2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2018 | 11:00 AM - 11:15 AM | INTERACTIVE EFFECTS OF HYDROGEOMORPHIC CHARACTERISTICS ON FISH COMMUNITY STRUCTURE IN A FLOODPLAIN RIVER | 410 B
INTERACTIVE EFFECTS OF HYDROGEOMORPHIC CHARACTERISTICS ON FISH COMMUNITY STRUCTURE IN A FLOODPLAIN RIVER
This study examined how hydrogeomorphic attributes of off-channel habitats of a floodplain river determine composition of fish communities. Fish were collected from 27 lateral habitats in the Upper Mississippi River using multiple collecting gears. Fish data were standardized by conversion to catch-per-unit-effort followed by determination of relative abundance. Twenty-two hydrological and geomorphological variables were generated for each site. Cluster analysis of hydrogeomorphic data identified three groups: floodplain lakes (Lakes); a mixed group of floodplain lakes and backwaters that disconnected periodically (Mixed); and backwaters that remained fully connected (Backwaters). Similarity among sites within each hydrogeomorphic group was predominantly accounted for by: hydrological variables (Lakes); combination of hydrological and geomorphic variables (Mixed); geomorphic variables (Backwaters). Analysis of similarity (ANOSIM) revealed significant differences in fish community composition that correlated with hydrogeomorphic grouping. This study demonstrated that lateral habitats of the Upper Mississippi River exhibit distinct hydrogeomorphic characteristics; and, that their distinctive attributes shape organization and abundance of fish communities within this riverine landscape. This study illustrates the need to apply appropriate measures of both hydrology and geomorphology to address the complex dynamics of slackwaters for both river research and management.
- Geomorphology
- Floodplain
- Community
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Presenters/Authors
Michael Delong
(), Winnona State University, MDelong@winona.edu ;
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Martin Thoms
(), University of New England, Armidale, NSW Australia, mthoms2@une.edu.au;
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Ethan Sorensen
(), Winona State University, esorenson14@winona.edu;
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