2023
DOI: 10.1139/cjfas-2022-0231
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Impeding access to tributary spawning habitat and releasing experimental fall-timed floods increase brown trout immigration into a dam’s tailwater

Abstract: River ecosystems have been altered by flow regulation and species introductions. Regulated flow regimes often include releases designed to benefit certain species or restore ecosystem processes, and invasive species suppression programs may include efforts to restrict access to spawning habitat. The impacts of these management interventions are often uncertain. Here, we assess hypotheses regarding introduced brown trout (Salmo trutta) movement in a regulated river. We model mark-recapture data in a multistate … Show more

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Cited by 6 publications
(10 citation statements)
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“…Until recently (after ~2014), the Grand Canyon humpback chub population has been primarily sustained through reproduction and recruitment in a single tributary with suitable temperatures for reproduction-the Little Colorado River (Coggins et al, 2006). Recovery actions for humpback chub have focused on increasing population redundancy through translocations to additional tributaries outside of the Little Colorado River (Spurgeon et al, 2015a;Healy et al, 2020a), expansion of the population within Little Colorado River (Stone et al, 2020;Yackulic et al, 2021), suppression of invasive fishes to enhance juvenile humpback chub recruitment (Coggins et al, 2011;Healy et al, 2020b), and flow experiments to enhance backwater habitats using Glen Canyon Dam discharge (Dodrill et al, 2015;Healy et al, 2022c). Through evaluations of the efficacy of these actions and extensive research and monitoring conducted in tributaries and the mainstem, broad insights into the population ecology of humpback chub and knowledge of the species' life history requirements have been gained.…”
Section: Humpback Chub In Lower Colorado River Grand Canyon United St...mentioning
confidence: 99%
See 1 more Smart Citation
“…Until recently (after ~2014), the Grand Canyon humpback chub population has been primarily sustained through reproduction and recruitment in a single tributary with suitable temperatures for reproduction-the Little Colorado River (Coggins et al, 2006). Recovery actions for humpback chub have focused on increasing population redundancy through translocations to additional tributaries outside of the Little Colorado River (Spurgeon et al, 2015a;Healy et al, 2020a), expansion of the population within Little Colorado River (Stone et al, 2020;Yackulic et al, 2021), suppression of invasive fishes to enhance juvenile humpback chub recruitment (Coggins et al, 2011;Healy et al, 2020b), and flow experiments to enhance backwater habitats using Glen Canyon Dam discharge (Dodrill et al, 2015;Healy et al, 2022c). Through evaluations of the efficacy of these actions and extensive research and monitoring conducted in tributaries and the mainstem, broad insights into the population ecology of humpback chub and knowledge of the species' life history requirements have been gained.…”
Section: Humpback Chub In Lower Colorado River Grand Canyon United St...mentioning
confidence: 99%
“…• In general, tributaries may have less geopolitical emphasis, and therefore, it may be easier to reach consensus on conservation and restoration actions National Parks; (Lawrence et al, 2011) • Loss of energy production capacity and revenue during flow manipulations needed to restore habitat in mainstem rivers may be high and outcomes for native biota may be uncertain. Whereas, degree of flow alteration in some tributaries may be lower or regulated flows may be easier to manage with lower loss of income for utility companies Glen Canyon Dam (Melis, 2011;Melis et al, 2015;Cross et al, 2011;Healy et al, 2022c) • Tributaries may be farther from the leading edge of species invasions, and invasive species control or eradication may be more feasible in smaller tributary habitats Colorado River and tributaries (Mueller, 2005;Coggins et al, 2011;Healy et al, 2022b) • Monitoring may be less expensive, and the outcomes of restoration and management may be easier to achieve and detect in tributaries Swan and Brown (2017) • Smaller watersheds are likely to have fewer cumulative stressors to address Pracheil et al (2013) • Fewer competing management conflicts than in mainstem rivers…”
Section: Opportunitiesmentioning
confidence: 99%
“…Age 0 brown trout increased dramatically in BACU in 2020 despite very low spawning adult densities in 2019 for instance (Appendix S4 ). Immigration may also increase when stimulated by high flow experiments (Healy, Yackulic, et al., 2022 ; Runge et al., 2018 ), which could reduce the effectiveness of a rapid response. Nonetheless, observed declines in BAC subpopulations were generally matched by simulations (Appendix S4 ; Healy et al., 2020 ).…”
Section: Discussionmentioning
confidence: 99%
“…The species recently expanded ∼147 km upstream through the CR into the Glen Canyon Dam tailwater, where a second reproducing subpopulation became established (Runge et al., 2018 ) (Figure 1 ). Colonization of the tailwater from GCNP was likely facilitated by fall high flow experiments beginning in 2013 (Healy, Yackulic, et al., 2022 ; Runge et al., 2018 ); movement in salmonids is commonly stimulated by flow (Davis et al., 2015 ).…”
Section: Methodsmentioning
confidence: 99%
“…Developing and testing dam releases that inform decisions on when, where, and how much water to release from reservoirs to ensure native fi sh persistence during megadroughts is only a fi rst step because more effi cient water use is needed. Because some fl ow experiments, albeit limited by water supply, have shown little benefi ts to native fi shes or unintended positive effects on invasive species (Healy et al 2022a(Healy et al , 2022b, continued efforts to refi ne and test new approaches are needed. Reservoir managers may be forced to retain spring snowmelt runoff rather than releasing it to mimic a natural fl ow regime as water levels reach critically low levels.…”
Section: Hydrology/environmental Flowsmentioning
confidence: 99%