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Community patterns in source-sink metacommunities.

Nicolas Mouquet1, Michel Loreau

  • 1Department of Biological Science and School of Computational Science and Information Technology, Florida State University, Tallahassee, Florida 32306, USA. mouquet@isem.univ-montp2.fr

The American Naturalist
|November 18, 2003
PubMed
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Dispersal in competitive metacommunities shapes local and regional diversity. Intermediate dispersal maximizes local diversity, while high dispersal leads to homogenization and reduced regional diversity.

Area of Science:

  • Ecology
  • Metacommunity Dynamics
  • Biodiversity Science

Background:

  • Metacommunity models describe regional species pools and local community interactions.
  • Dispersal is a key factor influencing local and regional biodiversity patterns.
  • Previous studies defined coexistence but lacked predictions for community-wide patterns.

Purpose of the Study:

  • To model a source-sink competitive metacommunity and predict community-wide patterns.
  • To investigate the effects of varying dispersal proportions on ecological properties.
  • To offer a niche-based alternative to neutral metacommunity models.

Main Methods:

  • Development of a source-sink competitive metacommunity model.
  • Analysis of species richness, relative abundances, and functional properties (productivity, space occupation).

Related Experiment Videos

  • Assessment of local (alpha), between-community (beta), and regional (gamma) diversity metrics.

    • Main Results:

    • Local diversity peaks at intermediate dispersal; regional diversity declines with increased dispersal due to homogenization.
    • Species richness and rank abundance distributions are significantly influenced by dispersal levels.
    • Local productivity and space occupation decrease with higher dispersal, creating varied richness-productivity relationships.

    Conclusions:

    • Dispersal strongly mediates community structure and function in metacommunities.
    • Niche-based processes, driven by dispersal, offer an alternative explanation for metacommunity patterns.
    • Findings have implications for conservation biology and landscape management strategies.