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Invasion of diverse habitats by few Japanese knotweed genotypes is correlated with epigenetic differentiation
Ist Teil von
Ecology letters, 2012-09, Vol.15 (9), p.1016-1025
Ort / Verlag
Oxford: Blackwell Publishing Ltd
Erscheinungsjahr
2012
Link zum Volltext
Quelle
Wiley Online Library Journals Frontfile Complete
Beschreibungen/Notizen
The expansion of invasive species challenges our understanding of the process of adaptation. Given that the invasion process often entails population bottlenecks, it is surprising that many invasives appear to thrive even with low levels of sequence‐based genetic variation. Using Amplified Fragment Length Polymorphism (AFLP) and methylation sensitive‐AFLP (MS‐AFLP) markers, we tested the hypothesis that differentiation of invasive Japanese knotweed in response to new habitats is more correlated with epigenetic variation than DNA sequence variation. We found that the relatively little genetic variation present was differentiated among species, with less differentiation among sites within species. In contrast, we found a great deal of epigenetic differentiation among sites within each species and evidence that some epigenetic loci may respond to local microhabitat conditions. Our findings indicate that epigenetic effects could contribute to phenotypic variation in genetically depauperate invasive populations. Deciphering whether differences in methylation patterns are the cause or effect of habitat differentiation will require manipulative studies.