Figure 1.

The effects of diet composition, social grouping and challenge from the Metarhizium fungal parasite on ant worker survivorship. Ants are from colonies maintained on either a 1 protein (P) : 3 carbohydrate (C) ratio diet (red lines) or a 3P : 1C (blue lines) diet. Data in panel (a) are from 2011 and 2012. Data in panel (b) are from 2012 only. (a) Survivorship for Metarhizium-challenged ants when alone (solitary) or in 5-ant worker groups. (b) Survivorship for ants not facing Metarhizium challenge. Different lower-case letters indicate survival curve differences at p < 0.01 in pairwise comparisons using Kaplan–Meier survival tests.