Which mechanism initiates the eutrophication process in freshwater lakes experiencing agricultural runoff?

💡 Explanation

When agricultural runoff enters lakes, nutrient loading frequently occurs because fertilizers contain high concentrations of nitrogen and phosphorus that overwhelm the lake's natural nutrient cycles, leading to rapid algal growth. Therefore nutrient loading exceeding consumption triggers eutrophication, rather than increased UV, thermal stratification, or predator removal each reliant on different conditions and systems.

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