Fig. 1From: Comparative morphology of the postpharyngeal gland in the Philanthinae (Hymenoptera, Crabronidae) and the evolution of an antimicrobial brood protection mechanismMajor hydrocarbons of P. gibbosus on provisioned and control bees. Mean arcsine-transformed proportion (+ standard deviation, SD) of heptacosene + heptacosadiene (unsaturated C27), nonacosene (unsaturated C29), and hentriacontene + hentriacontadiene (unsaturated C31) in extracts of provisioned bees taken from P. gibbosus brood cells (white bars, N = 6) and control bees which had no contact to the beewolves (grey bars, N = 9); closed circles show individual data points (open circles indicate outliers). Asterisks indicate a significance level of p ≤ 0.001 according to t tests (including outliers)Back to article page