In evolutionary acoustics, "cascade signal displacement" refers to an adaptive sequence triggered when sympatric animal species compete for limited bandwidth within a shared acoustic environment. When an invasive insect species begins emitting continuous, low-frequency mating calls throughout a canopy, a native songbird species initially responds by shifting its vocalizations to higher frequency bands to avoid signal overlap. Although this frequency elevation successfully restores acoustic clarity among nearby nestmates, high-frequency sound waves undergo significantly greater atmospheric attenuation and structural absorption by dense foliage over longer distances.
To compensate for the resulting reduction in spatial range, the songbirds must dramatically increase their vocal amplitude. However, this elevated volume creates an unintended vulnerability by rendering the songbirds far more conspicuous to acoustic predators operating within the same canopy. To mitigate this heightened predation risk without completely abandoning reproductive signaling, the songbirds eventually alter their behavioral repertoire by restricting their calls to extremely brief, unpredictable bursts during early twilight hours when predator hunting activity temporarily wanes.
What begins as a targeted physiological adjustment to preserve signal fidelity thus cascades into a comprehensive restructuring of the species' temporal activity budget and anti-predator behavior. Researchers emphasize that the key driver of this final state is not the initial acoustic interference itself, but rather the cumulative trade-offs incurred at each successive stage of behavioral compensation.
Which of the following scenarios is most analogous to the process of "cascade signal displacement" described in the passage?
- A software firm switches its mobile application's wireless protocol to a higher frequency band to avoid network interference from competing applications; because higher frequencies have shorter operational range, the firm boosts transmitter power, which unintentionally exposes user location data to third-party hackers, leading the firm to restrict data transmissions to brief, randomized bursts during off-peak hours.Cevap
- BA wildlife sanctuary installs acoustic insulation barriers along a boundary highway to suppress vehicle noise pollution, enabling native birds to hear each other's low-frequency calls clearly without modifying their vocal habits or increasing their exposure to natural predators.
- CA marine navigation vessel increases its sonar transmission power to overcome engine noise from neighboring ships, which expands its detection radius while simultaneously lowering its sonar frequency to attract predatory fish toward commercial nets during daytime operations.
- DA telecommunications provider upgrades its wireless network to high-frequency spectrum bands to eliminate cross-channel signal overlap, successfully resolving all bandwidth congestion without experiencing signal attenuation or introducing security vulnerabilities.
- EA commercial airline reroutes its flight paths around localized atmospheric turbulence, causing minor flight delays that prompt passengers to file administrative complaints with aviation oversight agencies.