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Mean (+s.e.) (a) intraspecific aggression and (b) per capita colony-level activity for Argentine ant colonies reared on diets with different levels of sucrose and insect prey. For each performance measure, the effect of sucrose was significant, but the effect of prey was not. Different lower-case letters indicate significantly different sucrose levels from Tukey tests. White bars, zero prey; grey bars, low prey; black bars, high prey.
