GLIN==> Fwd: USGS releases national- and regional-scale assessments on nutrient changes in streams from 1993 to 2003

-------- Original Message --------
Subject: 	USGS releases national- and regional-scale assessments on 
nutrient changes in streams from 1993 to 2003
Date: 	Wed, 15 Jul 2009 14:59:07 -0400
From: 	Pixie A Hamilton <pahamilt at usgs.gov>


*Nutrient Concentrations Remained Stable in Many Streams from 1993 to 2003*
The U.S. Geological Survey National Water-Quality Assessment program 
conducted _national- and regional-scale trend assessments (1993 to 2003) 
of nutrient concentrations and loads in streams_ 
<http://water.usgs.gov/nawqa/pubs/nutrient_trends/> and how these trends 
corresponded to changes in streamflow and nutrient sources, such as 
fertilizer applications, animal manure, population, and atmospheric 
deposition. Phosphorus and nitrogen concentrations remained relatively 
stable in about half of the streams assessed nationwide from 1993 to 
2003; however, the pattern did vary in some regions, including increases 
in phosphorus concentrations in more than half of the streams assessed 
in the Mississippi/Atchafalaya River Basin. Linking trends in stream 
nutrient levels to changes in nutrient sources will enhance our 
understanding of the effectiveness of land management actions.

Regional-scale assessments of examined trends in nutrient and 
suspended-sediment concentrations and loads in the Upper Mississippi, 
Ohio, Red, and Great Lakes River Basin, Missouri River Basin, Lower 
Mississippi, Arkansas-White-Red, and Texas-Gulf River Basin, and the 
Pacific Northwest River Basin.

For more information on how nutrients vary over time in streams assessed 
across the Nation, contact:
Lori Sprague (_lsprague at usgs.gov_ <mailto:lsprague at usgs.gov>).

For more information on how nutrients and sediment vary over time in 
selected major river basins, contact:
        David Lorenz (_lorenz at usgs.gov_ <mailto:lorenz at usgs.gov>) --- 
_Upper Mississippi, Ohio, Red, and Great Lakes River Basin_ 
<http://pubs.usgs.gov/sir/2008/5213/>
Lori Sprague (_lsprague at usgs.gov_ <mailto:lsprague at usgs.gov>) --- 
_Missouri River Basin_ <http://pubs.usgs.gov/sir/2006/5231/>
        Richard Rebich (_rarebich at usgs.gov_ <mailto:rarebich at usgs.gov>) 
--- _Lower Mississippi, Arkansas-White-Red, and Texas-Gulf River Basin_ 
<http://pubs.usgs.gov/sir/2007/5090/>
        Daniel Wise (_dawise at usgs.gov_ <mailto:dawise at usgs.gov>) --- 
_Pacific Northwest River Basin_ <http://pubs.usgs.gov/sir/2007/5186/>


 

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