Natural selection on a major armor gene in threespine stickleback - PubMed
- ️Tue Jan 01 2008
. 2008 Oct 10;322(5899):255-7.
doi: 10.1126/science.1159978. Epub 2008 Aug 28.
Affiliations
- PMID: 18755942
- DOI: 10.1126/science.1159978
Natural selection on a major armor gene in threespine stickleback
Rowan D H Barrett et al. Science. 2008.
Abstract
Experimental estimates of the effects of selection on genes determining adaptive traits add to our understanding of the mechanisms of evolution. We measured selection on genotypes of the Ectodysplasin locus, which underlie differences in lateral plates in threespine stickleback fish. A derived allele (low) causing reduced plate number has been fixed repeatedly after marine stickleback colonized freshwater from the sea, where the ancestral allele (complete) predominates. We transplanted marine sticklebacks carrying both alleles to freshwater ponds and tracked genotype frequencies over a generation. The low allele increased in frequency once lateral plates developed, most likely via a growth advantage. Opposing selection at the larval stage and changing dominance for fitness throughout life suggest either that the gene affects additional traits undergoing selection or that linked loci also are affecting fitness.
Comment in
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Evolution. Armor development and fitness.
Cresko WA. Cresko WA. Science. 2008 Oct 10;322(5899):204-6. doi: 10.1126/science.1165663. Science. 2008. PMID: 18845737 No abstract available.
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