EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/24/2018 | 9:15 AM - 9:30 AM | WATER QUALITY IN WETLANDS ALONG AN URBANIZATION GRADIENT | 310 A
WATER QUALITY IN WETLANDS ALONG AN URBANIZATION GRADIENT
Urban expansion changes native ecosystems, which may limit ecosystem services provision and alter their function. Increased impervious surface, one trait of urbanization, has been linked to augmented concentrations of nutrients in nearby waterways, which can have serious implications for biological processes. Valdivia, Chile is a small city with large wetlands that may be important for water purification. However, urban wetland area has declined due to development. We tested the hypothesis that water quality in wetlands would change along an urbanization gradient, defined by quantifying the amount of impervious surface in the area draining to the wetland. We sampled water from 82 locations in Valdivia’s wetlands and predicted that concentrations of ammonium, nitrate, and phosphate would decline along the impervious surface gradient. After separating sites into categories of low, medium, and high amounts of impervious surface area, we found that there were no differences in phosphate or ammonium concentrations, but nitrate was significantly higher in high and medium categories than in the low category (p<0.05). These findings pave the way for in situ experiments to determine whether nutrient retention efficiency also changes along this gradient.
- Wetland
- Nutrients
- Nitrogen
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Presenters/Authors
Stephen Elser
(), Arizona State University, selser2014@gmail.com;
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Elizabeth Cook
(), The New School, elizabeth.m.cook@gmail.com ;
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Olga Barbosa
(), Universidad Austral de Chile, olgabarbosa@gmail.com ;
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Nancy Grimm
(), Arizona State University, nbgrimm@asu.edu;
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