Question

What are the consequences of increased nitrogen and phosphorus into water systems? (Site 3)

in a paragraph

Answer 1

Increased inputs of nitrogen and phosphorus into water bodies fuel excessive growth of algae and aquatic plants (eutrophication), which can produce harmful algal blooms that release toxins, reduce water clarity, and clog waterways; when these blooms die and decompose they consume dissolved oxygen, causing hypoxic or anoxic “dead zones” that kill fish and benthic organisms and reduce biodiversity and habitat quality. These changes disrupt food webs, favor tolerant or invasive species, increase treatment costs for drinking water, pose risks to human, livestock, and pet health, and harm fisheries and recreation-based economies; furthermore, nutrients can accumulate in sediments and groundwater, creating long-lasting legacy effects and even increasing greenhouse-gas emissions (e.g., N2O, methane) from aquatic systems.