Genetic architecture in a marine hybrid zone: comparing outlier detection and genomic clines analysis in the bivalve Macoma balthica

Molecular Ecology
P C LuttikhuizenK Johannesson

Abstract

The role of natural selection in speciation has received increasing attention and support in recent years. Different types of approaches have been developed that can detect genomic regions influenced by selection. Here, we address the question whether two highly different methods--F(ST) outlier analysis and admixture analysis--detect largely the same set of non-neutral genomic elements or, instead, complementary sets. We study genetic architecture in a natural secondary contact zone where extensive admixture occurs. The marine bivalves Macoma balthica rubra and M. b. balthica descend from two independent trans-Arctic invasions of the north Atlantic and hybridize extensively where they meet, for example in the Kattegat-Danish Straits-Baltic Sea region. The Kattegat-Danish Straits region forms a steep salinity cline and is the only entrance to the recently (ca. 8000 years ago) established brackish water basin the Baltic Sea. Salinity along the contact zone drops from 30‰ (Skagerrak, M.b.rubra) to 3‰ (Baltic, M.b.balthica). Both outlier analysis and genomic clines analysis suggest that large parts of the genome are influenced by non-neutral effects. Contrasting samples from well outside the hybrid zone, outlier analysis detects 16...Continue Reading

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Citations

Aug 21, 2014·Evolution; International Journal of Organic Evolution·Scott A TaylorIrby Lovette
Mar 7, 2013·Evolution; International Journal of Organic Evolution·Victoria L Pritchard, Suzanne Edmands
Sep 17, 2013·Evolution; International Journal of Organic Evolution·Jacquelin DeFaveriJuha Merilä
Dec 5, 2013·Evolution; International Journal of Organic Evolution·Erica L LarsonRichard G Harrison
Jun 20, 2014·The New Phytologist·Catherine I CullinghamDavid W Coltman
Aug 9, 2017·Journal of Evolutionary Biology·M RavinetA M Westram
Jun 24, 2020·Journal of Evolutionary Biology·Erica H LederOla Svensson
Jun 16, 2017·Ecology and Evolution·Guillaume de Lafontaine, Jean Bousquet
Sep 11, 2020·Evolutionary Applications·María QuintelaKevin A Glover
Sep 12, 2020·Trends in Ecology & Evolution·Kerstin JohannessonCarl André

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