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EARLY TREATMENT — METABOLIC SUPPRESSION (T+0 to ~30 minutes)

his is the moment where I heard my hive enter treatment suppression. The tone felt quiet, deliberate, and low‑energy, but not distressed. My spectrograms showed the hive reducing its metabolic output immediately after pad placement — a calm, uniform quieting rather than collapse.

Spectrogram Slice

These slices capture the hive’s first response to treatment. I use them as the starting point, and the later slices show how the hive gradually adjusts and recovers.

Early Treatment - T + 0 minutes (pads just in)

9.12.png

Early Treatment - T + 28 minutes 

9.40.png

Acoustic Description

Fundamental (100–130 Hz)

The fundamental softened immediately after pad placement. It sat around 112–114 Hz, with a slight fluctuation at first that settled by 09:40. This quiet, low‑energy hum is typical of treatment suppression, not collapse.

Sag Zone (160–200 Hz)

A shallow, stable sag appeared around 176–184 Hz. It didn’t deepen or widen, which tells me the hive reduced activity deliberately rather than losing metabolic control.

Midband (260–300 Hz)

The midband was thin but organised. At 09:12 it was barely visible, and by 09:40 it began to re‑form in the 272–284 Hz range. This faint midband is one of the clearest indicators of early suppression.

The hive quietened uniformly across all bands. No collapse void, no hollow tone, no agitation flicker — just a calm, organised suppression.

Upper Midband (300–360 Hz)

Only a soft trace was present. It wasn’t broken or chaotic — just quiet. This is exactly what I expect when the hive is lowering metabolic output.

Harmonics (360–450 Hz)

Harmonics showed only a light flicker with no ladder structure. This is normal for the first minutes of treatment, when movement and metabolic drive temporarily reduce.

Overall Tone

The hive quietened uniformly across all bands. No collapse void, no hollow tone, no agitation flicker — just a calm, organised suppression.

Biological Interpretation

This phase represents the hive entering deliberate metabolic suppression. They quietened immediately after pad insertion, reducing energy output across all bands. I didn’t hear any collapse signatures — just a calm, controlled quieting.

Physiologically, this means:

  • heater bees reduced metabolic drive

  • brood temperature regulation shifted into low‑energy mode

  • movement inside the hive slowed

  • ventilation teams paused rather than stressed

  • the colony was adjusting, not panicking

This is a healthy early‑treatment response.

5. Diagnostic Value

Healthy Indicators

  • No collapse void

  • No hollow tone

  • Sag shallow and stable

  • Midband faint but organised

  • Upper midband present (even if soft)

  • Harmonics flickering normally for treatment shock

Watch Points (not present here)

  • deep sag

  • hollow midband

  • broken fundamental

  • chaotic harmonics

  • agitation flicker

  • collapse void

My early‑treatment slices showed none of these — they were metabolic suppression.

6. Context Notes

  • Pads placed immediately before recording

  • Entrance behaviour calm

  • No agitation or trembling

  • Weather stable

  • Colony adjusting quietly

  • No abnormal debris at this stage

  • These notes match the acoustic suppression I heard.

7. Cross‑References

Related phases:

  • Mid Treatment (adjusted suppression)

  • Late Treatment (first recovery signals)

  • Early Recovery (metabolic return)

Related sections:

  • Varroa Detection Overview

  • Behaviour Signatures

  • Tone Families (especially Smooth / Steady‑Work baseline for comparison)

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