2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/08/2017 | 10:00 AM - 10:15 AM | LOSS OF MACROINVERTEBRATE TAXA AS A RESULT OF INCREASED SPECIFIC CONDUCTIVITY DURING DROUGHT | 302B
LOSS OF MACROINVERTEBRATE TAXA AS A RESULT OF INCREASED SPECIFIC CONDUCTIVITY DURING DROUGHT
Drought increases the risk of impairment associated with water quantity and quality. Intensive drought concentrates dissolved chemicals and reduces dilution of mineral inputs. One of the direct impacts of increased total dissolved solids (measured as specific conductivity, [SC]) is the extirpation of salt-intolerant aquatic life. We developed and used a model that estimates the proportion of extirpated genera based on background SC and a change in SC (Delta-Delta model). The loss of macroinvertebrate genera associated with increased SC as a result of drought was assessed using the 95th centile extirpation concentration (XC95) approach released by USEPA in 2011. Using either the measured or geophysical modeled change in SC during a drought as the independent variable and the Delta-Delta model, we estimated the proportion of genera extirpated at various spatial and temporal scales. We therefore identified the streams that are most vulnerable to drought and the proportion of extirpation at a national scale. These are the authors views and do not necessarily represent the views or policies of USEPA.
- S29 Macrosystem Ecology of Aquatic Systems
- C22 Disturbance
- S24 Towards a predictive freshwater ecology: using time-series data to understand and forecast responses to a changing environment
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Presenters/Authors
Lei Zheng
(), previously with Tetra Tech, Inc., lei.zheng@hotmail.com;
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John Olson
(), Dept of Applied Environmental Science, California State University Monterey Bay, CA, USA, joolson@csumb.edu;
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Susan Cormier
(), USEPA, Cormier, Susan
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