ArticlebioRxiv : the preprint server for biology2026
Divergent habitat selection across many loci maintains species boundaries during introgression.
Article in bioRxiv : the preprint server for biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Evidence of introgression between well-defined species is abundant, begging the question, how are species boundaries maintained during introgression? Work on this question has largely focused on systems where divergence is controlled by a few large effect genetic loci. However, adaptive divergence is often highly polygenic, especially between young species that remain capable of gene exchange. Here, we use phylogeny based introgression statistics and local ancestry inference to characterize the genomic, spatial, and historical extent of introgression between two recently diverged Neotropical plant species. We then use QTL analysis to investigate the genetic basis of traits under divergent abiotic and biotic selection that are involved in habitat isolation. Finally, we combine these top-down and bottom-up approaches to clarify how species with polygenic reproductive isolation maintain cohesion in the face of gene flow. We find clear evidence of both recent and ancient introgression between
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