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Species selection and random drift in macroevolution.

Luis-Miguel Chevin1

  • 1CEFE UMR 5175, CNRS, Université de Montpellier, Université Paul-Valéry Montpellier, EPHE, 1919 route de Mende, F-34293 Montpellier, CEDEX 5, France. luis-miguel.chevin@cefe.cnrs.fr.

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Summary
This summary is machine-generated.

Macroevolutionary dynamics are shaped by trait-dependent speciation and extinction. This study reveals how net diversification and turnover rates influence species selection and macroevolutionary randomness.

Keywords:
Anagenetic changecladogenetic changelineage sortingtrait-dependent diversification

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Area of Science:

  • Evolutionary biology
  • Macroevolutionary theory
  • Phylogenetics

Background:

  • Species selection is a key driver of phenotypic macroevolution.
  • Statistical methods for quantifying species selection lack dynamical theory.
  • Understanding deterministic vs. stochastic forces in macroevolution is crucial.

Purpose of the Study:

  • To develop dynamical theory for interpreting species selection.
  • To investigate the influence of phenotype-dependent speciation/extinction on macroevolutionary change.
  • To compare evolutionary forces across micro- and macroevolutionary levels.

Main Methods:

  • Utilized diffusion approximations of birth-death processes.
  • Analyzed phenotype-dependent speciation and extinction rates.
  • Modeled species selection coefficients and selection differentials.

Main Results:

  • Species selection depends on net diversification and turnover rates, especially in small clades.
  • Phenotype-dependent rates influence both expected and random macroevolutionary change.
  • Species-level random drift is stronger with higher turnover rates.

Conclusions:

  • Provides a theoretical framework for understanding species selection and macroevolutionary forces.
  • Highlights the importance of species turnover rates and clade size.
  • Identifies the need for data on new optimum phenotype origination rates for empirical application.