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The phoenix hypothesis of speciation

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Proc. R. Soc. B-Biol. Sci._289(1987)_20221186.pdf3.49 MBPDFView/Open
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Title: The phoenix hypothesis of speciation
Authors: Yamaguchi, Ryo Browse this author →KAKEN DB
Wiley, Bryn Browse this author
Otto, Sarah P. Browse this author
Keywords: evolutionary rescue
extinction risk
large-effect mutations
parallel adaptation
postzygotic isolation
Issue Date: 16-Nov-2022
Publisher: Royal Society
Journal Title: Proceedings of the royal society b-biological sciences
Volume: 289
Issue: 1987
Start Page: 20221186
Publisher DOI: 10.1098/rspb.2022.1186
Abstract: Genetic divergence among allopatric populations builds reproductive isolation over time. This process is accelerated when populations face a changing environment that allows large-effect mutational differences to accumulate, but abrupt change also places populations at risk of extinction. Here we use simulations of Fisher's geometric model with explicit population dynamics to explore the genetic changes that occur in the face of environmental changes. Because evolutionary rescue leads to the fixation of mutations whose phenotypic effects are larger on average compared with populations not at risk of extinction, these mutations are thus more likely to lead to reproductive isolation. We refer to the formation of new species from the ashes of populations in decline as the phoenix hypothesis of speciation. The phoenix hypothesis predicts more substantial hybrid fitness breakdown among populations surviving a higher extinction risk. The hypothesis was supported when many loci underlie adaptation. With only a small number of potential rescue mutations, however, mutations that fixed in different populations were more likely to be identical, with such parallel changes reducing isolation. Consequently, reproductive isolation builds fastest in populations subject to an intermediate extinction risk, given a limited number of mutations available for adaptation.
Type: article (author version)
Appears in Collections:生命科学院・先端生命科学研究院 (Graduate School of Life Science / Faculty of Advanced Life Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山口 諒

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