2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/05/2017 | 9:15 AM - 9:30 AM | EVALUATING INVERTEBRATE RESPONSES TO FLOW, LAND USE, AND LEVEL III ECOREGIONS IN THE DELAWARE RIVER BASIN | 302C
EVALUATING INVERTEBRATE RESPONSES TO FLOW, LAND USE, AND LEVEL III ECOREGIONS IN THE DELAWARE RIVER BASIN
The effects of land use, flow characteristics, and regionalization (level III ecoregions) on invertebrate assemblages were studied in the Delaware River Basin (DRB) using monitoring data from 1,488 sites obtained from 9 different agencies. Modeling methods including regression tree analysis (RT) were performed to identify significant environmental variables and model their relations with invertebrate responses (e.g., richness, EPT). Landscape scale attributes such as Level III ecoregions and land use (forest, urban, agriculture) strongly influenced invertebrate responses and often dwarfed the 24 flow metrics (magnitude, duration, timing) evaluated. These results indicate that the conditional effects of land form need to be considered when developing flow-response models. When only flow metrics were considered as predictors in the RT analyses, amplitude and measures of flow frequency were the most important predictors for all metrics studied. The information obtained from analyses of DRB data is being incorporated into ongoing modeling efforts aimed at facilitating more rigorous testing of flow-biology hypotheses and a better understanding of landscape effects on flow characteristics.
- S14 Stressors in linked aquatic-terrestrial ecosystems: New developments and solutions
- C14 Hydroecology
- S31 Moving forward in flow ecology: identifying and testing key hypotheses
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Presenters/Authors
Jonathan Kennen
(), U.S. Geological Survey, New Jersey Water Science Center, 3450 Princeton Pike, Suite 110, Lawrenceville, NJ 08648, jgkennen@usgs.gov;
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Thomas Cuffney
(), U.S. Geological Survey, South Atlantic Water Science Center, 3916 Sunset Ridge Rd., Raleigh, NC 27607, tcuffney@usgs.gov;
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