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Table S1 List of the identified cuticular hydrocarbons of workers from Caldès d’Estrac (Catalonian supercolony), Ceyreste (Main supercolony) and Fréjus (Corsican supercolony).

Table S2 Proportions of shared alleles between the three European supercolonies of Linepithema humile (left part) and FST values (right part).

Fig. S1 Results of the analysis performed with the software STRUCTURE including all the nesting sites (A and B), and the analysis where the Catalonian nesting sites (CDE) was excluded (C and D).

Fig. S2 Assignment of individuals into genetic groups resulting from the analyses performed with the software STRUCTURE when individuals of all nesting sites were included and when = 2 (panel A), when individuals of all nesting sites were included except those of the Catalonian nesting site (CDE) and when = 4 (panel B) and when individuals of all nesting sites were included except those of the Catalonian nesting site (CDE) and when = 4 (panel C).

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