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How does resource supply affect evolutionary diversification?

Alex R Hall1, Nick Colegrave

  • 1Institute of Evolutionary Biology, School of Biological Sciences, University of Edinburgh, Ashworth Laboratories, West Mains road, Edinburgh EH9 3JT, UK. alex.hall@ed.ac.uk

Proceedings. Biological Sciences
|October 4, 2006
PubMed
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Evolutionary diversification, or the development of new species, peaks at intermediate resource levels. This occurs due to competition and ecological opportunity, impacting biodiversity patterns.

Area of Science:

  • Evolutionary Biology
  • Ecology
  • Microbiology

Background:

  • Resource availability is a key factor influencing evolutionary diversification.
  • Previous explanations focused on selection in heterogeneous environments.

Purpose of the Study:

  • To propose and test an alternative mechanism for resource-driven diversification based on resource exploitation.
  • To investigate the relationship between resource supply and niche diversification.

Main Methods:

  • A selection experiment was conducted using the bacterium Pseudomonas fluorescens.
  • Experiments were performed in spatially homogeneous environments across a range of resource supply rates.

Main Results:

  • Niche diversification exhibited a unimodal relationship with resource availability, peaking at intermediate levels.

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  • This pattern suggests a balance between resource competition and ecological opportunity.

    • Conclusions:

    • Competition for resources and ecological opportunity drive evolutionary diversification.
    • This mechanism may explain biodiversity patterns like latitudinal gradients and responses to environmental enrichment.