Answer :
Final answer:
Excess phosphorus from fertilizers stimulates algal growth leading to algal blooms and oxygen depletion in water ecosystems.
Explanation:
Phosphorus from lawn fertilizers runoff into lakes, leading to an excess that stimulates algal growth in a process known as eutrophication. This excess phosphorus fuels the rapid proliferation of algae, resulting in algal blooms, which can have detrimental effects on water ecosystems.
As a result of the algal blooms, light penetration in the water is reduced, leading to oxygen depletion when the algae die and decompose. This oxygen depletion can cause fish die-offs and create dead zones in the water, impacting the overall health of the aquatic ecosystem.
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