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"El no va más: Avian diversification within oceanic islands" Borja Milá Investigador Distinguido Departamento Biodiversidad y Biología Evolutiva Museo Nacional de Ciencias Naturales - CSIC https://borjamila.com Recently diverged taxa showing marked phenotypic and ecological diversity are optimal systems to understand the genetic processes underlying speciation. We used genome-wide markers to investigate the diversification of the Reunion gray white eye (Zosterops borbonicus) on the small volcanic island of Reunion (Mascarene archipelago), where this species complex exhibits four geographic forms that are parapatrically distributed across the island and differ strikingly in plumage color. Using population genomic and phylogenetic analyses, we reconstructed the population history of the different forms and confirmed the monophyly of the complex. One form restricted to the highlands is separated by a steep ecological gradient from three distinct lowland forms which meet at narrow hybrid zones that are not associated with environmental variables. Landscapes of genomic variation reveal that signatures of selection associated with elevation can be found at multiple regions across the genome, whereas most loci associated with the lowland forms are located on the Z sex chromosome. We identified TYRP1, a Z-linked color gene, as a likely candidate locus underlying color variation among lowland forms. Overall, low dispersal capabilities in this island bird combined with both geographical and ecological opportunities seem to explain how divergence occurred at such a small spatial scale. I will also present some new results from a similar case of recent within-island divergence driven by ecological opportunity in the common chaffinch (Fringilla coelebs) within the island of La Palma.

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