Honey Bee Inhibitory Signaling Is Tuned to Threat Severity and Can Act as a Colony Alarm Signal
(A) Large hornets elicited stop signals with a consistently higher fundamental frequency. The spectrogram shows a typical stop signal produced by a forager attacked by the large hornet. (B) Nest attacks elicited signals with a consistently longer pulse duration. The oscillogram shows a typical stop signal produced by a worker attacked by the hornet at the nest entrance. Graphs show the mean ± 1 standard error. Different letters indicate significant differences (Tukey’s HSD test, p < 0.05).