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Freshwater microbial communities shift dramatically with seasonal ice cover, showing increased diversity and blooms of nitrogen-cycling microbes during winter ice. This research details these crucial changes in aquatic microbial ecosystems.

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Area of Science:

  • Microbial ecology
  • Limnology
  • Environmental science

Background:

  • Freshwater ecosystems face significant seasonal changes, including prolonged ice cover.
  • Understanding microbial dynamics during lake ice formation and persistence is crucial but limited.
  • Aquatic microbial communities are sensitive indicators of environmental shifts.

Purpose of the Study:

  • To characterize the temporal changes in microbial abundance and community composition during lake ice formation and persistent ice cover.
  • To investigate the impact of seasonal ice cover on freshwater microbial ecosystems.
  • To identify shifts in microbial taxa and their functions throughout the winter period.

Main Methods:

  • Weekly sampling of surface water from the Keweenaw Waterway over five months (November-April).
  • Analysis of environmental conditions, microbial abundance, and microbial community composition.
  • Utilized high-throughput sequencing to determine microbial community structure.

Main Results:

  • Distinct microbial community compositions were observed between ice-free and ice-covered periods.
  • Significant shifts in microbial abundance and diversity occurred during transitions into and out of ice cover.
  • Microbial richness increased under ice cover, with a notable bloom of nitrogen-cycling microbes, including nitrifying taxa.

Conclusions:

  • Lake ice cover significantly alters freshwater microbial community structure, abundance, and diversity.
  • Seasonal transitions into and out of ice cover drive dramatic microbial shifts.
  • Ice cover favors specific microbial groups, including those involved in nitrogen cycling, impacting ecosystem functions.