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Agriculture impairs stream ecosystem functioning in a tropical catchment.

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Summary

Agricultural expansion in tropical regions harms stream ecosystems. Increased agriculture boosts microbial decomposition but reduces detritivore activity, negatively impacting overall stream functioning and biodiversity.

Keywords:
Detritivore assemblagesEcosystem functional integrityLand useLeaf litter breakdownNutrient concentrationsPesticide toxicity

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Area of Science:

  • Ecology
  • Environmental Science
  • Tropical Biology

Background:

  • Agricultural expansion in tropical regions leads to deforestation, impacting biodiversity and ecosystem services.
  • Tropical streams are vital ecosystems, yet their functioning under agricultural pressure is poorly understood.
  • Assessing the ecological integrity of tropical streams requires knowledge of how agriculture affects ecosystem processes.

Purpose of the Study:

  • To investigate the effects of varying agricultural influence on tropical stream ecosystem functioning.
  • To differentiate the impacts of agriculture on microbial and detritivore-mediated decomposition pathways.
  • To evaluate how litter quality influences decomposition rates under different agricultural settings.

Main Methods:

  • Conducted a litter decomposition experiment in streams with low (protected area), medium (buffer area), and high (agricultural area) agricultural influence.
  • Used coarse- and fine-mesh litterbags to separate microbial from detritivore contributions to decomposition.
  • Assessed decomposition rates using litter from three riparian species (Alnus acuminata, Ficus insipida, Quercus bumelioides) with differing quality.
  • Analyzed detritivore assemblages via litterbag contents and benthic sampling.

Main Results:

  • Increasing agricultural influence promoted microbial decomposition, likely due to nutrient enrichment.
  • Detritivore-mediated and total decomposition rates were inhibited in streams with higher agricultural impact, linked to reduced detritivore abundance.
  • Pesticides and sedimentation associated with agriculture were suggested as causes for detritivore decline.
  • Decomposition effects varied by litter species, with Alnus and Ficus showing significant impacts, while Quercus decomposition remained low across the gradient.

Conclusions:

  • Agriculture significantly alters tropical stream ecosystem functioning by modifying decomposition pathways.
  • Reduced detritivore activity due to agricultural pollutants and sedimentation impairs ecosystem processes.
  • These changes in stream function have potential global implications for biogeochemical cycles.
  • Understanding these impacts is crucial for managing tropical watersheds and conserving stream biodiversity.