2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/21/2019 | 11:15 AM - 11:30 AM | DO URBAN MULTI-STRESSORS AND THEIR EFFECTS ON STREAM BIOTA SHIFT DURING DROUGHTS? | 251 AB

DO URBAN MULTI-STRESSORS AND THEIR EFFECTS ON STREAM BIOTA SHIFT DURING DROUGHTS?

In 2015 during a 30-year drought, U.S. Geological Survey sampled 87 streams across an urban disturbance gradient in the Pacific Northwest region (PNR) of the U.S. Objectives were to assess how aquatic assemblages respond to multiple stressors and how drought conditions modulate them. Ecological condition was assessed in relation to streamflow, habitat, nutrients, and contaminants. Streams were sampled for algae, macroinvertebrates, and fish in the summer under base-flow conditions. Response models developed using Boosted Regression Trees indicate that flow alteration accounted for less of the variability in ecological condition than might be expected in urban systems, likely due to drought conditions. Contaminants were among the most important explanatory variables in the invertebrate and algal models; this was surprising considering there were few if any storm generated run-off events during our sampling. Temperature and water depth were common variables in the fish models. Explanatory variables in the three biotic assemblage models under drought conditions in the PNR appeared to have shifted from what might be expected and also differ from many other urban studies.

Urban
Bioassessment
Modeling

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Presenters/Authors

Ian Waite (), U.S. Geological Survey, Portland, OR, iwaite@usgs.gov;