2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/05/2017 | 3:15 PM - 3:30 PM | INFLUENCES OF DOWNRIVER CONNECTIVITY AND SITE CONDITIONS ON RICHNESS PATTERNS OF GREAT-RIVER FISHES WITHIN FREE-FLOWING TRIBUTARY NETWORKS | 302B
INFLUENCES OF DOWNRIVER CONNECTIVITY AND SITE CONDITIONS ON RICHNESS PATTERNS OF GREAT-RIVER FISHES WITHIN FREE-FLOWING TRIBUTARY NETWORKS
Large tributaries are increasingly recognized as sources of supplemental habitat for fish species in mainstems of major river basins (Great-River Specialists [GRS]). Besides coarse relationships between richness and river size, little is known about the influences of connectivity and local habitat on distributional patterns within tributary networks. In 2016 we surveyed 22 sites throughout two 7th-order tributaries (Grand and Meramec rivers) of the Missouri and Mississippi rivers in Missouri. Fluvial distance to tributary mouth and multivariate dissimilarity between local and mainstem conditions served as indices for connectivity and longitudinal environmental gradients, respectively. We collected 29 of the potential 39 (74%) GRS in each region. Richness of GRS increased with river size within both systems (p < 0.05). Connectivity in the Grand River and environmental gradients within both rivers did not explain significant residual variation resulting from models between river size and richness; however, connectivity explained 55% of residual variation within the Meramec River. Results demonstrate varied mechanisms mediating the extent of tributary use by GRS and highlight the importance of regional connectivity for complementing known richness-river size relationships.
- C02 Fish and Other Aquatic Vertebrates
- C11 Community Ecology
- C06 Large River Ecology
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Presenters/Authors
Corey Dunn
(), Missouri Cooperative Fish and Wildlife Research Unit; University of Missouri-Columbia, cgd7n7@mizzou.edu;
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Craig Paukert
(), United States Geological Survey; Missouri Cooperative Fish and Wildlife Research Unit; University of Missouri-Columbia, paukertc@missouri.edu;
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