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The tempo of evolutionary decline in self-compatible plant lineages

View ORCID ProfileWilliam A. Freyman, View ORCID ProfileSebastian Höhna
doi: https://doi.org/10.1101/210484
William A. Freyman
1Department of Integrative Biology, University of California, Berkeley, CA, 91720, USA;
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Sebastian Höhna
2Division of Evolutionary Biology, Ludwig-Maximilians-Universitat München, Germany
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Abstract

A major goal of evolutionary biology is to identify key evolutionary transitions that correspond with shifts in speciation and extinction rates. Here we test the association of transitions in plant mating system with shifts in diversification rates using a novel stochastic character mapping method that identifies the timing and nature of both transitions in trait evolution and diversification rate shifts over evolutionary trees. Utilizing a state-dependent speciation and extinction (SSE) model and a densely sampled fossil-calibrated phylogeny of the plant family Onagraceae, we confirm long standing theory that self-compatible lineages have higher extinction rates and lower net diversification rates compared to self-incompatible lineages. Furthermore, our results provide the first empirical evidence for the “senescing” diversification rates predicted in highly selfing lineages: our mapped character histories show that the loss of self-incompatibility is followed by a short-term spike in speciation rates, which declines after a time lag of several million years resulting in negative net diversification. Lineages that have long been self-compatible such as Fuchsia and Clarkia are in a previously unrecognized and ongoing evolutionary decline.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted January 05, 2018.
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The tempo of evolutionary decline in self-compatible plant lineages
William A. Freyman, Sebastian Höhna
bioRxiv 210484; doi: https://doi.org/10.1101/210484
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The tempo of evolutionary decline in self-compatible plant lineages
William A. Freyman, Sebastian Höhna
bioRxiv 210484; doi: https://doi.org/10.1101/210484

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