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Difficulty: HardCommand of Evidence: Textual

In a study of avian behavioral plasticity, zoologist Dr. Kenji Tanaka and his team analyzed the vocal patterns of *Zosterops japonicus* (Japanese white-eye) populations across various environments. Tanaka hypothesized that while urban noise pollution typically pressures birds to raise the minimum frequency of their songs to prevent acoustic masking by low-frequency city sounds, this adaptation is significantly constrained by local foliage density, which scatters higher-frequency sounds. Consequently, Tanaka claimed that in urban habitats characterized by high foliage density, *Zosterops japonicus* will maintain lower minimum song frequencies compared to their counterparts in more open, sparse urban areas. Which finding, if true, would most directly support Tanaka's claim?

  1. A
    In urban areas with high foliage density, *Zosterops japonicus* sing at higher minimum frequencies than they do in urban areas with low foliage density.
  2. In urban parks with dense tree canopies, *Zosterops japonicus* populations sing at minimum frequencies similar to those of rural populations, whereas in concrete plazas with minimal vegetation, they sing at much higher minimum frequencies.Answer
  3. C
    Urban noise pollution is significantly louder in concrete plazas with minimal vegetation than in urban parks with dense tree canopies, driving the difference in song minimum frequencies.
  4. D
    *Zosterops japonicus* populations in rural areas with high foliage density produce songs with a wider overall frequency range than populations in rural areas with low foliage density.

Answer

The finding that urban white-eyes in dense parks sing at lower minimum frequencies (matching rural populations) than those in concrete plazas supports the claim that dense foliage constrains frequency elevation.
The correct answer provides direct support for the claim by showing that in urban settings with high foliage density (dense tree canopies), the birds sing at lower minimum frequencies (similar to rural baselines), whereas in urban settings with low foliage density (concrete plazas), they sing at higher minimum frequencies.

Step-by-Step Solution

1
Identify the central claim made by the researcher in the passage.
The researcher claims that in urban environments with high foliage density, the birds will maintain lower minimum song frequencies compared to those in open, sparse urban environments.
Understanding the specific hypothesis is necessary to evaluate which finding supports it.
2
Evaluate the options to find one that demonstrates lower minimum frequencies in dense urban foliage compared to sparse urban foliage.
The finding that birds in dense urban parks sing at lower minimum frequencies compared to those in concrete plazas (which have minimal vegetation) directly validates the claim.
This finding provides empirical evidence directly matching the predicted effect of foliage density on song frequency.

Key Concept

Identifying textual evidence that supports a specific scientific claim.
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Topics

Command of Evidence: Textual

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