Repeated and predictable patterns of ecotypic differentiation during a biological invasion: lake-stream divergence in parapatric Swiss stickleback

Lucek, K.; Sivasundar, A.; Roy, D.; Seehausen, O. (2013). Repeated and predictable patterns of ecotypic differentiation during a biological invasion: lake-stream divergence in parapatric Swiss stickleback. Journal of Evolutionary Biology, 26(12), pp. 2691-2709. Wiley 10.1111/jeb.12267

[img] Text
Lucek_etal_JEB_2013.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (2MB) | Request a copy

The relative importance of ecological selection and geographical isolation in promoting and constraining genetic and phenotypic differentiation among populations is not always obvious. Interacting with divergent selection, restricted opportunity for gene flow may in some cases be as much a cause as a consequence of adaptation, with the latter being a hallmark of ecologi- cal speciation. Ecological speciation is well studied in parts of the native range of the three-spined stickleback. Here, we study this process in a recently invaded part of its range. Switzerland was colonized within the past 140 years from at least three different colonization events involving differ- ent stickleback lineages. They now occupy diverse habitats, ranging from small streams to the pelagic zone of large lakes. We use replicated systems of parapatric lake and stream populations, some of which trace their origins to different invasive lineages, to ask (i) whether phenotypic divergence occurred among populations inhabiting distinct habitats, (ii) whether trajec- tories of phenotypic divergence follow predictable parallel patterns and (iii) whether gene flow constrains divergent adaptation or vice versa. We find consistent phenotypic divergence between populations occupying distinct habitats. This involves parallel evolution in several traits with known eco- logical relevance in independent evolutionary lineages. Adaptive divergence supersedes homogenizing gene flow even at a small spatial scale. We find evidence that adaptive phenotypic divergence places constraints on gene flow over and above that imposed by geographical distance, signalling the early onset of ecological speciation.

Item Type:

Journal Article (Original Article)

Division/Institute:

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

UniBE Contributor:

Lucek, Kay Jurka Olaf; Sivasundar, Arjun and Seehausen, Ole

Subjects:

500 Science > 570 Life sciences; biology

ISSN:

1010-061X

Publisher:

Wiley

Language:

English

Submitter:

Marcel Häsler

Date Deposited:

29 Apr 2014 11:12

Last Modified:

08 Sep 2015 09:58

Publisher DOI:

10.1111/jeb.12267

BORIS DOI:

10.7892/boris.44984

URI:

https://boris.unibe.ch/id/eprint/44984

Actions (login required)

Edit item Edit item
Provide Feedback