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New research offers prioritization plan for reducing nutrient pollution in feeder streams
February 12, 2008To help resource managers improve the health of coastal waters degraded by nutrient pollution, a group of scientists has developed a framework for prioritizing stream restoration efforts aimed at reducing the amount of nitrogen flowing downstream. The framework, published in the online version of the journal Frontiers in Ecology and the Environment, will allow practitioners to make better informed decisions regarding the design and implementation of restoration projects, which is critical for decreasing the downstream movement of nitrogen.
"Unlike previous research focusing on removing nitrogen before it reaches streams, we are investigating innovative ways to reduce excess nutrients while the water is flowing to its ultimate destination," said Dr. Margaret Palmer of the University of Maryland Center for Environmental Science. "By combining this type of restoration technique with more traditional measures - like streamside forest buffers - we should be able to help nature help us by using some of the excess nitrogen before it flows downstream."
Stream restoration has become increasingly popular across the country, yet efforts to quantify the actual amount of nitrogen removed by these costly projects are only just beginning. By providing natural resource managers with advice for prioritizing and designing projects aimed at reducing the downstream flux of nitrogen, the researchers hope to help local, state and federal restoration officials make larger nutrient pollution reductions with the limited amount of available funds.
The framework is based on identifying areas where large amounts of nitrogen loads are delivered to local streams and are then transported downstream without being used by the local ecosystem. Small streams (1st-3rd order) with considerable nitrogen loads delivered during low to moderate flows offer the greatest opportunities for nitrogen removal. The authors suggest restoration approaches that increase in-stream carbon availability, contact between the water and stream sediments, and connections between streams and adjacent terrestrial environments will be the most effective. There is strong scientific evidence that restoration projects are more likely to be successful when properly designed using such a framework.
University of Maryland Center for Environmental Science
The framework is based on identifying areas where large amounts of nitrogen loads are delivered to local streams and are then transported downstream without being used by the local ecosystem. Small streams (1st-3rd order) with considerable nitrogen loads delivered during low to moderate flows offer the greatest opportunities for nitrogen removal. The authors suggest restoration approaches that increase in-stream carbon availability, contact between the water and stream sediments, and connections between streams and adjacent terrestrial environments will be the most effective. There is strong scientific evidence that restoration projects are more likely to be successful when properly designed using such a framework.
University of Maryland Center for Environmental Science
Nutrient Pollution Current Events and Nutrient Pollution News RSSLong-term recovery of reefs from bleaching requires local action to increase resilience
In the journal Estuarine, Coastal and Shelf Science, University of Miami Rosenstiel School of Marine and Atmospheric Science Professor Dr. Peter Glynn, and 2008 Pew Fellow for Marine Conservation and Assistant Professor Dr. Andrew Baker, assess more than 25 years of data on reef ecosystems recovery from climate change-related episodes of coral bleaching.
Researchers: Molecular forklifts overcome obstacle to 'smart dust'
Algae is a livid green giveaway of nutrient pollution in a lake. Scientists would love to reproduce that action in tiny particles that would turn different colors if exposed to biological weapons, food spoilage or signs of poor health in the blood.
First map of threats to marine ecosystems shows all the world's oceans are affected
As vast and far-reaching as the world's oceans are, every square kilometer is affected by human activities, according to a study in the journal Science by researchers at the University of North Carolina at Chapel Hill and others.
Stronger EPA leadership needed to improve water quality in Mississippi River
The U.S. Environmental Protection Agency must take a more aggressive leadership role in implementing the Clean Water Act if water quality in the Mississippi River and the northern Gulf of Mexico is to improve, says a new report from the National Research Council.
Increase in ethanol production from corn could significantly impact
If projected increases in the use of corn for ethanol production occur, the harm to water quality could be considerable, and water supply problems at the regional and local levels could also arise, says a new report from the National Research Council.
Indo-Pacific coral reefs disappearing more rapidly than expected
Corals in the central and western Pacific ocean are dying faster than previously thought, University of North Carolina at Chapel Hill researchers have found.
Too much water, fertilizer bad for plant diversity
Too much of multiple good things - water or nutrients, for example - may decrease the diversity of plant life in an ecosystem while increasing the productivity of a few species, a UC Irvine scientist has discovered.
Deadly hypoxic event finally concludes
The longest, largest and most devastating hypoxic event ever observed in marine waters off the Oregon Coast has finally ended.
Changes in reef latitude
Since the 1980s, researchers have hypothesized that nutrient levels rather than temperature are the main factor controlling the latitudinal bounds of coral reefs, but the issue remains controversial.
Nutrient pollution can exacerbate coral disease outbreaks and threatens coral reef health
Wildlife diseases are one of the primary threats to coral reefs and other endangered marine ecosystems. For example, fungal and bacterial infections of reef-building corals and other key species recently caused mass-mortalities throughout the Caribbean. Species that dominated Caribbean coral reefs only twenty years ago are now functionally extinct. Little is know about the factors that promote marine diseases, but it is suspected that human activities have altered the environment, subsequently promoting disease epidemics and coral die offs. In the December issue of Ecology Letters, Bruno, Petes, Harvell, and Hettinger report that nutrient pollution can increase the severity of coral diseases
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