Forest birds favor pure tones around 2,200 Hz where attenuation is lowest

Evidence

This author after playback experiments has confirmed that forest habitats differ from edge, and open areas in a narrow range of frequency (1,585–2,500 Hz) have a lower attenuation than lower or higher frequencies. The attenuation increases sharply above 2,500 Hz. Birds that inhabit the lower forest level have predominantly pure tones averaging 2,200 Hz. — Almo Farina, Soundscape Ecology, 422

Categorization

• SHARE: Specific numeric window (1,585–2,500 Hz least attenuated in forest; sharp loss above 2,500) would interest someone working in bioacoustic signal design.
• XREF: connects to: Animal long-distance calls evolve to match habitat acoustics — Almo Farina, Soundscape Ecology: Principles,…, 409; Body size constrains the frequencies animals can vocalize — Almo Farina, Soundscape Ecology: Principles,…, 385; High-pitched bird species tolerate roadside noise better than low-pitched ones — Almo Farina, Soundscape Ecology: Principles,…, 1383 (+2 more)

Broader Connections

• Pure-tone notes exploit reverberation to travel farther in dense forest #qualifies (0.75) — Almo Farina, Soundscape Ecology, 432
• High-pitched bird species tolerate roadside noise better than low-pitched ones #qualifies (0.72) — Almo Farina, Soundscape Ecology, 1383
• Excess attenuation increases with frequency in vegetated habitats #qualifies (0.70) — Almo Farina, Soundscape Ecology, 418