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Population genomics of natural and experimental populations of guppies (Poecilia reticulata)
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posted on 2023-06-09, 00:49 authored by Bonnie Fraser, Axel Kunstner, David N Reznick, Christine Dreyer, Detlef WeigelConvergent evolution represents one of the best lines of evidence for adaptation, but few cases of phenotypic convergence are understood at the genetic level. Guppies inhabiting the Northern Mountain Range of Trinidad provide a classic example of phenotypic convergent evolution, where adaptation to low or high predation environ- ments has been found for a variety of traits. A major advantage of this system is the possibility of long-term experimental studies in nature, including transplantation from high to low predation sites. We used genome scans of guppies from three natural high and low predation populations and from two experimentally established populations and their sources to examine whether phenotypic convergent evolution leaves foot- prints at the genome level. We used population-genetic modelling approaches to recon- struct the demographic history and migration among sampled populations. Naturally colonized low predation populations had signatures of increased effective population size since colonization, while introduction populations had signatures of decreased effective population size. Only a small number of regions across the genome had sig- natures of selection in all natural populations. However, the two experimental popula- tions shared many genomic regions under apparent selection, more than expected by chance. This overlap coupled with a population decrease since introduction provides evidence for convergent selection occurring in the two introduced populations. The lack of genetic convergence in the natural populations suggests that convergent evolu- tion is lacking in these populations or that the effects of selection become difficult to detect after a long-time period.
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Publication status
- Published
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- Published version
Journal
Molecular EcologyISSN
0962-1083Publisher
Blackwell PublishingExternal DOI
Volume
24Page range
389-408Department affiliated with
- Evolution, Behaviour and Environment Publications
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- No
Peer reviewed?
- Yes
Legacy Posted Date
2016-04-08First Compliant Deposit (FCD) Date
2016-04-07Usage metrics
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