What primary ecological consequence occurs in an aquatic lake ecosystem following massive agricultural fertilizer runoff containing excess nitrates and phosphates?
Answer and explanation
Correct answer: C. Algal blooms leading to oxygen depletion upon decomposition
- Step 1: Nutrient enrichment (eutrophication) triggers rapid overgrowth of algae (algal bloom). Step 2. When algae die, aerobic decomposers consume vast amounts of dissolved oxygen, creating hypoxic dead zones. Answer: Algal blooms leading to oxygen depletion upon decomposition. Why not the others: Oxygen is depleted, not increased; water clarity drops drastically, harming fish populations.
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