Geographic Variation in Genomic Signals of Admixture Between Two Closely Related European Sepsid Fly Species.

Autor: Giesen A; Department of Evolutionary Biology and Environmental Studies, University of Zürich, Winterthurerstrasse 190, 8057 Zurich, Switzerland., Blanckenhorn WU; Department of Evolutionary Biology and Environmental Studies, University of Zürich, Winterthurerstrasse 190, 8057 Zurich, Switzerland., Schäfer MA; Department of Evolutionary Biology and Environmental Studies, University of Zürich, Winterthurerstrasse 190, 8057 Zurich, Switzerland., Shimizu KK; Department of Evolutionary Biology and Environmental Studies, University of Zürich, Winterthurerstrasse 190, 8057 Zurich, Switzerland., Shimizu-Inatsugi R; Department of Evolutionary Biology and Environmental Studies, University of Zürich, Winterthurerstrasse 190, 8057 Zurich, Switzerland., Misof B; Zoological Research Museum Alexander Koenig, Bonn, Germany., Podsiadlowski L; Zoological Research Museum Alexander Koenig, Bonn, Germany., Niehuis O; Department of Evolutionary Biology and Ecology, Institute of Biology I (Zoology), Albert Ludwig University, Freiburg, Germany., Lischer HEL; Department of Evolutionary Biology and Environmental Studies, University of Zürich, Winterthurerstrasse 190, 8057 Zurich, Switzerland.; Interfaculty Bioinformatics Unit, University of Bern, Bern, Switzerland., Aeschbacher S; Department of Evolutionary Biology and Environmental Studies, University of Zürich, Winterthurerstrasse 190, 8057 Zurich, Switzerland., Kapun M; Department of Evolutionary Biology and Environmental Studies, University of Zürich, Winterthurerstrasse 190, 8057 Zurich, Switzerland.; Division of Cell & Developmental Biology, Medical University of Vienna, Vienna, Austria.; Natural History Museum Vienna, Burgring 7, 1010 Vienna, Austria.
Jazyk: angličtina
Zdroj: Evolutionary biology [Evol Biol] 2023; Vol. 50 (4), pp. 395-412. Date of Electronic Publication: 2023 Aug 25.
DOI: 10.1007/s11692-023-09612-5
Abstrakt: The extent of interspecific gene flow and its consequences for the initiation, maintenance, and breakdown of species barriers in natural systems remain poorly understood. Interspecific gene flow by hybridization may weaken adaptive divergence, but can be overcome by selection against hybrids, which may ultimately promote reinforcement. An informative step towards understanding the role of gene flow during speciation is to describe patterns of past gene flow among extant species. We investigate signals of admixture between allopatric and sympatric populations of the two closely related European dung fly species Sepsis cynipsea and S. neocynipsea (Diptera: Sepsidae). Based on microsatellite genotypes, we first inferred a baseline demographic history using Approximate Bayesian Computation. We then used genomic data from pooled DNA of natural and laboratory populations to test for past interspecific gene flow based on allelic configurations discordant with the inferred population tree (ABBA-BABA test with D -statistic). Comparing the detected signals of gene flow with the contemporary geographic relationship among interspecific pairs of populations (sympatric vs. allopatric), we made two contrasting observations. At one site in the French Cevennes, we detected an excess of past interspecific gene flow, while at two sites in Switzerland we observed lower signals of past microsatellite genotypes gene flow among populations in sympatry compared to allopatric populations. These results suggest that the species boundaries between these two species depend on the past and/or present eco-geographic context in Europe, which indicates that there is no uniform link between contemporary geographic proximity and past interspecific gene flow in natural populations.
Supplementary Information: The online version contains supplementary material available at 10.1007/s11692-023-09612-5.
Competing Interests: Competing interestThe authors declare no competing interests.
(© The Author(s) 2023.)
Databáze: MEDLINE
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