Figure 2.

(a) Net average attackers-to-observers differential as a function of log₁₀ colony size (CS). Of the three species, only the intermediate social–subsocial A. jabaquara has a significant correlation: A. baeza differential = 0.38 × CS + 0.81, r² = 0.06, p = 0.67; A. jabaquara differential = −2.88 × CS + 2.37, r² = 0.27, p ≤ 0.01; A. dubiosus differential = −0.80 × CS + 1.17, r² = 0.02, p = 0.20. Each point represents one colony's response, averaged across all three prey sizes. Dashed line indicates an equal differential of attackers to observers. (b) Log₁₀[total number of attackers + 1] for each species as a function of log₁₀ colony size for the three prey sizes. There was no significant interaction between prey size and colony size for A. baeza (F_2,42 = 0.52, p = 0.60), but there was for A. jabaquara (F_2,81 = 4.74, p = 0.01) and A. dubiosus (F_2,90 = 3.50, p = 0.03).