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Inferring the Evolutionary Reduction of Corm Lobation in Isoëtes using Bayesian Model-Averaged Ancestral State Reconstruction

View ORCID ProfileForrest D. Freund, View ORCID ProfileWilliam A. Freyman, View ORCID ProfileCarl J. Rothfels
doi: https://doi.org/10.1101/212316
Forrest D. Freund
Department of Integrative Biology, University of California, Berkeley, 3040 Valley Life, Sciences Building #3140, Berkeley, CA 94720-3140
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  • For correspondence: lentic64@berkeley.edu
William A. Freyman
Department of Integrative Biology, University of California, Berkeley, 3040 Valley Life, Sciences Building #3140, Berkeley, CA 94720-3140
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  • For correspondence: freyman@berkeley.edu
Carl J. Rothfels
Department of Integrative Biology, University of California, Berkeley, 3040 Valley Life, Sciences Building #3140, Berkeley, CA 94720-3140
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ABSTRACT

Inferring the evolution of characters in Isoëtes has been problematic, as these plants are morphologically conservative and yet highly variable and homoplasious within that conserved base morphology. However, molecular phylogenies have given us a valuable tool to test hypothesis of character evolution within the genus. One such hypothesis is that extant Isoëtes have undergone a morphological reduction from larger arborescent lycophyte ancestors. In this work we examine the reduction in lobe numbers on the underground trunk, or corm, over evolutionary time. Using reversible-jump MCMC and Bayesian inference, our results support the hypothesis of a directional reduction in lobe number in Isoëtes, with the best-supported model of character evolution being one of irreversible reduction. Furthermore, the most probable ancestral corm lobe number of extant Isoëtes is three, and a reduction to two lobes has occurred at least six times. From our results, we can infer that corm lobation, like many other traits in Isoëtes, shows a degree of homoplasy, yet also shows ongoing evolutionary reduction.

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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 November 01, 2017.
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Inferring the Evolutionary Reduction of Corm Lobation in Isoëtes using Bayesian Model-Averaged Ancestral State Reconstruction
Forrest D. Freund, William A. Freyman, Carl J. Rothfels
bioRxiv 212316; doi: https://doi.org/10.1101/212316
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Inferring the Evolutionary Reduction of Corm Lobation in Isoëtes using Bayesian Model-Averaged Ancestral State Reconstruction
Forrest D. Freund, William A. Freyman, Carl J. Rothfels
bioRxiv 212316; doi: https://doi.org/10.1101/212316

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