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Related Experiment Video

Updated: Jun 12, 2026

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
10:20

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Published on: March 12, 2013

Multiple drivers of leaf litter decomposition under salinity stress.

Diana Rojo1, Raymond P Kidder2, J Checo Colón-Gaud2

  • 1Department of Plant Biology and Ecology, Faculty of Science and Technology, University of the Basque Country (EHU), Barrio Sarriena s/n, 48940, Leioa, Spain.

Environmental Pollution (Barking, Essex : 1987)
|June 10, 2026
PubMed
Summary

Global change impacts stream ecosystems by altering leaf litter decomposition. Salinity and leaf litter type interact, affecting detritivore and microbial decomposition rates and aquatic hyphomycete activity.

Keywords:
Aquatic hyphomycetesDetrital processingDetritivorous invertebratesMicrocosm experimentPlant diversitySalinization

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Area of Science:

  • Ecology
  • Environmental Science
  • Aquatic Biology

Background:

  • Global change causes salinity shifts, impacting freshwater ecosystems.
  • Leaf litter decomposition is crucial for detritus-based stream functioning.
  • Decomposition rates depend on leaf litter identity, diversity, and environmental factors.

Purpose of the Study:

  • To investigate the interactive effects of salinity and leaf litter characteristics on decomposition.
  • To assess impacts on detritivore-mediated decomposition, microbial decomposition, and aquatic hyphomycete communities.
  • To understand how these factors influence stream ecosystem functioning.

Main Methods:

  • Controlled microcosm experiment with three salinity levels (0, 5, 10 PSU).
  • Leaf litter treatments included monocultures of Acer rubrum and Spartina alterniflora, and a mixture.
  • Evaluated decomposition rates (detritivore and microbial), aquatic hyphomycete sporulation, and assemblage composition.

Main Results:

  • Significant interaction between salinity and leaf litter type on detritivore-driven decomposition.
  • Higher decomposition of S. alterniflora at low salinity and A. rubrum at intermediate salinity.
  • Aquatic hyphomycete sporulation increased on S. alterniflora and decreased on A. rubrum; low salinity enhanced activity, but higher salinity suppressed it.

Conclusions:

  • Simultaneous changes in salinity and riparian vegetation composition significantly shape stream ecosystem functioning.
  • Salinity and leaf litter type interact to influence decomposition pathways.
  • Understanding these interactions is vital for predicting ecosystem responses to global change.