2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/26/2021 | 8:30 AM - 10:30 AM | FRESHWATER LOTIC COMMUNITIES UPSTREAM AND DOWNSTREAM OF A LOW HEAD DAM BEFORE AND AFTER REMOVAL | Virtual Platform
FRESHWATER LOTIC COMMUNITIES UPSTREAM AND DOWNSTREAM OF A LOW HEAD DAM BEFORE AND AFTER REMOVAL
Low head dams can negatively impact lotic systems by interrupting community connectivity, trapping sediments and altering hydrologic patterns. Removal of dams can restore natural flow regimes, but effects on stream communities have been mixed, limiting our understanding of ecosystem recovery. The objective of this study is to document changes in stream communities before and after removal of a low head dam. The Allentown Dam, removed in August 2020, was located in the Ottawa River (Maumee River Watershed) in northwest Ohio. For two years before removal (2018, 2019), upstream and downstream communities (periphyton, macroinvertebrates, fish) and selected physicochemical parameters were monitored, along with communities at two reference sites. In 2020, the same sites were sampled post-removal and will be resampled again in 2021. Preliminary results indicate that benthic riffle communities, along with physicochemical parameters were similar upstream and downstream of the dam. Conversely, fish biomass, fish diversity and the percentage of predatory fish were higher downstream of the dam. Results suggest the dam prevented upstream movement of some fish, but did not significantly impact benthic communities. Ongoing analyses will also include comparisons to stream communities post-dam removal.
- Anthropogenic
- Connectivity
- Biological effects
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Presenters/Authors
Leslie Riley
(), Ohio Northern University, l-riley.1@onu.edu;
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Zachary Bragg
(), Ohio Northern University, z-bragg@onu.edu;
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Garrett Duktig
(), Ohio Northern University, g-duktig@onu.edu;
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Everett Meredith
(), Ohio Northern University, e-meredith@onu.edu;
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Tyler Tanto
(), Ohio Northern University, t-tanto@onu.edu;
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Devon Jackson
(), Ohio Northern University, Department of Biological & Allied Health Sciences, d-jackson.5@onu.edu;
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Robert Verb
(), Ohio Northern University, r-verb@onu.edu;
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