Stress/Alert tone
Overview
Stress / Alert tones appear when the colony experiences sustained pressure or perceives a meaningful threat. These tones are sharper, more energetic, and more structured than Disturbance tones, reflecting a hive that has moved beyond simple reaction into active defensive or stress‑driven behaviour.
Tone Characteristics
-
Raised or sharpened fundamental — clear elevation in base tone due to heightened wing‑beat tension.
-
Energetic midband — strong modulation, flickers, or surges that persist rather than settle.
-
Pronounced harmonics — 2× and 3× multiples become sharper, brighter, and more forceful.
-
Defensive posture — bees orient outward, cluster tightly, and increase movement intensity.
What This Tone Indicates
Stress / Alert reflects a colony that is actively responding to a sustained trigger. This may include predator pressure, prolonged disturbance, hive opening, queen disruption, or environmental stress. It is a tone that signals the hive is no longer assessing — it is preparing to act.
Acoustic Snapshot
A Stress / Alert recording feels sharp, bright, and energetic. The midband shows persistent modulation, and harmonics may flare or surge repeatedly. It is recognisably stronger and more sustained than Disturbance / Reactive, and it does not settle quickly.
Behavioural Notes
-
Bees move rapidly and orient toward the disturbance.
-
Guard activity increases significantly.
-
Wing‑beat tension rises across the cluster.
-
Tone may escalate further if the stressor continues.
Compare With
-
Disturbance / Reactive — short‑lived flicker; Stress / Alert is sustained.
-
Smooth Calm — warm, even, and unpressured.
-
Steady‑Work — rhythmic and organised, not sharp or defensive.
Stress / Alert Example slice
Fundamental: raised, sharpened
Midband: sustained energetic modulation Harmonics: pronounced surges (2×, 3×)
UMB: heightened defensive activity