Molecular genetic analyses show that introduced populations undergoing biological invasions often bring together individuals from genetically disparate native-range source populations, which can elevate genotypic variation if these individuals interbreed. Differential admixture among multiple native-range sources explains mitochondrial haplotypic diversity within and differentiation among invasive populations of the lizard Anolis sagrei. Our examination of microsatellite variation supports the hypothesis that lizards from disparate native-range sources, identified using mtDNA haplotypes, form genetically admixed introduced populations. Furthermore, within-population genotypic diversity increases with the number of sources and among-population genotypic differentiation reflects disparity in their native-range sources. If adaptive genetic variation is similarly restructured, then the ability of invasive species to adapt to new conditions may be enhanced.
Kolbe, Jason JLarson, AllanLosos, Jonathan Bde Queiroz, KevinengResearch Support, U.S. Gov't, Non-P.H.S.England2008/05/22 09:00Biol Lett. 2008 Aug 23;4(4):434-7. doi: 10.1098/rsbl.2008.0205.