Question

Difficulty: HardIdentification of Main Idea and Supporting Details

Read the passage below carefully and answer the question that follows.

For decades, coastal mangrove estuaries were primarily valued for their physical storm-buffering capacity and nutrient-filtering capabilities. However, recent advances in passive acoustic monitoring have revealed that these intertidal forests function as critical acoustic sanctuaries vital to marine biodiversity. The dense root networks of mangroves do not merely attenuate wave energy; they significantly dampen anthropogenic noise pollution generated by coastal shipping and motorized vessels. Within these sheltered sonic micro-habitats, juvenile fish and larvae rely on natural biophony—such as the rhythmic snapping of alpheid shrimp and vocalizations of vocal teleosts—for navigational cues essential to settlement and survival. When industrial noise penetrates unbuffered waters, it disrupts acoustic communication, disorients larval navigation, and impairs predator-prey dynamics. Consequently, marine ecologists now advocate for integrating acoustic landscape conservation into coastal management frameworks. Protecting the sonic integrity of mangrove habitats is thus as imperative as maintaining their vegetative coverage, demonstrating that auditory preservation is fundamental to ecosystem resilience.

Which of the following statements best expresses the central idea of the passage?

  1. A
    The dense root systems of coastal mangroves primarily function to attenuate wave energy and filter nutrient runoff.
  2. Mangrove habitats serve as essential acoustic sanctuaries whose auditory preservation is crucial for marine ecosystem resilience.Answer
  3. C
    Motorized vessel transportation in coastal waters must be banned to protect alpheid shrimp biophony.
  4. D
    Anthropogenic noise pollution enhances the natural biophonic signals required by larval teleosts for navigation.

Answer

Mangrove habitats serve as essential acoustic sanctuaries whose auditory preservation is crucial for marine ecosystem resilience.
The passage centers on the newly discovered importance of mangroves as acoustic sanctuaries that protect marine biophony from industrial noise pollution. The author explicitly concludes that protecting sonic integrity is fundamental to overall ecosystem resilience, making the option stating that auditory preservation is crucial for ecosystem resilience the true main idea.

Step-by-Step Solution

1
Identify the primary topic and shift in focus within the passage.
The text transitions from traditional physical views of mangroves to their newly recognized role as acoustic sanctuaries protecting biophony from anthropogenic noise.
The main idea must incorporate the primary shift introduced by the contrastive transition 'However'.
2
Distinguish the overarching argument from supporting details.
Details about root networks, wave energy, and alpheid shrimp serve as supporting evidence for how mangroves protect acoustic signals, whereas the concluding sentence states the ultimate thesis: auditory preservation is fundamental to ecosystem resilience.
Supporting details explain mechanisms, while the main idea encapsulates the overarching conclusion of the text.
3
Evaluate options against the central conclusion.
The statement emphasizing auditory preservation as essential for marine ecosystem resilience reflects the comprehensive thesis of the passage.
The correct option must encompass both the main topic (acoustic sanctuary/preservation) and the author's primary thesis (essential for ecosystem resilience).

Key Concept

Identifying the central thesis of a passage by distinguishing main arguments from secondary supporting details and background context.
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