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Nutrient addition accelerates leaf breakdown in an alpine springbrook.

C T Robinson1, M O Gessner1

  • 1Department of Limnology, EAWAG/ETH, Überlandstrasse 133, CH-8600 Dübendorf, Switzerland, , , , , , CH.

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Summary
This summary is machine-generated.

Nutrient enrichment significantly accelerated organic matter breakdown in alpine streams. Increased leaf decomposition was linked to greater shredder insect feeding, highlighting nutrient impacts on stream ecosystems.

Keywords:
Aquatic hyphomycetesKey words Alpine springbrookLeaf breakdownMacroinvertebratesNutrient addition

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Area of Science:

  • Ecology
  • Environmental Science
  • Aquatic Biology

Background:

  • Organic matter breakdown is crucial for stream ecosystem functioning.
  • Nutrient availability can influence decomposition rates and food web dynamics.
  • Alpine spring ecosystems are sensitive to environmental changes.

Purpose of the Study:

  • To investigate the impact of nutrient enrichment (phosphorus and nitrogen) on leaf litter decomposition in an alpine springbrook.
  • To determine the role of macroinvertebrates and microbial communities in nutrient-mediated decomposition.

Main Methods:

  • Alder leaf packs were used as a substrate for decomposition.
  • Slow-release fertilizer briquettes were added to enrich leaf packs with phosphorus and nitrogen.
  • Decomposition rates were quantified by mass loss, and fungal biomass and macroinvertebrate communities were assessed.

Main Results:

  • Nutrient-enriched leaf packs decomposed significantly faster (k=0.0284 day⁻¹) than unfertilized ones (k=0.0137 day⁻¹), showing 30% greater mass loss.
  • Fungal biomass and aquatic hyphomycete sporulation were similar between treatments, suggesting microbial activity was not the primary driver of accelerated decomposition.
  • Fertilized packs supported significantly higher numbers and biomass of macroinvertebrates, particularly shredding stoneflies.

Conclusions:

  • Nutrient enrichment enhances organic matter breakdown in alpine springbrooks.
  • Increased shredder macroinvertebrate feeding, stimulated by nutrient addition, is the main driver of accelerated leaf decomposition.
  • These findings underscore the sensitivity of alpine stream ecosystems to nutrient inputs.