Table S1 Mean and standard deviation of snout-vent length for the males used for pheromone sampling.

Table S2 Number of tongue flicks directed at smell donors from different habitats (mainland, island) divided per sex and habitat of origin.

Table S3 Lipophilic compounds found in femoral gland secretions of male lizards P. gaigeae from distinct populations.

Table S4 Factor loadings of the different compounds on the ten first principal components from the principal component analysis on the compositon of the chemical compounds in the secretions from the femopores of male P. gaigeae.

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