Phosphorus is an important nutrient, but too much of it in lakes and streams can diminish water quality and lead to eutrophication, resulting in harmful algal blooms and dead zones. To restore waterways degraded by excess phosphorus, decision-makers must understand which sources of the nutrient could be reduced to make the biggest impact on water quality.
, but the impact of agriculture is not uniform across different bodies of water.
A research team applied several statistical approaches to analyze data from the U.S. EPA's National Lakes Assessment and the National Rivers and Streams Assessment to determine the most influential drivers ofin the country's lakes and streams and better understand how these systems differ in their responses to changing inputs from various phosphorus sources.
The study, titled"Comparing Drivers of Spatial Variability in U.S. Lake and Stream Phosphorus Concentrations," was published in theThey found that phosphorus levels in streams were most strongly influenced by the amounts of fertilizer and manure introduced to nearby farmland, as well as by legacy sources of agricultural phosphorus released by erosion.
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