Proportion of attacks performed and received for the first time A and mortality B of Linepithema humile workers collected in Galiza in September towards workers from other nests collected in the same season, workers from the same nest and season (Control), and workers from the same nest but different season (spring). Note that when measuring mortality, nest ID could not be identified and therefore, corpses could belong to any of the two paired colonies. Workers from CG collected in March died before tests performed in autumn. Trabanca: TR; Carril Garden: CG; Carril Coast: CC; Ribeira: RI; Pontevedra: PO; Reboreda: RE.