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← GeographyWhich outcome affects cave ecosystems if excess agricultural fertilizer runs off into karst stream networks?
A)Accelerated calcite precipitation forms speleothems.
B)Oxygen depletion creates anoxic cave water.✓
C)Enhanced CO₂ absorption sequesters carbon.
D)Increased turbidity reduces algae production.
💡 Explanation
Eutrophication occurs from fertilizer runoff causing algae blooms, therefore microbial decomposition consumes excessive oxygen and creates anoxic conditions via the biological oxygen demand mechanism. This affects cave ecosystems rather than promoting speleothem growth because excess nutrients are the issue.
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