feeding bivalves have been used to control algal blooms in aquatic ecosystems, but their effectiveness in regulating phytoplankton at different nutrient levels remains poorly understood, especially in (sub)tropical lakes. To evaluate the effect of bivalves (<i>Hyriopsis cumingii</i>) on phytoplankton biomass at different nutrient levels, a mesocosm experiment was conducted in nutrient-enriched and non-enriched systems, with and without bivalves. Our results showed that bivalves did not affect phytoplankton biomass (i.e., chlorophyll <i>a</i> (Chl <i>a</i>)) in the non-enriched systems. However, in the nutrient-enriched systems, the presence of bivalves negatively affected total nitrogen, total dissolved nitrogen, Chl <i>a</i> concentration, and the ratio of Chl <i>a</i> to total phosphorus in the water column. Moreover, bivalves significantly altered zooplankton community composition but did not increase zooplankton grazing pressure (indicated by the zooplankton:phytoplankton biomass ratio) in any of the treatments. Our results suggest that the effect of bivalves on the zooplankton community and phytoplankton biomass depends on the nutrient level.</p>

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The effect of bivalves on the zooplankton community and phytoplankton biomass depends on the nutrient level

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • Zong’an Jin,
  • Caiwen Zheng,
  • Baoyan Gao,
  • Ren Hu,
  • Irina Feniova,
  • Maciej Karpowicz,
  • Erik Jeppesen,
  • Lars G. Rudstam,
  • Zhengwen Liu,
  • Hui Jin,
  • Xiufeng Zhang

摘要

Filter-feeding bivalves have been used to control algal blooms in aquatic ecosystems, but their effectiveness in regulating phytoplankton at different nutrient levels remains poorly understood, especially in (sub)tropical lakes. To evaluate the effect of bivalves (Hyriopsis cumingii) on phytoplankton biomass at different nutrient levels, a mesocosm experiment was conducted in nutrient-enriched and non-enriched systems, with and without bivalves. Our results showed that bivalves did not affect phytoplankton biomass (i.e., chlorophyll a (Chl a)) in the non-enriched systems. However, in the nutrient-enriched systems, the presence of bivalves negatively affected total nitrogen, total dissolved nitrogen, Chl a concentration, and the ratio of Chl a to total phosphorus in the water column. Moreover, bivalves significantly altered zooplankton community composition but did not increase zooplankton grazing pressure (indicated by the zooplankton:phytoplankton biomass ratio) in any of the treatments. Our results suggest that the effect of bivalves on the zooplankton community and phytoplankton biomass depends on the nutrient level.