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Abstract Detail


Stone, Benjamin [1], Wolfe, Andi [1].

The effect of glaciation on hybridization and speciation in Penstemon subg. Dasanthera (Plantaginaceae).

Glaciation during the Quaternary Period often forced species in temperate climates to contract their ranges and reside in small pockets of suitable habitat (refugia). Using high-throughput sequence data, we employ a combination of species distribution models and hybridization tests to assess the effect of glaciation on the geographic distributions, phylogenetic relationships, and patterns of gene flow of five species of Penstemon subgenus Dasanthera, long-lived shrubby angiosperms distributed throughout the Pacific Northwest of North America. Surprisingly, we find that rather than reducing their ranges to small refugia, most of the species included in this study experienced increased suitable habitat during the Last Glacial Maximum, relative to the present day. We also find substantial evidence for gene exchange between species, with the bulk of introgression events occurring in or near the Klamath Mountains of southwestern Oregon and northwestern California. Subsequently, our phylogenetic inference reveals blurred taxonomic boundaries in the Klamath Mountains, where introgression is most prevalent. Our results question the classical paradigm of temperate species’ responses to glaciation and highlight the importance of contextualizing phylogenetic inference with species’ histories of introgression.

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1 - The Ohio State University, Evolution, Ecology & Organismal Biology, 300 Aronoff Laboratory, 318 W. 12th Avenue, Columbus, OH, 43210, United States

Pacific Northwest.

Presentation Type: Oral Paper
Session: COOLII, ASPT Cooley Award Talks II
Location: Virtual/Virtual
Date: Wednesday, July 21st, 2021
Time: 12:45 PM(EDT)
Number: COOLII002
Abstract ID:710
Candidate for Awards:George R. Cooley Award

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