2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/26/2021 | 8:30 AM - 10:30 AM | GO WITH THE FLOW: DOWNWELLING ZONES SUPPORT MORE HYPORHEIC INVERTEBRATES THAN UPWELLING ZONES IN AN OZARK STREAM | Virtual Platform
GO WITH THE FLOW: DOWNWELLING ZONES SUPPORT MORE HYPORHEIC INVERTEBRATES THAN UPWELLING ZONES IN AN OZARK STREAM
Gravel-bed streams have substantial hyporheic exchange, with downwelling zones typically occurring at riffle heads and upwelling zones at riffle tails. We collected invertebrates in upwelling and downwelling zones of a 2nd-order Ozark stream to ask how the patchy distribution of hydraulic conditions impacts spatial distribution of hyporheic invertebrate communities. Over a course of three months each in wet (Oct-Jan) and dry (June-Aug) seasons, we collected invertebrates and measured dissolved oxygen and organic matter in wells placed at three depths each at the heads and tails of three replicate riffles. Invertebrate abundance was high across all wells but varied seasonally (mean ~141 individuals/L in dry months and ~65/L in wet months), and both abundance and richness were greater in downwelling than upwelling zones across seasons and depths. Conversely, oxygen and organic matter did not vary consistently between upwelling and downwelling zones, and neither of these resources explained differences in invertebrate communities. These results suggest that hydraulic patterns alone might influence spatial distribution of hyporheic invertebrates in this stream. These findings demonstrate the importance of accounting for spatial and temporal variability when quantifying hyporheic assemblages at the reach scale.
- Connectivity
- Habitat
- Biodiversity
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Presenters/Authors
David Fleshman
(), Missouri State University , fleshman33@live.missouristate.edu;
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Debra Finn
(), Missouri State University, dfinn@missouristate.edu;
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