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Contingent predictability in evolution: key traits and diversification.

Alan de Queiroz1

  • 1Department of Environmental, Population, and Organismic Biology and Natural History Museum, University of Colorado, Boulder 80309-0334, USA. dequeiro@stripe.colorado.edu

Systematic Biology
|January 30, 2003
PubMed
Summary
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Evolutionary key traits rarely drive diversification alone. Their effects depend on interactions with other species, traits, and the environment, making evolutionary radiations complex yet predictable in certain contexts.

Area of Science:

  • Evolutionary biology
  • Ecology
  • Paleontology

Background:

  • Key innovations are often proposed as drivers of species diversification.
  • However, few traits consistently correlate with increased diversification across different groups.

Purpose of the Study:

  • To investigate the contingent nature of trait-driven diversification.
  • To explore interactions between key traits and other factors influencing diversification rates.

Main Methods:

  • Analysis of existing examples illustrating trait-environment and trait-trait interactions.
  • Examination of diversification patterns in relation to specific traits and environmental conditions.

Main Results:

  • Diversification effects of traits are contingent on interactions with other taxa, traits, and the environment.

Related Experiment Videos

  • Examples include image-forming eyes, biotic seed dispersal, and C4 photosynthesis.
  • These interactions can dampen or modify the diversification impact of key traits.

    • Conclusions:

    • Diversification is not solely driven by key traits but by complex interactions.
    • Evolutionary radiations can be predictable under specific circumstances.
    • Understanding these contingencies is crucial for a nuanced view of evolutionary predictability and contingency.