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Bridging Inter- and Intraspecific Trait Evolution with a Hierarchical Bayesian Approach.

Anna Kostikova¹, Daniele Silvestro², Peter B Pearman³

¹Department of Ecology and Evolution, University of Lausanne, 1015 Lausanne, Switzerland; Swiss Institute of Bioinformatics, Quartier Sorge, 1015 Lausanne, Swizterland;

Systematic Biology

|February 26, 2016

Summary

Organism evolution relies on intraspecific variation. New models now estimate trait evolution rates by considering both trait mean and variance, advancing macroevolutionary studies.

Keywords:

Comparative phylogenetics Markov Chain Monte Carlo hierarchical Bayesian model intraspecific variance macroevolution niche breadth

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Area of Science:

Evolutionary Biology
Quantitative Genetics

Background:

Intraspecific variation is key to organismal evolution, influencing competition, resource partitioning, and speciation.
Existing comparative models for trait evolution often fail to explicitly test hypotheses about intraspecific variation or simultaneously estimate rates considering both trait mean and variance.

Purpose of the Study:

To develop a novel hierarchical Bayesian model for phenotypic trait evolution that simultaneously incorporates interspecific and intraspecific variation.
To enable explicit testing of hypotheses regarding the evolution of intraspecific variation and estimate trait evolution rates accounting for both mean and variance.

Main Methods:

A hierarchical Bayesian approach was used to model phenotypic trait evolution.
Species-specific trait means were modeled using a Brownian motion process.
Species-specific trait variances were modeled using Brownian or Ornstein-Uhlenbeck processes.

Main Results:

The new model was evaluated for its power through simulations.
The study investigated the impact of life-history traits on the evolution of intraspecific variation in Eriogonoideae (Polygonaceae).

Conclusions:

The developed model offers a significant advancement for comparative studies of macroevolution.
The model is extendable to more complex scenarios of inter- and intraspecific variation evolution.
This work provides a step towards more comprehensive comparative models in macroevolutionary research.