Hybridization and diversification are positively correlated across vascular plant families
2019
Hybridizationhas experimental and observational ties to evolutionary processes and outcomes such as adaptation, speciation, and radiation. Although it has been hypothesized that
hybridizationand diversification are correlated, this idea remains largely untested empirically. Here, we use a
hybridizationdatabase on 195 plant families, life history information, and a time-calibrated family-level phylogeny to test for phylogenetically-corrected associations between
hybridizationand
diversification rates, while also taking into account life-history traits that may be correlated with both processes. We show that diversification and
hybridizationare positively correlated using three different methods to estimate
diversification ratesand two different metrics of
hybridization. Moreover, the relationship remains detectable when incorporating the correlations between diversification and two other life history characteristics, perenniality and woodiness. We further provide potential mechanisms for this association under three different scenarios:
hybridizationmay drive diversification, diversification may drive
hybridization, or both
hybridizationand diversification may jointly be driven by other factors. We suggest future studies to disentangle the
causal structure.
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