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Area of Science:

  • Evolutionary Biology
  • Phylogenetics
  • Ecology

Background:

  • Many phylogenetic comparative methods rely on the Brownian motion model for trait evolution.
  • The suitability of the Brownian motion model is infrequently tested, despite factors like adaptive radiations potentially violating its assumptions.

Purpose of the Study:

  • To test the assumption of Brownian motion in trait evolution within adaptive radiations.
  • To evaluate the performance of two statistical tests designed to detect deviations from Brownian motion.

Main Methods:

  • Applied two statistical tests for Brownian motion assumption.
  • Utilized a case study of feeding adaptations in two warbler radiations.

Main Results:

  • The tests demonstrated high power to reject non-Brownian niche-filling models.
  • In one warbler radiation, trait evolution patterns deviated significantly from Brownian motion.
  • Observed patterns in one radiation were consistent with niche-filling models.

Conclusions:

  • The Brownian motion model may be inappropriate for studying trait evolution in adaptive radiations.
  • Niche availability and filling can drive evolutionary patterns that differ from Brownian motion.
  • The developed tests are effective in identifying deviations from Brownian motion in empirical data.