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Zorluk: ZorEvaluating Supporting Evidence

Read the following passage:

For decades, bioacousticians assumed that animal vocalizations in a forest occurred independently, forming a chaotic wall of sound. However, ecological soundscape pioneer Bernie Krause proposed the Acoustic Niche Hypothesis (ANH), which posits that organisms in healthy ecosystems partition the acoustic spectrum—both in frequency and time—to avoid auditory masking and ensure their signals are heard. According to Krause, this vocal coordination operates similarly to instruments in a well-orchestrated symphony, where each species occupies its own acoustic bandwidth. To test this, researchers monitored an undisturbed rainforest in Gabon, recording continuous audio over a year. Spectrographic analysis revealed that during the dawn chorus, the calls of specific insect species, such as cicadas, shifted their pitch upward when bird species occupying adjacent frequency bands began singing. Conversely, in nearby regions degraded by logging, no such pitch adjustments were observed; instead, avian and insect signals overlapped extensively, resulting in high acoustic interference. While critics argue that these spectral shifts are merely immediate, localized responses to noise rather than evolved cooperative behaviors, the stark difference between the structured soundscape of the pristine forest and the chaotic overlap in the degraded area provides compelling evidence for Krause’s assertion.

According to the passage, which of the following findings from the Gabon rainforest study provides the most direct supporting evidence for Bernie Krause's Acoustic Niche Hypothesis?

  1. A
    Bernie Krause asserted that animal vocalizations partition the acoustic spectrum in frequency and time to ensure their signals are heard.
  2. B
    Insect species in the degraded regions of the forest permanently altered their vocal pitch to avoid overlapping with bird songs.
  3. During the dawn chorus in the undisturbed forest, specific insect species shifted their vocal pitch upward as birds in neighboring frequency bands began singing.Cevap
  4. D
    Researchers recorded continuous audio in Gabon over a year to track how seasonal migration patterns affected forest noise.

Cevap

The finding that specific insect species shifted their vocal pitch upward during the dawn chorus when birds in adjacent frequency bands began singing in the undisturbed forest.
The correct answer is supported by the passage, which explains that spectrographic analysis in the undisturbed forest showed insects shifting their pitch upward when birds in neighboring frequency bands began singing. This observed behavior directly demonstrates the active partitioning of the acoustic spectrum to avoid auditory masking, supporting Krause's hypothesis.

Adım Adım Çözüm

1
Identify the primary claim to be evaluated.
Bernie Krause's Acoustic Niche Hypothesis states that organisms in healthy ecosystems partition the acoustic spectrum in frequency and time to avoid masking each other's calls.
Before evaluating the supporting evidence, you must identify the exact hypothesis or thesis being tested.
2
Locate the evidence from the Gabon study mentioned in the text.
The researchers found that in the undisturbed forest, insects shifted their pitch upward when birds in adjacent bands sang, whereas in degraded forests they did not coordinate and overlapped.
This empirical finding directly connects to the idea of active, coordinated frequency partitioning.
3
Match the finding to the options, ensuring no logical distortion is introduced.
The option stating that specific insect species shifted their pitch upward in the undisturbed forest as birds in neighboring bands began singing matches the study's finding without distortion.
This confirms that the chosen option is both factually accurate according to the passage and directly supports the targeted hypothesis.

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Evaluating Supporting Evidence
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Evaluating Supporting Evidence

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