Extreme elevational migration spurred cryptic speciation in giant hummingbirds

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dc.contributor.authorWilliamson, Jessie L.
dc.contributor.authorGyllenhaal, Ethan F.
dc.contributor.authorBauernfeind, Selina M.
dc.contributor.authorBautista, Emil
dc.contributor.authorBaumann, Matthew J.
dc.contributor.authorGadek, Chauncey R.
dc.contributor.authorMarra, Peter P.
dc.contributor.authorRicote, Natalia
dc.contributor.authorValqui, Thomas
dc.contributor.authorBozinovic, Francisco
dc.contributor.authorSingh, Nadia D.
dc.contributor.authorWitt, Christopher C.
dc.date.accessioned2025-01-20T16:17:25Z
dc.date.available2025-01-20T16:17:25Z
dc.date.issued2024
dc.description.abstractThe ecoevolutionary drivers of species niche expansion or contraction are critical for biodiversity but challenging to infer. Niche expansion may be promoted by local adaptation or constrained by physiological performance trade-offs. For birds, evolutionary shifts in migratory behavior permit the broadening of the climatic niche by expansion into varied, seasonal environments. Broader niches can be short-lived if diversifying selection and geography promote speciation and niche subdivision across climatic gradients. To illuminate niche breadth dynamics, we can ask how "outlier" species defy constraints. Of the 363 hummingbird species, the giant hummingbird (Patagona gigas) has the broadest climatic niche by a large margin. To test the roles of migratory behavior, performance trade-offs, and genetic structure in maintaining its exceptional niche breadth, we studied its movements, respiratory traits, and population genomics. Satellite and light-level geolocator tracks revealed an >8,300-km loop migration over the Central Andean Plateau. This migration included a 3-wk, similar to 4,100-m ascent punctuated by upward bursts and pauses, resembling the acclimatization routines of human mountain climbers, and accompanied by surging blood-hemoglobin concentrations. Extreme migration was accompanied by deep genomic divergence from high-elevation resident populations, with decisive postzygotic barriers to gene flow. The two forms occur side-by-side but differ almost imperceptibly in size, plumage, and respiratory traits. The high-elevation resident taxon is the world's largest hummingbird, a previously undiscovered species that we describe and name here. The giant hummingbirds demonstrate evolutionary limits on niche breadth: when the ancestral niche expanded due to evolution (or loss) of an extreme migratory behavior, speciation followed.
dc.fuente.origenWOS
dc.identifier.doi10.1073/pnas.2313599121
dc.identifier.eissn1091-6490
dc.identifier.issn0027-8424
dc.identifier.urihttps://doi.org/10.1073/pnas.2313599121
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/90596
dc.identifier.wosidWOS:001231201400004
dc.issue.numero21
dc.language.isoen
dc.revistaProceedings of the national academy of sciences of the united states of america
dc.rightsacceso restringido
dc.subjectcryptic speciation
dc.subjectelevational migration
dc.subjecthigh-altitude biology
dc.subjecthummingbirds
dc.subjectpopulation genomics
dc.subject.ods03 Good Health and Well-being
dc.subject.odspa03 Salud y bienestar
dc.titleExtreme elevational migration spurred cryptic speciation in giant hummingbirds
dc.typeartículo
dc.volumen121
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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