2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/24/2018 | 2:45 PM - 3:00 PM | SIMILAR PROCESSES EXPLAIN WATER QUALITY IN ARTIFICIAL AND NATURAL US LAKES | 430 B
SIMILAR PROCESSES EXPLAIN WATER QUALITY IN ARTIFICIAL AND NATURAL US LAKES
In 2007 and 2012, the US EPA sampled approximately 1,000 US lakes, reservoirs, and ponds for its National Lakes Assessment. Scientists sampled different lakes between years; each year included roughly half manmade lakes and half lakes of geologic origin. They assessed up to 30 standard biological, physical, chemical, and recreational indicators of water quality. In the EPA's first report based on 2007 data only, authors stressed the low quality of artificial lakes relative to natural lakes, without parsing causes. Their later report including 2012 data focused on the limited changes between years, and still did not account for the causes of the disparity. We wanted to know if the processes leading to worse average outcomes in artificial lakes were the same as in natural lakes, with the artificial lakes simply subjected to greater stress, or if ecosystem processes in artificial lakes actually differed. We assessed this question with structural equations models, and found that artificial and natural lakes go through indistinguishable processes of eutrophication, leading to turbidity and lowered dissolved oxygen, in response to nutrient loading. Thus, reasons for problems in these natural and artificial lakes appear similar.
- Anthropogenic
- Multi-stressors
- Structure
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Presenters/Authors
Chelsea Clifford
(), Iowa State University, chelseaclifford@gmail.com;
ASHA DISCLOSURE:
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Nonfinancial -
Jim Heffernan
(), Duke University, james.heffernan@duke.edu;
ASHA DISCLOSURE:
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Nonfinancial -