Abstract Detail

Phylogenomic Perspectives on Reproductive Isolation and Introgression

Folk, Ryan [1], Gaynor, Michelle [2], Okuyama, Yudai [3], Soltis, Pamela [4], Soltis, Douglas [5], Guralnick, Robert [6].

New prospects in studying hybridization: Assessing historical climatic drivers.

It is now well understood that natural hybridization is common in numerous taxa across the Tree of Life and that hybrid organisms can often persist in the landscape independent from their progenitors. New methodological developments are moving the field toward more direct assessments of the long-term impact of hybridization on genome structure and species diversification. Still to be developed in the field is a historical macroevolutionary perspective that would directly estimate the long-term importance of hybridization to evolution. Here we will begin by outlining major macroevolutionary questions that, while not new, are now testable across a broad range of taxa with high-throughput sequence data and recent statistical approaches. Broadly, these questions include: (1) whether there is bias of introgression across the genome, (2) what is the relative frequency of formation and subsequent fates of introgressants and hybrid species, and (3) whether historical climate change has enabled hybridization via geographic range dynamics. Focusing on this last question, we will present new methods and empirical data in Heuchera (Saxifragaceae) to address the relationship between historical climate and hybridization. We ask whether past periods of climatic dynamism have driven geographic range contact and enabled hybridization across the clade, and document a case of hybridization between distantly related clades that today are allopatric.

1 - Florida Museum Of Natural History, Dickinson Hall, 1659 Museum Road, Gainesville, FL, 32611, United States
2 - University of Florida, Department of Biology, 220 Bartram Hall, P.O. Box 118525, Gainesville, FL, 32601, USA
3 - National Museum of Nature and Science, Tsukuba Botanical Garden, Amakubo 4‐1‐1, Tsukuba, Ibaraki, 305‐0005, Japan
4 - University Of Florida, Florida Museum Of Natural History, Po Box 117800, Gainesville, FL, 32611, United States
5 - Florida Museum of Natural History, University of Florida, 1659 Museum Road, Gainesville, Florida, 32611, USA
6 - University of Florida, 1659 Museum Road, Gainesville, FL, 32611, United States

Keywords:
ancestral reconstruction
hybridization
introgression
Pleistocene
paleoclimate.

Presentation Type: Symposium Presentation
Session: SYM2, Phylogenomic Perspectives on Reproductive Isolation and Introgression
Location: San Ignacio/Starr Pass
Date: Monday, July 29th, 2019
Time: 4:45 PM
Number: SYM2008
Abstract ID:723
Candidate for Awards:None