Signatures of mitonuclear coevolution in a warbler species complex

Silu Wang (), Madelyn J. Ore, Else K. Mikkelsen, Julie Lee-Yaw, David P. L. Toews, Sievert Rohwer and Darren Irwin
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Silu Wang: University of British Columbia
Madelyn J. Ore: University of British Columbia
Else K. Mikkelsen: University of British Columbia
Julie Lee-Yaw: University of British Columbia
David P. L. Toews: The Pennsylvania State University
Sievert Rohwer: University of Washington
Darren Irwin: University of British Columbia

Nature Communications, 2021, vol. 12, issue 1, 1-11

Abstract: Abstract Divergent mitonuclear coadaptation could facilitate speciation. We investigate this possibility in two hybridizing species of warblers, Setophaga occidentalis and S. townsendi, in western North America. Inland S. townsendi harbor distinct mitochondrial DNA haplotypes from those of S. occidentalis. These populations also differ in several nuclear DNA regions. Coastal S. townsendi demonstrate mixed mitonuclear ancestry from S. occidentalis and inland S. townsendi. Of the few highly-differentiated chromosomal regions between inland S. townsendi and S. occidentalis, a 1.2 Mb gene block on chromosome 5 is also differentiated between coastal and inland S. townsendi. Genes in this block are associated with fatty acid oxidation and energy-related signaling transduction, thus linked to mitochondrial functions. Genetic variation within this candidate gene block covaries with mitochondrial DNA and shows signatures of divergent selection. Spatial variation in mitonuclear ancestries is correlated with climatic conditions. Together, these observations suggest divergent mitonuclear coadaptation underpins cryptic differentiation in this species complex.

Date: 2021
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DOI: 10.1038/s41467-021-24586-8

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