Which mechanism accelerates lake eutrophication when agricultural runoff containing phosphorus enters?

💡 Explanation

When phosphorus-rich runoff enters a lake, it fuels excessive algal growth, known as a bloom, which blocks sunlight and decomposes, consuming oxygen. This causes increased thermal stratification, because the upper algal layer absorbs direct sunlight. Therefore stratification results rather than oxygen solubility decrease, bioerosion, or nitrogen fixation, which require different nutrient limitations and physical properties.

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