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Speciation Rates01:07

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Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.
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Migration00:53

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Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
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Extreme elevational migration spurred cryptic speciation in giant hummingbirds.

Jessie L Williamson1,2,3,4, Ethan F Gyllenhaal1,2, Selina M Bauernfeind1

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Proceedings of the National Academy of Sciences of the United States of America
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The giant hummingbird

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Area of Science:

  • Ecoevolutionary biology
  • Biodiversity research
  • Ornithology

Background:

  • Species niche dynamics are crucial for biodiversity but difficult to study.
  • Niche expansion can be driven by local adaptation or limited by physiological trade-offs.
  • Evolutionary shifts in migratory behavior can broaden avian climatic niches.

Purpose of the Study:

  • Investigate the ecoevolutionary drivers of niche breadth in the giant hummingbird (Patagona gigas).
  • Determine the roles of migratory behavior, performance trade-offs, and genetic structure in maintaining its broad niche.
  • Understand the evolutionary limits on niche breadth and the speciation process.

Main Methods:

  • Utilized satellite and light-level geolocator tracking to study movement patterns.
  • Analyzed respiratory traits and population genomics.
  • Compared high-elevation resident populations with the giant hummingbird.

Main Results:

  • Documented an >8,300-km loop migration in the giant hummingbird, including a significant high-altitude ascent.
  • Observed deep genomic divergence and postzygotic barriers between the giant hummingbird and high-elevation resident populations.
  • Identified a previously undiscovered species of large hummingbird coexisting with the giant hummingbird.

Conclusions:

  • Extreme migratory behavior in the ancestral giant hummingbird facilitated niche expansion.
  • This expansion led to speciation, resulting in distinct high-elevation resident populations and the giant hummingbird.
  • The study reveals evolutionary limits on niche breadth and the role of extreme migration in driving speciation.