Molecular evolutionary consequences of island colonization

James, Jennifer E, Lanfear, Robert and Eyre-Walker, Adam (2016) Molecular evolutionary consequences of island colonization. Genome Biology and Evolution, 8 (6). pp. 1876-1888. ISSN 1759-6653

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Abstract

Island endemics are expected to have low effective population sizes (Ne), first because some may experience population bottlenecks when they are founded, and second because they have restricted ranges. Therefore, we expect island species to have reduced genetic diversity, inefficient selection, and reduced adaptive potential compared with their mainland counterparts. We used both polymor- phism and substitution data to address these predictions, improving on the approach of recent studies that only used substitution data. This allowed us to directly test the assumption that island species have small values of Ne. We found that island species had significantly less genetic diversity than mainland species; however, this pattern could be attributed to a subset of island species that appeared to have undergone a recent population bottleneck. When these species were excluded from the analysis, island and mainland species had similar levels of genetic diversity, despite island species occupying considerably smaller areas than their mainland counterparts. We also found no overall difference between island and mainland species in terms of the effectiveness of selection or the mutation rate. Our evidence suggests that island colonization has no lasting impact on molecular evolution. This surprising result highlights gaps in our knowledge of the relationship between census and effective population size.

Item Type: Article
Schools and Departments: School of Life Sciences > Evolution, Behaviour and Environment
Depositing User: Adam Eyre-Walker
Date Deposited: 14 Jul 2016 12:39
Last Modified: 06 Mar 2017 23:28
URI: http://sro.sussex.ac.uk/id/eprint/62013

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Project NameSussex Project NumberFunderFunder Ref
Sussex-2013-DTG Funding 1 StudentshipG1165NERC-NATURAL ENVIRONMENT RESEARCH COUNCILNE/L502042/1