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A fly in a tube: Macroevolutionary expectations for integrated phenotypes.

Ryan N Felice1,2, Marcela Randau1,2, Anjali Goswami1,2

  • 1Department of Life Sciences, The Natural History Museum, London SW7 5DB, United Kingdom.

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Phenotypic integration and modularity influence how biological traits evolve. While integration shapes potential variation, it doesn't necessarily control evolutionary rates, impacting evolutionary disparity.

Keywords:
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Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Quantitative genetics

Background:

  • Phenotypic integration and modularity describe trait relationships in organisms.
  • These relationships are shaped by genetic, developmental, and functional interactions.
  • Understanding their evolutionary impact requires a phylogenetic framework.

Purpose of the Study:

  • To review macroevolutionary studies on trait integration and modularity.
  • To synthesize empirical and theoretical work into a conceptual framework.
  • To predict the effects of integration on evolutionary rate and disparity.

Main Methods:

  • Literature review of macroevolutionary studies.
  • Synthesis of empirical and theoretical research.
  • Development of a conceptual framework ('fly in a tube').

Main Results:

  • Integration magnitude influences phenotypic variation potential (tube shape/size).
  • Evolutionary rate (fly's speed) is not necessarily controlled by trait interactions.
  • Empirical example (avian cranium) shows reduced disparity relative to Brownian motion.

Conclusions:

  • Trait integration constrains evolutionary paths but doesn't dictate speed.
  • Integration affects evolutionary disparity more than evolutionary rate.
  • Phylogenetic context is crucial for understanding integration's macroevolutionary effects.