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The Dynamics of Incomplete Lineage Sorting across the Ancient Adaptive Radiation of Neoavian Birds

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Suh, Alexander, Smeds, Linnéa, Ellegren, Hans·2015·PLOS Biology

Abstract

The diversification of neoavian birds is one of the most rapid adaptive radiations of extant organisms. Recent whole-genome sequence analyses have much improved the resolution of the neoavian radiation and suggest concurrence with the Cretaceous-Paleogene (K-Pg) boundary, yet the causes of the remaining genome-level irresolvabilities appear unclear. Here we show that genome-level analyses of 2,118 retrotransposon presence/absence markers converge at a largely consistent Neoaves phylogeny and detect a highly differential temporal prevalence of incomplete lineage sorting (ILS), i.e., the persistence of ancestral genetic variation as polymorphisms during speciation events. We found that ILS-derived incongruences are spread over the genome and involve 35% and 34% of the analyzed loci on the autosomes and the Z chromosome, respectively. Surprisingly, Neoaves diversification comprises three adaptive radiations, an initial near-K-Pg super-radiation with highly discordant phylogenetic signals from near-simultaneous speciation events, followed by two post-K-Pg radiations of core landbirds and core waterbirds with much less pronounced ILS. We provide evidence that, given the extreme level of up to 100% ILS per branch in super-radiations, particularly rapid speciation events may neither resemble a fully bifurcating tree nor are they resolvable as such. As a consequence, their complex demographic history is more accurately represented as local networks within a species tree.

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Metadata

Authors
Suh, A., Smeds, L., & Ellegren, H.
Venue
PLOS Biology
Published
2015-08-18
Volume
13
Issue
8
Pages
e1002224
ISSN
  • 1544-9173 (ISSN-L)
  • 1545-7885
OpenAlex
W1946807837
Cited by
277
References
58
FWCI
10.81
Type
journal article
Language
en
Open access
gold

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CoChat. (2026). Citation check: The Dynamics of Incomplete Lineage Sorting across the Ancient Adaptive Radiation of Neoavian Birds. https://app.cochat.ai/papers/10.1371/journal.pbio.1002224
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Suh, A., Smeds, L., & Ellegren, H. (2015). The Dynamics of Incomplete Lineage Sorting across the Ancient Adaptive Radiation of Neoavian Birds. PLOS Biology. https://doi.org/10.1371/journal.pbio.1002224

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