Sunken-Bell Frog Chorus
They cling to submerged buildings. At high tide, thousands inflate translucent bronze, bell-shaped throat sacs in synchrony to signal water pressure. Their pressure-sensitive lateral lines and synchronized pulses create visible ripples, while the resonance can loosen corroded metal.
Observation LevelCoastal field note
First SeenDay 03 · Day 03 · Sunken Transit Tube
HabitatThe submerged former coastline southwest of the Vancouver dome
VariantsFaintly glowing tadpoles inside flooded pipes and palm-sized adult colonies
Habitat and Mechanism
The submerged former coastline southwest of the Vancouver dome。Warm, humid dome exhaust, seawater intrusion, pressure release from old tide gates, and submerged metal structures combine to form a low-frequency resonant wetland.
Enter Tidal Echo Wetland ↗Behavior and Ecological Role
They cling to submerged buildings. At high tide, thousands inflate translucent bronze, bell-shaped throat sacs in synchrony to signal water pressure. Their pressure-sensitive lateral lines and synchronized pulses create visible ripples, while the resonance can loosen corroded metal.
Their chorus showed that the abnormal echo was a large biological signal amplified by the wetland, not an equipment fault.
Form and Identification
Faintly glowing tadpoles inside flooded pipes and palm-sized adult colonies
- Palm-sized amphibians gathered on submerged concrete and rusted transit tubes
- Translucent bronze, bell-shaped throat sacs
- Pressure-sensitive lateral lines
- Synchronized pulses that produce visible ripples
- Faintly glowing tadpoles inside flooded pipes
Observation Rule
Fang and K sample the rhythm without disturbing the colony. They treat the frogs as a source of ecological evidence and wait above the waterline when the chorus signals the incoming tide.
Fang extended a sensor to read the rhythm. K held the safety line and warned her about the rusted pipe's resonance.