Middle School Life Science Quiz
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ECOSYSTEMS: INTERACTIONS, ENERGY, AND DYNAMICS
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A grassland park is losing native wildflowers that support pollinators. Managers are evaluating conservation solutions using multiple criteria (effects on organisms, cost, and visitor use).
Evidence:
- Solution 1: Remove invasive grasses by hand in 50 acres. Scientific: native wildflower cover increased from 15% to 28% in 2 years; pollinator visits increased 18%. Economic/social: $60,000/year labor; requires closing 3 trails for 4 weeks each spring.
- Solution 2: Spray a selective herbicide in 200 acres. Scientific: invasive grass cover decreased 50%; native wildflower cover increased to 22%; some native seedlings reduced in first month. Economic/social: $25,000/year; visitors report concerns about spraying; no trail closures.
- Solution 3: Add more beehives. Scientific: honeybee numbers increase, but native pollinator diversity decreased 10% at similar sites due to competition; wildflower cover unchanged. Economic/social: $10,000/year; popular with visitors.
What evidence supports the evaluation that Solution 2 may be effective but has tradeoffs compared with Solution 1?
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