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  • 1.
    Rettelbach, Agnes
    et al.
    University of Vienna.
    Kopp, Michael
    University of Vienna.
    Dieckmann, Ulf
    IIASA.
    Hermisson, Joachim
    University of Vienna.
    Effects of genetic architecture on the evolution of assortative mating under frequency-dependent disruptive selection2011In: Theoretical Population Biology, ISSN 0040-5809, E-ISSN 1096-0325, no 79, p. 82-96Article in journal (Refereed)
  • 2.
    Rettelbach, Agnes
    et al.
    University of Vienna.
    Kopp, Michael
    University of Vienna.
    Dieckmann, Ulf
    IIASA.
    Hermisson, Joachim
    University of Vienna.
    Three Modes of Adaptive Speciation in Spatially Structured Populations.2013In: American Naturalist, ISSN 0003-0147, E-ISSN 1537-5323, no 182, p. E215-E234Article in journal (Refereed)
  • 3.
    Rettelbach, Agnes
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Evolutionary Biology.
    Nater, Alexander
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Evolutionary Biology. Univ Konstanz, Dept Biol, D-78457 Constance, Germany.
    Ellegren, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Evolutionary Biology.
    How Linked Selection Shapes the Diversity Landscape in Ficedula Flycatchers2019In: Genetics, ISSN 0016-6731, E-ISSN 1943-2631, Vol. 212, no 1, p. 277-285Article in journal (Refereed)
    Abstract [en]

    There is an increasing awareness that selection affecting linked neutral sites strongly influences on how diversity is distributed across the genome. In particular, linked selection is likely involved in the formation of heterogenous landscapes of genetic diversity, including genomic regions with locally reduced effective population sizes that manifest as dips in diversity, and "islands" of differentiation between closely related populations or species. Linked selection can be in the form of background selection or selective sweeps, and a long-standing quest in population genetics has been to unveil the relative importance of these processes. Here, we analyzed the theoretically expected reduction of diversity caused by linked selection in the collared flycatcher (Ficedula albicollis) genome and compared this with population genomic data on the distribution of diversity across the flycatcher genome. By incorporating data on recombination rate variation and the density of target sites for selection (including both protein-coding genes and conserved noncoding elements), we found that background selection can explain most of the observed baseline variation in genetic diversity. However, positive selection was necessary to explain the pronounced local diversity dips in the collared flycatcher genome. We confirmed our analytical findings by comprehensive simulations. Therefore, our study demonstrates that even though both background selection and selective sweeps contribute to the heterogeneous diversity landscape seen in this avian system, they play different roles in shaping it.

  • 4.
    Rettelbach, Agnes
    et al.
    Univ Vienna, Dept Math, Vienna, Austria.
    Servedio, Maria
    Univ N Carolina, Dept Biol, Chapel Hill, NC USA.
    Hermisson, Joachim
    Univ Vienna, Dept Math, Vienna, Austria.; Univ Vienna, Max Perutz Labs, Vienna, Austria.
    Speciation in peripheral populations: effects of drift load and mating systems2016In: Journal of Evolutionary Biology, ISSN 1010-061X, E-ISSN 1420-9101, Vol. 29, no 5, p. 1073-1090Article in journal (Refereed)
    Abstract [en]

    Speciation in peripheral populations has long been considered one of the most plausible scenarios for speciation with gene flow. In this study, however we identify two additional problems of peripatric speciation, as compared to the parapatric case, that may impede the completion of the speciation process for most parameter regions. First, with (predominantly) unidirectional gene flow, there is no selection pressure to evolve assortative mating on the continent. We discuss the implications of this for different mating schemes. Second, genetic load can build up in small populations. This can lead to extinction of the peripheral species, or generate selection pressure for lower assortative mating to avoid inbreeding. In this case, either a stable equilibrium with intermediate assortment evolves or there is cycling between phases of hybridization and phases of complete isolation.

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