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<p>We investigated phytoplankton community changes in temperate shallow lakes at different stages of ecological restoration using morphology-based functional groups (MBFG). We hypothesized that both the functional composition and biovolume of the phytoplankton community would differ, mainly for the difference at time of restoration. Ordination analyses were conducted to assess relationships between abiotic and biotic variables, and generalized linear models were applied to identify differences in phytoplankton biomass across sites and periods. Redundancy analysis revealed that Thompson Lake, with elevated phosphorus levels, favored MBFG VIII (nitrogen-fixing species) and MBFG V (phytoflagellates). Conversely, Lake Chautauqua, characterized by high turbidity and nitrogen levels, supported MBFG IV and VI (organisms lacking specialized traits and species with siliceous exoskeletons, such as diatoms, respectively). Distinct indicator groups were identified, with MBFG VIII prevalent in Thompson Lake and MBFG VII in Lake Chautauqua. The functional approach proved to be an effective tool for assessing ecological restoration, revealing eutrophic conditions in Thompson Lake’s first year of restoration. During this period, the lakes exhibited distinct phytoplankton communities, with cyanobacteria dominating the newly restored lake. These findings indicate that during the lakes restoration, the phytoplankton may deviate from the patterns expected for shallow temperate lakes, showing different functional groups and a predominance of cyanobacteria.</p>

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Phytoplankton functional groups evidence environmental changes between two floodplain lakes in the early and late stages of restoration

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • Felipe Morais Zanon,
  • Patrícia Iatskiu,
  • Michael Joseph Lemke,
  • Luiz Felipe Machado Velho,
  • Luzia Cleide Rodrigues

摘要

We investigated phytoplankton community changes in temperate shallow lakes at different stages of ecological restoration using morphology-based functional groups (MBFG). We hypothesized that both the functional composition and biovolume of the phytoplankton community would differ, mainly for the difference at time of restoration. Ordination analyses were conducted to assess relationships between abiotic and biotic variables, and generalized linear models were applied to identify differences in phytoplankton biomass across sites and periods. Redundancy analysis revealed that Thompson Lake, with elevated phosphorus levels, favored MBFG VIII (nitrogen-fixing species) and MBFG V (phytoflagellates). Conversely, Lake Chautauqua, characterized by high turbidity and nitrogen levels, supported MBFG IV and VI (organisms lacking specialized traits and species with siliceous exoskeletons, such as diatoms, respectively). Distinct indicator groups were identified, with MBFG VIII prevalent in Thompson Lake and MBFG VII in Lake Chautauqua. The functional approach proved to be an effective tool for assessing ecological restoration, revealing eutrophic conditions in Thompson Lake’s first year of restoration. During this period, the lakes exhibited distinct phytoplankton communities, with cyanobacteria dominating the newly restored lake. These findings indicate that during the lakes restoration, the phytoplankton may deviate from the patterns expected for shallow temperate lakes, showing different functional groups and a predominance of cyanobacteria.