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Researcher strives for watershed moment
Date:5/21/2008

London, ON According to the World Health Organization, water scarcity affects four out of every 10 people around the world and population growth, urbanization and increased domestic and industrial water use are making the problem worse. By examining the relationship between global warming and pollution, a researcher at The University of Western Ontario hopes to help protect future water resources.

Western geography professor Katrina Moser studies the physical, chemical and biological characteristics of water and sediment to better understand the complex dynamics that exist between climate change, nutrient enrichment and lake systems. Nutrient enrichment refers to the presence of increased nutrients including nitrogen and phosphorous in lakes, which often results from human activities like increased or changed agricultural practices. It can lead to toxic algal blooms, decreased oxygen in the water, fish deaths and other problems. Fossils and geochemical signals preserved in lake and river sediment provide valuable clues about historical changes to the environment and can demonstrate human impact going back thousands of years.

Where there is now strong evidence that the rapid rise in global temperatures over the last century is due to the unprecedented increase in greenhouse gases related to human activities, it is less certain how these global changes will affect regional temperature, hydroclimates and aquatic ecosystems, Moser says. She was awarded $20,000 from the Natural Sciences and Engineering Research Council (NSERC) this morning to conduct her studies.

While the synergy between warming temperatures and nutrient enrichment from human activities is not well understood, Moser has found that the human footprint extends into remote areas generally unoccupied by humans, including in so-called pristine mountain and Arctic lakes. Understanding this dynamic is important as it may have a marked impact on future water quality and
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Contact: Douglas Keddy
dkeddy@uwo.ca
519-661-2111 x87485
University of Western Ontario
Source:Eurekalert

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