Which mechanism accelerates lake eutrophication when agricultural runoff contains excessive nutrients?

💡 Explanation

When agricultural runoff containing excessive nutrients enters a lake, algal blooms occur because the nutrients stimulate rapid algae growth, the decomposition of which consumes oxygen, depleting it and harming the aquatic ecosystem. Therefore, algal bloom induced oxygen depletion results, rather than sedimentation, thermal stratification, or decreased clarity which exert different effects on the lake ecosystem.

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