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Here we analyze levels and patterns of nucleotide diversity, selection and demographic history, using 37 individuals of ) were selected for their location across the O-chromosome and their implication in thermal adaptation.

(Krimbas and Powell, 1992; Krimbas, 1993) has had an important role in demonstrating the adaptive role of inversions, as shown by the coinciding latitudinal clines on inversion frequencies found in Palearctic and also in colonizing populations (Krimbas and Loukas, 1980; Prevosti .

Despite the evidence for an adaptive role of inversions, the genetic and mechanistic basis underlying their role in adaptation remains unknown.

Several hypotheses have been suggested to explain the maintenance of inversion polymorphism in populations (reviewed in Hoffmann and Rieseberg, 2008).

The six analyzed genes (Pif1A, Abi, Sqd, Yrt, AtpĪ± and Fmr1) were selected for their location across the O-chromosome and their implication in thermal adaptation.