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Area of Science:

  • Ecology
  • Microbiology
  • Environmental Science

Background:

  • Community assembly processes influence ecosystem functions like carbon and nutrient cycling.
  • Understanding the link between microbial community assembly and ecosystem functioning is crucial but often lacking.

Purpose of the Study:

  • To investigate the relationships between microbial community assembly and metabolism in hyporheic zones.
  • To understand how different habitat types and temporal scales affect these relationships.

Main Methods:

  • Paired sampling of attached and planktonic microbial communities across seasonal and sub-hourly hydrologic fluctuations.
  • Utilized null modeling and temporally explicit multivariate statistics.
  • Analyzed the influence of sediment and porewater physicochemistry as selective pressures.

Main Results:

  • Multiple selective pressures integrate to drive microbial community composition changes at distinct timescales across habitat types.
  • Observed contrasting associations of *Betaproteobacteria* and *Thaumarchaeota* with ecological selection and seasonal metabolism shifts.
  • Developed a conceptual model where oscillating pressures opposing stable pressures increase microbial metabolism.

Conclusions:

  • Microbial community assembly is intricately linked to ecosystem metabolism in hyporheic environments.
  • A conceptual model explains how interacting selective pressures modulate microbial metabolism.
  • Findings are relevant for predicting ecosystem functioning in systems with multiple selective pressures.