Middle School Life Science Quiz
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ECOSYSTEMS: INTERACTIONS, ENERGY, AND DYNAMICS
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A lake has an invasive plant that forms dense mats, lowering native plant diversity and reducing habitat for fish. Two solutions are proposed.
Solution 1: Mechanical removal (harvesting) of the invasive plant each summer. How it works: physically removes mats to open space for native plants.
Constraints/tradeoffs: can disturb fish nests; must be repeated yearly.
Evidence: after removal in a test bay, native plant species increased from 4 to 7, but fish nest disturbance was observed during removal.
Solution 2: Introduce an insect that eats the invasive plant (biological control). How it works: insect reduces invasive plant growth over multiple years.
Constraints/tradeoffs: risk the insect also eats some native plants; takes time to spread.
Evidence: in a similar lake, invasive plant cover dropped 60% after 3 years, but one native plant species decreased by 15%.
What evidence supports the comparison of Solution 1 and Solution 2 for maintaining biodiversity?
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