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  • Please use this identifier to cite or link to this item: https://repositorio.uti.edu.ec//handle/123456789/2990
    Title: Habitat-linked genetic variation supports microgeographic adaptive divergence in an island-endemic bird species
    Authors: Cheek, Rebecca
    Forester, Brenna
    Salermo, Patricia
    Trumbo, Daryl
    Langin, Kathryn
    Chen, Nancy
    Scott, Sillet
    Morrison, Scott
    Ghalambor, Cameron
    Chris, Funk
    Issue Date: 2022
    Publisher: Molecular Ecology. Volume 31, Issue 10, Pages 2830 - 2846
    Abstract: We investigated the potential mechanisms driving habitat-linked genetic divergence within a bird species endemic to a single 250-km2 island. The island scrub-jay (Aphelocoma insularis) exhibits microgeographic divergence in bill morphology across pine–oak ecotones on Santa Cruz Island, California (USA), similar to adaptive differences described in mainland congeners over much larger geographic scales. To test whether individuals exhibit genetic differentiation related to habitat type and divergence in bill length, we genotyped over 3000 single nucleotide polymorphisms in 123 adult island scrub-jay males from across Santa Cruz Island using restriction site-associated DNA sequencing. Neutral landscape genomic analyses revealed that genome-wide genetic differentiation was primarily related to geographic distance and differences in habitat composition. We also found 168 putatively adaptive loci associated with habitat type using multivariate redundancy analysis while controlling for spatial effects. Finally, two genome-wide association analyses revealed a polygenic basis to variation in bill length with multiple loci detected in or near genes known to affect bill morphology in other birds. Our findings support the hypothesis that divergent selection at microgeographic scales can cause adaptive divergence in the presence of ongoing gene flow.
    URI: https://onlinelibrary.wiley.com/doi/10.1111/mec.16438
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