Divergent natural selection promotes immigrant inviability at early and late stages of evolutionary divergence

Evolution; International Journal of Organic Evolution
Spencer J Ingley, Jerald B Johnson

Abstract

Natural selection's role in speciation has been of fundamental importance since Darwin first outlined his theory. Recently, work has focused on understanding how selection drives trait divergence, and subsequently reproductive isolation. "Immigrant inviability," a barrier that arises from selection against immigrants in their nonnative environment, appears to be of particular importance. Although immigrant inviability is likely ubiquitous, we know relatively little about how selection acts on traits to drive immigrant inviability, and how important immigrant inviability is at early-versus-late stages of divergence. We present a study evaluating the role of predation in the evolution of immigrant inviability in recently diverged population pairs and a well-established species pair of Brachyrhaphis fishes. We evaluate performance in a high-predation environment by assessing survival in the presence of a predator, and swimming endurance in a low-predation environment. We find strong signatures of local adaptation and immigrant inviability of roughly the same magnitude both early and late in divergence. We find remarkably conserved selection for burst-speed swimming (important in predator evasion), and selection for increased size ...Continue Reading

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Citations

Dec 10, 2009·PLoS Genetics·Peter L OliverChris P Ponting
Jun 25, 2016·BMC Evolutionary Biology·Carolin Sommer-TremboMartin Plath
Dec 21, 2016·Evolution; International Journal of Organic Evolution·Spencer J Ingley
Mar 28, 2017·Evolution; International Journal of Organic Evolution·Josh Van Buskirk
Dec 22, 2017·Journal of Evolutionary Biology·E K Moody, M L Lozano-Vilano
Sep 27, 2018·Evolution; International Journal of Organic Evolution·Jelena RajkovBernd Egger
Aug 5, 2017·PloS One·Alireza Mazloumi GavganiEugene Nalivaiko
Jan 25, 2017·Ecology and Evolution·Elizabeth G BouldingJuan Galindo
Oct 20, 2017·Nature Ecology & Evolution·Zachary W Culumber, Michael Tobler

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