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Karen E. Samis, Courtney J. Murren, Oliver Bossdorf, Kathleen Donohue, Charles B. Fenster, Russell L. Malmberg, Michael D. Purugganan and John R. Stinchcombe Longitudinal trends in climate drive flowering time clines in North American Arabidopsis thaliana Ecology and Evolution 2

Version of Record online: 3 MAY 2012 | DOI: 10.1002/ece3.262

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We find strong evidence for substantial within population genetic variation in quantitative traits and flowering time, and putatively adaptive longitudinal differentiation, despite low levels of variation at FRI, FLC, and PHYC and genome-wide reductions in population structure relative to Eurasian samples. The observed longitudinal cline in flowering time in North America is parallel to a Eurasian cline, robust to the effects of population structure, and associated with geographic variation in winter precipitation and temperature.

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