Disentangling Population History and Character Evolution among Hybridizing Lineages

Abstract Understanding the origin and maintenance of adaptive phenotypic novelty is a central goal of evolutionary biology. However, both hybridization and incomplete lineage sorting can lead to genealogical discordance between the regions of the genome underlying adaptive traits and the remainder o...

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Bibliographic Details
Published in:Molecular biology and evolution 2020-05, Vol.37 (5), p.1295-1305
Main Authors: Mullen, Sean P, VanKuren, Nicholas W, Zhang, Wei, Nallu, Sumitha, Kristiansen, Evan B, Wuyun, Qiqige, Liu, Kevin, Hill, Ryan I, Briscoe, Adriana D, Kronforst, Marcus R
Format: Article
Language:English
Subjects:
Animals
Biological Evolution
Biological Mimicry - genetics
Butterflies - genetics
Discoveries
Female
Genetic Introgression
Genome, Insect
Haplotypes
Male
North America
Phylogeography
Selection, Genetic
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Summary:Abstract Understanding the origin and maintenance of adaptive phenotypic novelty is a central goal of evolutionary biology. However, both hybridization and incomplete lineage sorting can lead to genealogical discordance between the regions of the genome underlying adaptive traits and the remainder of the genome, decoupling inferences about character evolution from population history. Here, to disentangle these effects, we investigated the evolutionary origins and maintenance of Batesian mimicry between North American admiral butterflies (Limenitis arthemis) and their chemically defended model (Battus philenor) using a combination of de novo genome sequencing, whole-genome resequencing, and statistical introgression mapping. Our results suggest that balancing selection, arising from geographic variation in the presence or absence of the unpalatable model, has maintained two deeply divergent color patterning haplotypes that have been repeatedly sieved among distinct mimetic and nonmimetic lineages of Limenitis via introgressive hybridization.
ISSN:0737-4038
1537-1719
DOI:10.1093/molbev/msaa004