2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/23/2019 | 3:15 PM - 3:30 PM | RAZORBACK SUCKER MOVEMENTS IN NOVEL ECOSYSTEMS: RIVER-RESERVOIR EXCHANGES AND EXPERIMENTAL TRANSLOCATIONS | 250 DE
RAZORBACK SUCKER MOVEMENTS IN NOVEL ECOSYSTEMS: RIVER-RESERVOIR EXCHANGES AND EXPERIMENTAL TRANSLOCATIONS
The historically free-flowing Colorado River system is now fragmented by dams that create a complex of river and novel reservoir habitats used by contemporary populations of endangered fishes, such as Razorback Sucker (Xyrauchen texanus). We synthesized a PIT-tagging database from multi-agency efforts across the upper Colorado River basin from 2014-2018 to quantify river-reservoir exchanges of Razorback Sucker in the two main inflows of Lake Powell: the Colorado (unfragmented) and San Juan (waterfall-fragmented) rivers. Fifteen percent of fish captured in the Colorado River arm were subsequently detected in upper basin rivers, some >600 km away. Twenty-nine percent of fish captured in the San Juan River arm of Lake Powell were detected below the Piute Farms Waterfall within a year. Of 303 fish translocated upstream into the San Juan River, 80% were re-encountered downstream of the waterfall within a year. Razorback Sucker illustrate how dispersal by large river fish can maintain connectivity among populations in highly altered ecosystems. Although a mechanistic understanding of the importance of connectivity among these populations is still lacking, managing for increased connectivity would promote the maintenance of diverse life histories that increase population resilience to environmental change.
- Conservation
- Fish
- Dispersal
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Presenters/Authors
Casey Pennock
(), Kansas State University, pennock@ksu.edu;
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Mark McKinstry
(), US Burearu of Reclamation, mmckinstry@usbr.gov;
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Keith Gido
(), Kansas State University, kgido@ksu.edu;
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Nate Cathcart
(), Alaska Department of Fish and Game, cncathca@gmail.com;
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Chris Cheek
(), Purdue University, christopheracheek@gmail.com;
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Katie Creighton
(), Utah Division of Wildlife Resources, katherinecreighton@utah.gov;
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Darek Elverud
(), US Fish and Wildlife Service, darek_elverud@fws.gov;
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Travis Francis
(), US Fish and Wildlife Service, travis_francis@fws.gov;
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Eliza Gilbert
(), US Fish and Wildlife Service, eliza_gilbert@fws.gov;
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Skyler Hedden
(), Kansas State University, skyh@ksu.edu;
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Brian Hines
(), Utah Division of Wildlife Resources, bhines@utah.gov;
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Peter MacKinnon
(), Utah State University, pdmackinnon@gmail.com;
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Benjamin Schleicher
(), US Fish and Wildlife Service, benjamin_schleicher@fws.gov;
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David Speas
(), US Burearu of Reclamation, dspeas@usbr.gov;
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