Data from: Repeated evolution and reversibility of self-fertilization in the volvocine green algae
Hanschen, Erik R., University of Arizona
Herron, Matthew D., Georgia Institute of Technology
Wiens, John J., University of Arizona
Nozaki, Hisayoshi, University of Tokyo
Michod, Richard E., University of Arizona
Published Nov 03, 2017 on Dryad.
Cite this dataset
Hanschen, Erik R. et al. (2017). Data from: Repeated evolution and reversibility of self-fertilization in the volvocine green algae [Dataset]. Dryad. https://doi.org/10.5061/dryad.fg12f
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.
600 Bayesian trees
Systematic sample of Bayesian trees. Every 1,000th post-burnin tree from the four runs was included, for a total of 600 trees.
Volvocine tree, ultrametric
Volvocine phylogenetic tree, created from the phylogram using a penalized likelihood function.
Volvocine tree, phylogram
Bayesian phylogram of volvocine and outgroup taxa.
Chloroplast data matrix
Data matrix for volvocine chloroplast phylogenetic tree.
Continuous colony size metrics and discrete character states for mating systems and associated references for volvocine taxa. For heterothallic species, only one strain of a mating pair has been given.
National Science Foundation, Award: MCB-1412395, DEB-1457701