Distinct colonization waves underlie the diversification of the freshwater sculpin ( Cottus gobio ) in the Central European Alpine region

Lucek, Kay Jurka Olaf; Keller, Irene; Nolte, Arne W.; Seehausen, Ole (2018). Distinct colonization waves underlie the diversification of the freshwater sculpin ( Cottus gobio ) in the Central European Alpine region (In Press). Journal of Evolutionary Biology Wiley 10.1111/jeb.13339

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Ecological speciation and adaptive radiation are key processes shaping northern temperate freshwater fish diversity. Both often involve parapatric differentiation between stream and lake populations and less often, sympatric intralacustrine diversification into habitat- and resource-associated ecotypes. However, few taxa have been studied, calling for studies of others to investigate the generality of these processes. Here, we test for diversification within catchments in freshwater sculpins in a network of peri-Alpine lakes and streams. Using 8,047 and 13,182 restriction site associated (RADseq) SNPs respectively we identify three deeply divergent phylogeographic lineages associated with different major European drainages. Within the Aare/Rhine catchment, we observe populations from geographically distant lakes to be genetically more similar to each other than to populations from nearby streams. This pattern is consistent with two distinct colonization waves, rather than by parapatric ecological speciation after a single colonization wave. We further find two distinct depth distribution modes in three lakes of the Aare catchment, one in very shallow and one in very deep water, and significant genome-wide differentiation between these in one lake. Sculpins in the Aare catchment appear to represent an early stage adaptive radiation involving the evolution of a lacustrine lineage distinct from parapatric stream sculpins, and the repeated onset of depth-related intralacustrine differentiation.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE) > Aquatic Ecology
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > DCR Services > Genomics
08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE)

UniBE Contributor:

Lucek, Kay Jurka Olaf; Keller, Irene and Seehausen, Ole

Subjects:

500 Science > 570 Life sciences; biology

ISSN:

1010-061X

Publisher:

Wiley

Language:

English

Submitter:

Marcel Häsler

Date Deposited:

26 Jun 2018 15:17

Last Modified:

06 Jul 2018 08:23

Publisher DOI:

10.1111/jeb.13339

BORIS DOI:

10.7892/boris.117395

URI:

https://boris.unibe.ch/id/eprint/117395

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