Mechanisms of Odor Coding in Coniferous Bark Beetles: From Neuron to Behavior and Application

Figure 3

Number of olfactory receptor neurons (ORNs) of 17 strongly responding classes of Ips typographus (data from [19]). ORN classes are labeled according to which compound(s) elicited the strongest response. As pure enantiomers were not tested, it is likely that the ipdienol ORN classes A and B correspond to the ORNs responding to (+)- and (−)-ipdienol, respectively [29]. Orange = bark beetle pheromone compounds, brown = conifer compounds, green = nonhost volatiles. GLV-OHs = green leaf volatile alcohols.