Natural hybridization between genera that diverged from each other approximately 60 million years ago.
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A fern from the French Pyrenees-×Cystocarpium roskamianum-is a recently formed intergeneric hybrid between parental lineages that diverged from each other approximately 60 million years ago (mya; 95% highest posterior density: 40.2-76.2 mya). This is an extraordinarily deep hybridization event, roughly akin to an elephant hybridizing with a manatee or a human with a lemur. In the context of other reported deep hybrids, this finding suggests that populations of ferns, and other plants with abiotically mediated fertilization, may evolve reproductive incompatibilities more slowly, perhaps because they lack many of the premating isolation mechanisms that characterize most other groups of organisms. This conclusion implies that major features of Earth's biodiversity-such as the relatively small number of species of ferns compared to those of angiosperms-may be, in part, an indirect by-product of this slower "speciation clock" rather than a direct consequence of adaptive innovations by the more diverse lineages.
Molecular Sequence Data
Sequence Analysis, Protein
Published Version (Please cite this version)10.1086/679662
Publication InfoFraser-Jenkins, CR; Hovenkamp, PH; Johnson, AK; Pryer, Kathleen M; Roskam, HC; Rothfels, CJ; ... Windham, MD (2015). Natural hybridization between genera that diverged from each other approximately 60 million years ago. Am Nat, 185(3). pp. 433-442. 10.1086/679662. Retrieved from https://hdl.handle.net/10161/10248.
This is constructed from limited available data and may be imprecise. To cite this article, please review & use the official citation provided by the journal.
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Professor of Biology
My research focuses on understanding the evolutionary relationships of ancient land plants, especially ferns and horsetails, by integrating evidence from morphology, molecules (DNA sequence data from multiple genes), and the fossil record. I use an explicit phylogenetic framework to examine the morphological evolution of various sporophytic and gametophytic characters within vascular plants, and to gain insight into the evolution of various life history traits and the body plans that typ