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Macrophyte Controls on Urban Stream Microbial Metabolic Activity.

Paul Romeijn1, David M Hannah1, Stefan Krause1,2

  • 1School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, Edgbaston B15 2TT, United Kingdom.

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Summary
This summary is machine-generated.

Macrophyte cutting in urban rivers speeds up water flow but doesn't reduce microbial activity. Increased streambed exchange after cutting may enhance nutrient and pollutant removal.

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Area of Science:

  • Environmental Science
  • Hydrology
  • Ecology

Background:

  • Macrophyte growth in urban rivers reduces flow and increases flood risk.
  • Macrophyte cutting is a common management strategy for urban streams.
  • Impacts of macrophyte removal on stream dynamics and microbial activity are poorly understood.

Purpose of the Study:

  • To investigate the effects of macrophyte cutting on transient storage and microbial metabolism in urban streams.
  • To assess the hydrodynamic and biogeochemical consequences of macrophyte removal.

Main Methods:

  • Used slug tracer injections with conservative (uranine) and reactive (resazurin) tracers.
  • Quantified stream flow dynamics and microbial metabolism before and after macrophyte cutting.

Main Results:

  • Macrophyte cutting reduced mean tracer arrival times, indicating faster flow.
  • Transient storage indices increased post-cutting, suggesting enhanced hyporheic exchange.
  • Whole-stream microbial metabolic activity did not significantly decrease.

Conclusions:

  • Macrophyte cutting in urban streams can increase hyporheic exchange and streambed microbial activity.
  • Enhanced hyporheic exchange may compensate for reduced in-stream storage.
  • Macrophyte removal could improve nutrient and pollutant attenuation capacity in urban streams.