Predicted and Observed Responses of a Nonnative Channel Catfish Population Following Managed Removal to Aid the Recovery of Endangered Fishes

Pennock, Casey A.; Durst, Scott L.; Duran, B. R.; Hines, Brian A.; Cathcart, Charles N.; Davis, Jason; Schleicher, Benjamin J.; Franssen, Nathan R.

doi:10.1002/nafm.10056

Cited by 23 publications

(50 citation statements)

References 40 publications

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“…Our work provides a template for planning of similar efforts to conserve native fish assemblages in the context of social or logistical limitations on the use of chemical piscicides (reviewed in Peterson et al 2008). Despite documented difficulties in achieving positive population-scale responses in native fishes through suppression of invasives, or in teasing apart confounding environmental variation associated with these programs (Coggins et al 2011;Franssen et al 2014;Pennock et al 2018), managers continue to implement mechanical removal of invasive fishes. Annual costs to agencies of streamwide suppression in our study ranged from approximately US$266 000 to $336 000.…”

Section: Discussionmentioning

confidence: 99%

“…Annual costs to agencies of streamwide suppression in our study ranged from approximately US$266 000 to $336 000. While suppression is difficult and costly, improvements in demographic vital rates of native or endangered fishes may be expected when invasive fishes are reduced in density (Peterson et al 2008;Bair et al 2018;Pennock et al 2018). The suppression of invasive predators and competitors in shrinking aquatic habitats may be critical to the preservation or restoration of these unique and imperiled desert native fish assemblages (Williams et al 1985;Mueller 2005;Propst et al 2015).…”

Section: Discussionmentioning

confidence: 99%

“…Invading aquatic species are difficult to remove once established, and substantial resources are expended to suppress or otherwise manage invasives and lessen their impacts on imperiled native fishes (Mueller 2005;Coggins et al 2011;Franssen et al 2014;Zelasko et al 2016;Pennock et al 2018). Nevertheless, unambiguous positive responses in populations of native fishes are not always achieved (Coggins et al 2011;Propst et al 2015;Saunders et al 2015;reviewed in Rytwinski et al 2019).…”

Section: Introductionmentioning

confidence: 99%

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Remarkable response of native fishes to invasive trout suppression varies with trout density, temperature, and annual hydrology

Healy

Schelly

Yackulic

et al. 2020

Can. J. Fish. Aquat. Sci.

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Recovery of imperiled fishes can be achieved through suppression of invasives, but outcomes may vary with environmental conditions. We studied the response of imperiled desert fishes to an invasive brown and rainbow trout suppression program in a Colorado River tributary, with natural flow and longitudinal variation in thermal characteristics. We investigated trends in fish populations related to suppression, and tested hypotheses about the impacts of salmonid densities, hydrologic variation, and spatial-thermal gradients on the distribution and abundance of native fish species using zero-inflated generalized-linear mixed-effects models. Between 2012 and 2018, salmonids declined 89%, and native fishes increased dramatically (~480%) once trout suppression surpassed ~60%. Temperature and trout density were consistently retained in the top models predicting the abundance and distribution of native fishes. The greatest increases occurred in warmer reaches and in years with spring flooding. Surprisingly, given the evolution of native fishes in disturbance-prone systems, intense, monsoon-driven flooding limited native fish recruitment. Applied concertedly, invasive species suppression, and efforts to mimic natural flow and thermal regimes may allow rapid and widespread native fish recovery.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Remarkable response of native fishes to invasive trout suppression varies with trout density, temperature, and annual hydrology

Healy

Schelly

Yackulic

et al. 2020

Can. J. Fish. Aquat. Sci.

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“…; Pennock et al. ) and abiotic (e.g., altered flow regime; Propst and Gido ; Gido and Propst ) changes that have modified the quality and availability of habitats in the San Juan River (Franssen et al. ); however, any confounding capture‐induced mortality should similarly be minimized.…”

Section: Discussionmentioning

confidence: 99%

Age‐Specific Estimates Indicate Potential Deleterious Capture Effects and Low Survival of Stocked Juvenile Colorado Pikeminnow

Clark

Conner

Durst

et al. 2018

N American J Fish Manag

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Hatcheries and stocking programs have become necessary to repatriate or augment populations of imperiled fishes worldwide. Over nearly two decades, millions of endangered juvenile Colorado Pikeminnow Ptychocheilus lucius have been stocked into the San Juan River (Colorado, New Mexico, and Utah); however, recruitment of these individuals to adult life stages (age ≥6) remains low. Using a mark–recapture data set collected from annual riverwide electrofishing efforts between 2003 and 2016, we investigated apparent survival and capture probabilities of stocked Colorado Pikeminnow to identify age‐specific bottlenecks contributing to this lack of recruitment. With relatively high capture rates, which averaged between 0.34 and 0.39 for the first 2 years after an individual's first encounter, our results indicated that survival was consistently less than 0.25 for young age‐groups (i.e., ages 1–3), and no appreciable increase in survival occurred until fish had been in the river for at least 3 years (i.e., age ≥4+). Although age and capture effects were confounded for most age‐groups, capture appeared to reduce apparent survival for age‐2 fish by approximately 50%. The confounding effects of age, a completely hatchery‐origin population, and extensive environmental alterations to the San Juan River make it difficult to disentangle factors associated with this overall reduced juvenile survival.

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“…; Pennock et al. ), flow management (Propst and Gido ; Gido and Propst ), and stocking of hatchery‐reared fish (Furr ).…”

Section: Methodsmentioning

confidence: 99%

Feeding Ecology of Early Life Stage Razorback Sucker Relative to Other Sucker Species in the San Juan River, Utah

2019

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Low survival of early life stage (ELS) Razorback Sucker Xyrauchen texanus in the Colorado River basin, USA, is thought to cause a recruitment bottleneck. Conversely, two other native sucker species, the Bluehead Sucker Catostomus discobolus and Flannelmouth Sucker C. latipinnis, successfully recruit to adulthood. To explore a potential factor leading to this survival discrepancy among species, we used museum‐catalogued specimens collected from the San Juan River, Utah, to investigate trophic resource use of co‐occurring ELS suckers. We evaluated diet diversity and composition, expecting high overlap in diets among sucker species. All species were significantly different in median SL and varied in the ranges of developmental stages present in collections, with Razorback Sucker generally being the smallest and least developed. Size differences among sampled individuals coincided with a 1.7× higher mean diet richness for Bluehead Sucker and Flannelmouth Sucker compared to Razorback Sucker. The Bluehead Sucker was the only species for which diet richness increased significantly with fish size. Discriminant function analysis was able to distinguish Razorback Sucker from the other two species based on a low frequency of occurrence of all diet items. Nine of twelve diet item categories differed significantly in frequency of occurrence among species. Bluehead Sucker and Razorback Sucker had higher mean carbon and nitrogen stable isotope ratios (δ13C and δ15N) relative to Flannelmouth Sucker, and variation in δ13C was high among individual Flannelmouth Sucker across sites. The δ13C and δ15N of Bluehead Sucker decreased significantly with fish size, but no significant relationship was found for Flannelmouth Sucker or Razorback Sucker. The confounding issue of fish size and species identity in this data set prevented us from completely isolating either of these two effects on differences in diet richness, δ13C, and δ15N. Nevertheless, differences in diet item occurrence across sizes and species reflect differences in resource acquisition among ELS suckers that might be related to recruitment bottlenecks.

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Predicted and Observed Responses of a Nonnative Channel Catfish Population Following Managed Removal to Aid the Recovery of Endangered Fishes

Cited by 23 publications

References 40 publications

Remarkable response of native fishes to invasive trout suppression varies with trout density, temperature, and annual hydrology

Remarkable response of native fishes to invasive trout suppression varies with trout density, temperature, and annual hydrology

Age‐Specific Estimates Indicate Potential Deleterious Capture Effects and Low Survival of Stocked Juvenile Colorado Pikeminnow

Feeding Ecology of Early Life Stage Razorback Sucker Relative to Other Sucker Species in the San Juan River, Utah

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