Admixture between old lineages facilitated contemporary ecological speciation in Lake Constance stickleback

Marques, David A.; Lucek, Kay; Sousa, Vitor; Excoffier, Laurent; Seehausen, Ole (2019). Admixture between old lineages facilitated contemporary ecological speciation in Lake Constance stickleback. Nature communications, 10(1) Nature Publishing Group 10.1038/s41467-019-12182-w

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Ecological speciation can sometimes rapidly generate reproductively isolated populations coexisting in sympatry, but the origin of genetic variation permitting this is rarely known. We previously explored the genomics of very recent ecological speciation into lake and stream ecotypes in stickleback from Lake Constance. Here, we reconstruct the origin of alleles underlying ecological speciation by combining demographic modelling on genome-wide single nucleotide polymorphisms, phenotypic data and mitochondrial sequence data in the wider European biogeographical context. We find that parallel differentiation between lake and stream ecotypes across replicate lake-stream ecotones resulted from recent secondary contact and admixture between old East and West European lineages. Unexpectedly, West European alleles that introgressed across the hybrid zone at the western end of the lake, were recruited to genomic islands of differentiation between ecotypes at the eastern end of the lake. Our results highlight an overlooked outcome of secondary contact: ecological speciation facilitated by admixture variation.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE)
08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE) > Population Genetics
08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE) > Aquatic Ecology

UniBE Contributor:

Marques, David Alexander; Lucek, Kay Jurka Olaf; Martins Conde e Sousa, Vitor; Excoffier, Laurent and Seehausen, Ole

Subjects:

500 Science > 570 Life sciences; biology

ISSN:

2041-1723

Publisher:

Nature Publishing Group

Language:

English

Submitter:

Marcel Häsler

Date Deposited:

23 Sep 2019 10:36

Last Modified:

24 Oct 2019 02:58

Publisher DOI:

10.1038/s41467-019-12182-w

BORIS DOI:

10.7892/boris.133398

URI:

https://boris.unibe.ch/id/eprint/133398

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