Morphology, ultrastructure and function of the sternal gland in two mason bee species (Osmia bicornis and O. cornuta)
Fig 5
Attractiveness of newly emerged O. bicornis males untreated, treated with sternal gland extracts or solvents, expressed as proportion of physical contacts per approach.
Box plots indicate 5, 25, 50, 75, and 95 percentiles, outlying data points appear as diamonds, circles refer to the mean, numbers specify the number of trials; cor = O. cornuta.