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Parallelism and historical contingency during rapid ecotype divergence in an isopod
Section for Animal Ecology, Lund University, Lund, Sweden.
Linköping University, Department of Physics, Chemistry and Biology, Biology. Linköping University, The Institute of Technology.
Department of Ecology & Evolutionary Biology, University of California, Santa Cruz, CA, USA.
The EGI, Department of Zoology, Oxford, UK.
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2009 (English)In: Journal of Evolutionary Biology, ISSN 1010-061X, E-ISSN 1420-9101, Vol. 22, no 5, 1098-1110 p.Article in journal (Refereed) Published
Abstract [en]

Recent studies on parallel evolution have focused on the relative role of selection and historical contingency during adaptive divergence. Here, we study geographically separate and genetically independent lake populations of a freshwater isopod (Asellus aquaticus) in southern Sweden. In two of these lakes, a novel habitat was rapidly colonized by isopods from a source habitat. Rapid phenotypic changes in pigmentation, size and sexual behaviour have occurred, presumably in response to different predatory regimes. We partitioned the phenotypic variation arising from habitat (selection: 81-94%), lake (history: 0.1-6%) and lake x habitat interaction (unique diversification: 0.4-13%) for several traits. There was a limited role for historical contingency but a strong signature of selection. We also found higher phenotypic variation in the source populations. Phenotype sorting during colonization and strong divergent selection might have contributed to these rapid changes. Consequently, phenotypic divergence was only weakly influenced by historical contingency.

Place, publisher, year, edition, pages
Chichester, West Sussex, United Kingdom: Wiley-Blackwell, 2009. Vol. 22, no 5, 1098-1110 p.
Keyword [en]
adaptive radiation, historical contingency, mating propensity, parallel evolution, phenotype sorting, pigmentation
National Category
URN: urn:nbn:se:liu:diva-18027DOI: 10.1111/j.1420-9101.2009.01723.xOAI: diva2:214271
Available from: 2009-05-04 Created: 2009-05-04 Last updated: 2014-01-16Bibliographically approved

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