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Temperature Response of Soil Organic Matter Decomposition Rates: Construction and Applications of a Temperature Gradient Block
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Future increase in temperature more than decrease in litter quality can affect microbial litter decomposition in

Verónica Ferreira1, Eric Chauvet

  • 1IMAR-CMA, Department of Life Sciences, University of Coimbra, Coimbra, Portugal. veronica@ci.uc.pt

Oecologia
|April 5, 2011
PubMed
Summary
This summary is machine-generated.

Increased water temperature, not altered litter quality, will accelerate decomposition in woodland streams. This temperature effect on decomposition and fungal activity may deplete food resources for higher aquatic trophic levels.

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Area of Science:

  • Aquatic ecology
  • Environmental science
  • Microbial ecology

Background:

  • Small woodland streams rely on allochthonous organic matter.
  • Rising atmospheric CO(2) concentrations predict increased water temperatures and altered litter quality.
  • These changes may impact stream ecosystems.

Purpose of the Study:

  • To assess the effects of water temperature and altered litter quality on decomposition and fungal activity.
  • To understand the interactive effects of these factors on aquatic hyphomycete communities.

Main Methods:

  • Experimental manipulation of water temperature (5°C vs. 10°C).
  • Use of alder litter produced under ambient CO(2) and elevated CO(2) (predicted for 2050).
  • Measurement of litter decomposition rates, fungal respiration, biomass, and conidial production.

Main Results:

  • Litter decomposition and fungal respiration were faster at 10°C than 5°C.
  • Litter quality did not significantly affect decomposition rates but influenced fungal biomass and conidial production.
  • Temperature was the primary driver of aquatic hyphomycete assemblage structure.

Conclusions:

  • Increased water temperature is predicted to be the dominant factor controlling litter decomposition and fungal activity in future woodland streams.
  • Even slight changes in litter quality due to elevated CO(2) may not mitigate the effects of warming.
  • Faster decomposition could lead to food depletion for higher trophic levels in aquatic ecosystems.