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    Repeated evolution and reversibility of self-fertilization in the volvocine green algae*

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    AncStates_2_Homothallism_v12.pdf
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    Final Accepted Manuscript
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    Author
    Hanschen, Erik R.
    Herron, Matthew D.
    Wiens, John J.
    Nozaki, Hisayoshi cc
    Michod, Richard E.
    Affiliation
    Univ Arizona, Dept Ecol & Evolutionary Biol
    Issue Date
    2018-02
    Keywords
    Haploid
    phylogenetics
    self-fertilization
    sexual reproduction
    sex
    volvocine green algae
    
    Metadata
    Show full item record
    Publisher
    WILEY
    Citation
    Hanschen, E. R., Herron, M. D., Wiens, J. J., Nozaki, H. and Michod, R. E. (2018), Repeated evolution and reversibility of self‐fertilization in the volvocine green algae. Evolution, 72: 386-398. doi:10.1111/evo.13394
    Journal
    EVOLUTION
    Rights
    © 2017 The Author(s). Evolution © 2017 The Society for the Study of Evolution.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Outcrossing and self-fertilization are fundamental strategies of sexual reproduction, each with different evolutionary costs and benefits. Self-fertilization is thought to be an evolutionary dead-end strategy, beneficial in the short term but costly in the long term, resulting in self-fertilizing species that occupy only the tips of phylogenetic trees. Here, we use volvocine green algae to investigate the evolution of self-fertilization. We use ancestral-state reconstructions to show that self-fertilization has repeatedly evolved from outcrossing ancestors and that multiple reversals from selfing to outcrossing have occurred. We use three phylogenetic metrics to show that self-fertilization is not restricted to the tips of the phylogenetic tree, a finding inconsistent with the view of self-fertilization as a dead-end strategy. We also find no evidence for higher extinction rates or lower speciation rates in selfing lineages. We find that self-fertilizing species have significantly larger colonies than outcrossing species, suggesting the benefits of selfing may counteract the costs of increased size. We speculate that our macroevolutionary results on self-fertilization (i.e., non-tippy distribution, no decreased diversification rates) may be explained by the haploid-dominant life cycle that occurs in volvocine algae, which may alter the costs and benefits of selfing.
    Note
    12 month embargo; published online: 14 November 2017
    ISSN
    00143820
    PubMed ID
    29134623
    DOI
    10.1111/evo.13394
    Version
    Final accepted manuscript
    Sponsors
    National Aeronautics and Space Administration [NNX13AH41G, NNX15AR33G]; National Institute of Health [GM084905]; National Science Foundation [MCB-1412395, DEB-1457701]; MEXT/JSPS KAKENHI [15K14590, 16H02518]
    Additional Links
    http://doi.wiley.com/10.1111/evo.13394
    ae974a485f413a2113503eed53cd6c53
    10.1111/evo.13394
    Scopus Count
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    UA Faculty Publications

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