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<p>Climate change is projected to increase the influx of allochthonous dissolved organic carbon (DOC) into shallow lakes worldwide, altering the physicochemical environment and primary producer communities. These lake ecosystems are mainly characterized by the alternative dominance of submerged macrophytes, periphyton, or phytoplankton. However, our understanding of the ecological effects of DOC on these organisms and their interactions remains limited. We conducted a microcosm experiment to examine how elevated DOC inputs, which lead to lake browning, can affect the growth and relative dominance of submerged macrophytes (<i>Elodea nuttallii</i> and <i>Myriophyllum aquaticum</i>), periphyton and phytoplankton. Results showed that DOC inputs generally inhibited the growth of both periphyton and macrophytes, although periphyton exhibited greater tolerance to light limitation under moderate DOC concentrations. In contrast, phytoplankton biomass (chlorophyll a) increased with increasing DOC inputs. Our findings indicate that primary producers competing for light and nutrients exhibit varying sensitivities to increasing DOC (macrophytes &gt; periphyton &gt; phytoplankton) and these differential responses can influence their competitive dynamics. Nutrients and phytoplankton biomass increased with increasing DOC inputs, leading to a decoupling of ecosystem processes at higher DOC concentrations. These results provide important insights for active management of DOC to maintain the desired ecological state of shallow lakes.</p>

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Increased allochthonous dissolved organic carbon provides a competitive advantage for planktonic over benthic primary producers in shallow lakes

  • 期刊论文

  • 发表日期：

    2025年8月23日

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  • Heding Huang,
  • Dong Luo,
  • Rui Zhou,
  • Pengfei Liu,
  • Lei Li

摘要

Climate change is projected to increase the influx of allochthonous dissolved organic carbon (DOC) into shallow lakes worldwide, altering the physicochemical environment and primary producer communities. These lake ecosystems are mainly characterized by the alternative dominance of submerged macrophytes, periphyton, or phytoplankton. However, our understanding of the ecological effects of DOC on these organisms and their interactions remains limited. We conducted a microcosm experiment to examine how elevated DOC inputs, which lead to lake browning, can affect the growth and relative dominance of submerged macrophytes (Elodea nuttallii and Myriophyllum aquaticum), periphyton and phytoplankton. Results showed that DOC inputs generally inhibited the growth of both periphyton and macrophytes, although periphyton exhibited greater tolerance to light limitation under moderate DOC concentrations. In contrast, phytoplankton biomass (chlorophyll a) increased with increasing DOC inputs. Our findings indicate that primary producers competing for light and nutrients exhibit varying sensitivities to increasing DOC (macrophytes > periphyton > phytoplankton) and these differential responses can influence their competitive dynamics. Nutrients and phytoplankton biomass increased with increasing DOC inputs, leading to a decoupling of ecosystem processes at higher DOC concentrations. These results provide important insights for active management of DOC to maintain the desired ecological state of shallow lakes.