2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/23/2018 | 9:45 AM - 10:00 AM | A LOW-WATER CROSSING IMPACTS LONGITUDINAL MOVEMENTS OF KNOBFIN SCULPIN (COTTUS IMMACULATUS) AND NORTHERN HOG SUCKER (HYPENTELIUM NIGRICANS) IN AN OZARK RIVER | 320
A LOW-WATER CROSSING IMPACTS LONGITUDINAL MOVEMENTS OF KNOBFIN SCULPIN (COTTUS IMMACULATUS) AND NORTHERN HOG SUCKER (HYPENTELIUM NIGRICANS) IN AN OZARK RIVER
Streams are complex networks that rely on longitudinal, vertical, and lateral connectivity to maintain natural function. The Current River, in Ozark National Scenic Riverways (OZAR), contains one low-water crossing that spans the main channel and a side channel and potentially disrupts longitudinal movement of fishes. We hypothesized that the crossing 1) restricts upstream/downstream movement during low-flow and 2) impacts smaller, weaker swimming taxa more than stronger swimmers. In July 2017, we tagged Northern hog sucker (N=50) and Knobfin sculpin (N=300) above/below the crossing with radio and PIT tags, respectively, and return monthly to monitor their movements. Thus far, results suggest that passage through the culvert-lined crossing is limited, with suckers (N=3) moving only downstream-to-upstream and sculpin (N=10) only upstream-to-downstream. Mean longitudinal distance traveled by suckers was greater in individuals tagged below the crossing than above (below: 6490m; above: 789m), and included large downstream movements (Max=49 km). Mean longitudinal distance traveled by sculpin was similar among individuals tagged above vs below the crossing (above: 64m; below: 45m). Continuing data collection will reveal whether interspecific differences are consistent during high flow and spawning periods and help inform future management decisions in OZAR.
- Connectivity
- Fragmentation
- Movement
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Presenters/Authors
Jeff Williams
(), Missouri State University, JMWilliams@MissouriState.edu;
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Hope Dodd
(), National Park Service, Hope_Dodd@nps.gov;
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Debra Finn
(), Missouri State University, dfinn@missouristate.edu;
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