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Trait Evolution on Phylogenetic Networks

View ORCID ProfileDwueng-Chwuan Jhwueng, View ORCID ProfileBrian C. O’Meara
doi: https://doi.org/10.1101/023986
Dwueng-Chwuan Jhwueng
1Department of Statistics, Feng-Chia University No. 100, Wenhwa Rd., Seatwen, Taichung, Taiwan 40724, R.O.C.
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Brian C. O’Meara
3Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN, 37996-1610, USA
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Abstract

Species may evolve on a reticulate network due to hybridization or other gene flow rather than on a strictly bifurcating tree, but comparative methods to deal with trait evolution on a network are lacking. We create such a method, which uses a Brownian motion model. Our method seeks to separately or jointly detect a bias in trait value coming from hybridization (β) and a burst of variation at the time of hybridization (vH) associated with the hybridization event, as well as traditional Brownian motion parameters of ancestral state (μ) and rate of evolution (σ2) of Brownian motion, as well as measurement error of the tips (SE). We test the method with extensive simulations. We also apply the model to two empirical examples, cichlid body size and Nicotiana drought tolerance, and find substantial measurement error and a hint that hybrids have greater drought tolerance in the latter case. The new methods are available in CRAN R package BMhyd.

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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. All rights reserved. No reuse allowed without permission.
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Posted August 05, 2015.
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Trait Evolution on Phylogenetic Networks
Dwueng-Chwuan Jhwueng, Brian C. O’Meara
bioRxiv 023986; doi: https://doi.org/10.1101/023986
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Trait Evolution on Phylogenetic Networks
Dwueng-Chwuan Jhwueng, Brian C. O’Meara
bioRxiv 023986; doi: https://doi.org/10.1101/023986

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