Fig S1. The caste ratio (proportion of workers to gynes) in the first and late female offspring of the four populations.

Table S1. The results of analyses of univariate general linear models across populations and years on one morphological trait (head width) and three life-history traits (building effort, brood investment, and protection effort) that characterize foundress reproductive decisions.

Table S2. Product-moment correlations between all pairwise combinations of building effort, head width, brood investment, and protection effort (transformed variables) in the four populations.

Table S3. Selection by predators, usurpers, and parasites on host phenotypic traits.

Table S4. Selection on parasites by host foundresses.

Table S5. Selection on parasites.

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