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New publication: Gil Jorge Barros Henriques et al. PLOS Computational Biology. See abstract...

February 22, 2021

Gil Jorge Barros Henriques, Koichi Ito, Christoph Hauert, Michael Doebeli. 2021. On the importance of evolving phenotype distributions on evolutionary diversification. PLOS Computational Biology

Abstract
Evolutionary branching occurs when a population with a unimodal phenotype distribution diversifies into a multimodally distributed population consisting of two or more strains. Branching results from frequency-dependent selection, which is caused by interactions between individuals. For example, a population performing a social task may diversify into a cooperator strain and a defector strain. Branching can also occur in multi-dimensional phenotype spaces, such as when two tasks are performed simultaneously. In such cases, the strains may diverge in different directions: possible outcomes include division of labor (with each population performing one of the tasks) or the diversification into a strain that performs both tasks and another that performs neither. Here we show that the shape of the population’s phenotypic distribution plays a role in determining the direction of branching. Furthermore, we show that the shape of the distribution is, in turn, contingent on the direction of approach to the evolutionary branching point. This results in a distribution–selection feedback that is not captured in analytical models of evolutionary branching, which assume monomorphic populations. Finally, we show that this feedback can influence long-term evolutionary dynamics and promote the evolution of division of labor.

 

Department of Zoology
4200 - 6270 University Blvd.
Vancouver, BC Canada V6T 1Z4
604 822 2131
E-mail info@zoology.ubc.ca
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