Responses of high-mountain plant species to global change are highly influenced by the genetic background of the species, including genetic diversity or gene flow between populations. García-Fernández et al. study the genetic patterns of Silene ciliata (Caryophyllaceae), a high-mountain cushion plant that shows local adaptation to altitude, by examining populations along two altitudinal gradients on separate mountains in central Spain. They find that genetic diversity is similar in all populations, and although substantial gene flow is found both along altitudinal gradients and horizontally within each elevation belt, greater values are obtained along altitudinal gradients.
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