Soru

Passage:
In the emerging discipline of soundscape ecology, Bernie Krause proposed the Acoustic Niche Hypothesis (ANH), positing that vocalizing organisms in mature, undisturbed biomes partition the acoustic spectrum by pitch, frequency band, and temporal window to minimize acoustic interference. Whereas traditional bioacoustics historically examined the calls of individual species in isolation—often treating ambient acoustic competition as background noise—the ANH posits that entire biophonies function as interconnected, highly structured systems. To substantiate this premise, soundscape researchers point to recordings from undisturbed Bornean rainforest canopies, where cicadas, anurans, and hornbills consistently broadcast in distinct, non-overlapping acoustic strata throughout the dawn chorus. Skeptics maintain that such spectral segregation could merely be an incidental consequence of physiological differences—specifically, that disparate body sizes dictate resonant vocal frequencies—rather than evidence of active ecological co-adaptation. Nonetheless, recent field trials demonstrating that certain avian species actively adjust their pitch when competitor bands are occupied suggest that acoustic partitioning is a dynamic, coordinated phenomenon.

The author's reference to the "undisturbed Bornean rainforest canopies" serves primarily to do which of the following?