Mimetic Divergence and the Speciation Continuum in the Mimic Poison Frog Ranitomeya imitator

The American Naturalist
Evan TwomeyKyle Summers

Abstract

While divergent ecological adaptation can drive speciation, understanding the factors that facilitate or constrain this process remains a major goal in speciation research. Here, we study two mimetic transition zones in the poison frog Ranitomeya imitator, a species that has undergone a Müllerian mimetic radiation to establish four morphs in Peru. We find that mimetic morphs are strongly phenotypically differentiated, producing geographic clines with varying widths. However, distinct morphs show little neutral genetic divergence, and landscape genetic analyses implicate isolation by distance as the primary determinant of among-population genetic differentiation. Mate choice experiments suggest random mating at the transition zones, although certain allopatric populations show a preference for their own morph. We present evidence that this preference may be mediated by color pattern specifically. These results contrast with an earlier study of a third transition zone, in which a mimetic shift was associated with reproductive isolation. Overall, our results suggest that the three known mimetic transition zones in R. imitator reflect a speciation continuum, which we have characterized at the geographic, phenotypic, behavioral, and...Continue Reading

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Citations

Oct 26, 2016·Evolution; International Journal of Organic Evolution·Yusan YangMatthew B Dugas
Dec 1, 2017·Ecology and Evolution·Alexandre B RolandLauren A O'Connell
Oct 17, 2018·Current Zoology·Jeanne Marie RobertsonKristine Kaiser
Jan 27, 2019·Scientific Reports·Kate D L UmbersJohanna Mappes
Jun 9, 2017·Proceedings. Biological Sciences·C MérotM Joron
Aug 16, 2017·Nature Ecology & Evolution·Patrik NosilZachariah Gompert
Aug 29, 2018·Biological Reviews of the Cambridge Philosophical Society·Emmanuelle S BriolatAdam M M Stuckert
Jul 14, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Moritz MuschickPatrik Nosil
May 10, 2020·Nature Reviews. Genetics·Anna Orteu, Chris D Jiggins
Jan 5, 2021·Ecology and Evolution·Justin Yeager, James B Barnett
Mar 5, 2021·Scientific Reports·Irina Birskis-BarrosPaulo R Guimarães

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