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Biodiversity and ecosystem functioning: a mechanistic model

M Loreau1

  • 1Laboratoire d'Ecologie, Unité Mixte de Recherche 7625, Ecole Normale Supérieure, 46 rue d'Ulm, F-75230 Paris Cedex 05, France. Loreau@ens.fr

Proceedings of the National Academy of Sciences of the United States of America
|May 20, 1998
PubMed
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Biodiversity loss can harm ecosystems, but new models show species richness doesn't always boost function. Complementarity and resource use intensity can enhance ecosystem processes like productivity.

Area of Science:

  • Ecology
  • Ecosystem Science
  • Theoretical Ecology

Background:

  • Growing evidence suggests biodiversity loss negatively impacts ecosystem functioning and sustainability.
  • Current theories and models are insufficient for robust predictions and interpretations of these impacts.

Purpose of the Study:

  • To present a mechanistic model of a spatially structured ecosystem to explore the relationship between plant species richness and ecosystem functioning.
  • To identify factors that may drive positive correlations between biodiversity and ecosystem processes.

Main Methods:

  • Developed a mechanistic model of a spatially structured ecosystem.
  • Simulated plant competition for a limiting soil nutrient.
  • Analyzed the influence of species complementarity and resource-use intensity on ecosystem processes.

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Main Results:

  • Plant species richness does not invariably enhance ecosystem processes.
  • Two key factors identified: below-ground complementarity and a positive correlation between resource-use intensity and diversity.
  • Model predicts increased plant biomass, primary productivity, and nutrient retention with higher diversity under specific conditions.

Conclusions:

  • Complementarity and resource-use intensity can explain observed increases in ecosystem functioning with biodiversity.
  • The impact of species richness on ecosystem processes can be masked by environmental factors, necessitating controlled experimental conditions.
  • Future research should focus on identifying and separating the mechanisms driving ecosystem responses to biodiversity.