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Macroinvertebrate Response to Internal Nutrient Loading Increases in Shallow Eutrophic Lakes.

Kai Peng1, Rui Dong1,2, Boqiang Qin1,3

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Internal nutrient loading in eutrophic lakes hinders recovery. Macroinvertebrate sensitivity, particularly oligochaetes and Shannon-Wiener index, decreased, potentially impacting lake eutrophication assessment.

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Area of Science:

  • Environmental Science
  • Ecology
  • Limnology

Background:

  • Eutrophic lakes face delayed recovery due to internal nutrient loading, even with controlled external inputs.
  • Macroinvertebrates are sensitive to hypoxia from eutrophication, but their response to changing conditions remains unclear.
  • Lake Taihu's northern region experienced intensified eutrophication post-2013, despite stable external loading.

Purpose of the Study:

  • To investigate the impact of internal nutrient loading and associated hypoxia on macroinvertebrate communities in Lake Taihu.
  • To evaluate the effectiveness of macroinvertebrates, specifically oligochaetes and the Shannon-Wiener index, in assessing eutrophication under internal loading conditions.

Main Methods:

  • Analysis of long-term monitoring data (2007-2019) from northern Lake Taihu.
  • Examination of macroinvertebrate community structure and population density.
  • Correlation analysis between eutrophication stages, sediment nutrient levels, hypoxia, and macroinvertebrate responses.

Main Results:

  • Macroinvertebrate community structure and density varied across different eutrophication stages.
  • Oligochaete density and the Shannon-Wiener index showed reduced sensitivity to eutrophication.
  • Sediment hypoxia was frequent during algal blooms but reduced by wind disturbance when blooms were absent.

Conclusions:

  • Internal nutrient loading dynamics and algal blooms significantly influence sediment hypoxia and macroinvertebrate communities.
  • Traditional assessment methods using oligochaetes and the Shannon-Wiener index may be less reliable for evaluating eutrophication dominated by internal loading.
  • Further research is needed to refine eutrophication assessment strategies in lakes with significant internal nutrient cycling.