Read the following passage carefully.
In the burgeoning field of acoustic ecology, Bernie Krause’s Niche Hypothesis posits that in mature, undisturbed ecosystems, various vocalizing animal species evolve to occupy distinct acoustic bandwidths—specific frequency ranges and temporal patterns—to ensure their mating calls and territorial vocalizations are not masked by the ambient biophony (the collective sound produced by all living organisms in a given habitat). Krause observed that when the audio spectra of pristine tropical rainforests are mapped graphically, the resulting spectrograms reveal highly structured partitioning; amphibians, birds, and insects occupy tightly stratified acoustic spaces, much like radio stations broadcasting on carefully regulated frequencies.
Conversely, in habitats subjected to significant anthropogenic disturbance, such as selective logging or encroaching infrastructure, this acoustic partitioning breaks down. Even when the physical canopy appears relatively intact, the introduction of anthrophony—human-generated noise, primarily low-frequency mechanical sounds—forces species to alter their vocalization parameters. Some avian species attempt to shift their calls to higher frequencies to avoid masking by low-frequency engine rumble. However, because morphological constraints tightly govern the vocal apparatus of many species, such frequency shifts are often sharply limited. A bird forced to vocalize outside its evolved acoustic niche may suffer a precipitous decline in communicative efficacy, leading to disrupted mating patterns and, ultimately, population decline.
Crucially, the Niche Hypothesis suggests that acoustic structure serves as an early indicator of ecosystem health, preceding observable structural degradation. Traditional ecological assessments often rely on visual surveys of species richness, which can mistakenly classify a recently disturbed habitat as robust if the resident individuals have not yet died out or migrated. In contrast, acoustic monitoring can detect the immediate unraveling of the biophonic network. When the structural integrity of the acoustic niche partitioning degrades, it indicates that the resident species are either expending unsustainable metabolic energy attempting to be heard over novel noise pollution or are failing to communicate altogether, portending an inevitable collapse in biodiversity even if the current visual census appears stable.
Evaluate the following statement based on the inferences logically supported by the passage:
The inability of certain avian species to successfully shift their vocalizations to higher frequencies in response to low-frequency engine rumble is a direct result of their expending unsustainable amounts of metabolic energy.
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