The correct option for restoring a degraded ecosystem is
B. Implementing controlled burns to manage invasive plant species.
Detailed Explanation
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Understanding Ecosystem Degradation: Ecosystems can become degraded due to various factors, including human activities (like deforestation, pollution, and urbanization), invasive species, and climate change. Restoration aims to return the ecosystem to a healthy, functioning state.
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Option A: Introducing non-native species to increase biodiversity:
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Why it's incorrect: Introducing non-native species can often lead to more harm than good. Non-native species can become invasive, outcompeting native species for resources, disrupting local ecosystems, and leading to a loss of biodiversity. The goal of restoration is to support native species and their habitats, not to introduce potential threats.
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Option B: Implementing controlled burns to manage invasive plant species:
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Why it's correct: Controlled burns, or prescribed fires, are a management tool used to reduce the biomass of invasive plant species that can dominate and alter ecosystems. Fire can help to clear out invasive species, promote the growth of native plants that are adapted to fire, and restore nutrient cycling in the soil. This practice has been shown to be effective in many ecosystems, particularly in grasslands and forests where fire is a natural part of the ecosystem dynamics.
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Option C: Reducing the size of protected areas to allow for more human development:
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Why it's incorrect: Reducing protected areas typically leads to increased habitat loss and fragmentation, which can further degrade ecosystems. Protected areas are crucial for conserving biodiversity and providing habitats for various species. Allowing more human development in these areas can lead to overexploitation of resources and increased pollution, which are detrimental to ecosystem health.
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Option D: Increasing pesticide use to eliminate pests:
- Why it's incorrect: While pesticides can control certain pest populations, their use can have significant negative impacts on non-target species, including beneficial insects, birds, and aquatic life. Pesticides can also lead to soil and water contamination, further degrading the ecosystem. A more sustainable approach focuses on integrated pest management, which includes biological control methods and habitat management rather than relying solely on chemical solutions.
Summary of Key Points
- Controlled burns are an effective method for managing invasive species and restoring ecosystems.
- Non-native species can disrupt local ecosystems and reduce biodiversity.
- Reducing protected areas leads to habitat loss and further degradation.
- Increased pesticide use can harm beneficial species and contaminate the environment.
Revision Summary
- Controlled burns help manage invasive species and promote native biodiversity.
- Introducing non-native species can harm ecosystems rather than help them.
- Protecting natural areas is essential for ecosystem health and biodiversity.
- Sustainable pest management is preferable to increased pesticide use for ecosystem restoration.