Recent hybrids recapitulate ancient hybrid outcomes

Samridhi Chaturvedi, Lauren K. Lucas, C. Alex Buerkle, James A. Fordyce, Matthew L. Forister, Chris C. Nice and Zachariah Gompert ()
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Samridhi Chaturvedi: Utah State University
Lauren K. Lucas: Utah State University
C. Alex Buerkle: University of Wyoming
James A. Fordyce: University of Tennessee
Matthew L. Forister: University of Nevada
Chris C. Nice: Texas State University
Zachariah Gompert: Utah State University

Nature Communications, 2020, vol. 11, issue 1, 1-15

Abstract: Abstract Genomic outcomes of hybridization depend on selection and recombination in hybrids. Whether these processes have similar effects on hybrid genome composition in contemporary hybrid zones versus ancient hybrid lineages is unknown. Here we show that patterns of introgression in a contemporary hybrid zone in Lycaeides butterflies predict patterns of ancestry in geographically adjacent, older hybrid populations. We find a particularly striking lack of ancestry from one of the hybridizing taxa, Lycaeides melissa, on the Z chromosome in both the old and contemporary hybrids. The same pattern of reduced L. melissa ancestry on the Z chromosome is seen in two other ancient hybrid lineages. More generally, we find that patterns of ancestry in old or ancient hybrids are remarkably predictable from contemporary hybrids, which suggests selection and recombination affect hybrid genomes in a similar way across disparate time scales and during distinct stages of speciation and species breakdown.

Date: 2020
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DOI: 10.1038/s41467-020-15641-x

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