Moving repatriation efforts forward for imperilled Canadian freshwater fishes

Lamothe, Karl A.; Drake, D. Andrew R.

doi:10.1139/cjfas-2018-0295

Cited by 24 publications

(16 citation statements)

References 69 publications

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“…Identifying interactions between elevated temperatures and other prominent stressors in pugnose shiner habitat could provide additional opportunities for local interventions. Second, this research suggests potential for more adaptive strategies, including informing introduction and repatriation initiatives, which represent an important, but under‐used, conservation approach for imperilled freshwater fishes (Lamothe & Drake, 2019). In September 2016, pugnose shiner was re‐introduced into Chaumont Bay by the New York State Department of Environmental Conservation using individuals from the SUNY Cobleskill broodstock pond, with apparent successful reproduction 2 years later (Haynes et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Coping with climate change: Phenotypic plasticity in an imperilled freshwater fish in response to elevated water temperature

Potts

Mandrak

Chapman

2021

Aquatic Conservation

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Climate change has emerged as an increasingly important threat to freshwater systems. To cope with rapidly changing thermal regimes, freshwater fishes must either relocate or adjust through genetic adaptation and/or phenotypic plasticity. Short‐term responses to elevated water temperature have been well studied in freshwater fishes; however, far less is understood about change induced by long‐term exposure. Furthermore, few studies have investigated the effects of temperature on already imperilled species, which may be more sensitive to environmental change. This study investigated the effects of rearing temperature on critical thermal maximum (CTmax), agitation temperature (Tag, temperature at which fish show behavioural signs of thermal stress) and gill size in pugnose shiner, Notropis anogenus, a threatened species in Canada. Juvenile pugnose shiner were reared for 4 months across five different ecologically relevant temperatures. CTmax and Tag were measured under normoxia and acute exposure to hypoxia to test for oxygen sensitivity of the upper thermal limits in this species. CTmax increased with elevated water temperature. Tag also increased with rearing temperature and occurred, on average, 4.3°C above acclimation temperatures. The CTmax and Tag were lower when fish were exposed acutely to hypoxia. Interestingly, gill size (e.g. total gill filament length) increased with rearing temperature, which may increase oxygen uptake capacity and support increased metabolic demands of warmer waters. Overall, pugnose shiner show plasticity in several traits in response to long‐term exposure to elevated water temperature that may facilitate persistence in warmer waters. However, acute hypoxia exposure reduced thermal tolerance, stressing the importance of evaluating interactive effects of multiple stressors. Identifying source populations of pugnose shiner with greater thermal tolerance or implementing captive breeding under higher temperature regimes may improve the success of re‐introduction efforts in the face of climate change, but the consequences to fitness of increased thermal tolerance should be examined.

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Section: Discussionmentioning

confidence: 99%

Coping with climate change: Phenotypic plasticity in an imperilled freshwater fish in response to elevated water temperature

Potts

Mandrak

Chapman

2021

Aquatic Conservation

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“…Consistent monitoring of translocated populations over several years was required to collect the data necessary to determine that all criteria for establishment were met. Monitoring has been identified as one of the most important components of any translocation effort and is often required for many years after the final stocking (Lamothe and Drake 2019). Previous meta‐analyses of reintroduction success found no relationship between the duration of monitoring and the perceived success of the reintroduction effort (Cochran‐Biederman et al 2015).…”

Section: Discussionmentioning

confidence: 99%

Successful Restoration of a Native Fish Assemblage in the Blue River, Arizona

Hickerson

Grube

Mosher

et al. 2021

N American J Fish Manag

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Translocation is one of the most commonly proposed management actions for securing and recovering native fish species. However, the success of native fish translocations has varied widely due to several limiting factors, including the presence of nonnative fishes. The Blue River Native Fish Restoration Project involved construction of a fish passage barrier, removal of nonnative fish, translocation of three native fish species (Spikedace Meda fulgida, Loach Minnow Rhinichthys cobitis, and Roundtail Chub Gila robusta), and monitoring to determine the success of these actions. After construction of a physical fish passage barrier, the three focal species were stocked several times upstream of the barrier. Nonnative fish were removed annually using multiple gear types, including spearfishing, backpack electrofishing, and trapping. Monitoring data demonstrated a significant shift in the fish assemblage from one with a substantial component of nonnative fishes to one that was exclusively native fishes. Persistence, reproduction, increased abundance, and dispersal were documented for all three focal species within the study area, meeting criteria for establishment success. All nonnative fishes, including the primary targets of removal efforts—Channel Catfish Ictalurus punctatus and Green Sunfish Lepomis cyanellus—were successfully suppressed, if not eradicated entirely, during the study period. Our results illustrate the importance of long‐term monitoring to track and successfully achieve native fish recovery goals. In addition, our results demonstrate that nonnative fish can be mechanically removed from warmwater streams if initial abundance is low, distribution is restricted, and fish passage barriers are in place. Results from this study may be informative for managers hoping to improve the conservation status of warmwater stream fishes through creation of a fish passage barrier, nonnative species removal, and native fish translocation efforts.

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“…Understanding how hatchery practices, environmental conditions, and species-specific traits interact to influence reintroduction success should help to refine this increasingly necessary conservation action (Cochran-Biederman et al, 2015;Lamothe & Drake, 2019).…”

Section: Introductionmentioning

confidence: 99%

Effective number of breeders and reconstructed sibships reveal low reproductive output by a reintroduced population of endangered fish

Diver

Mussmann

Durst

et al. 2021

Aquatic Conservation

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1. Fishes with periodic life histories are long-lived, slow to mature, and have intermittent periods of successful recruitment, limiting the ability of managers to recover their populations rapidly.2. Endangered razorback sucker (Xyrauchen texanus) in the Colorado River Basin, USA, is a periodic strategist whose persistence is largely dependent on hatchery augmentation. Stocking efforts have increased population sizes in the basin; however, natural recruitment remains extremely limited. 3. Annual reproductive output of a reintroduced population of razorback sucker was evaluated over a 10-year period in a Colorado River tributary by estimating the effective number of breeders (N b ) and numbers of repeat spawning adults through genetic analysis of wild-spawned larval cohorts. Comparative estimates were also obtained for a self-sustaining sympatric periodic strategist, flannelmouth sucker (Catostomus latipinnis). 4. Given known trade-offs between delayed maturation and long lifespan, population size and age-structure of razorback sucker was quantified to assess potential demographic constraints to reproductive output. 5. The results showed consistently low annual N b estimates for razorback sucker (x h = 127), compared with flannelmouth sucker (x h = 3,022) and within the same period (2013-2018) an order of magnitude more repeat spawning individual razorback sucker (n = 41) were detected compared with flannelmouth sucker (n = 4). Given the relatively young age structure of the razorback sucker population (median = age 4), the results indicate that successful recruitment may be limited by the number of spawning adults.6. These results highlight the importance of understanding how life history characteristics may affect the rate and success of reintroductions and where life-stage specific bottlenecks to reproduction and recruitment may occur. Given the increasing necessity of stocking for most reintroductions, management of periodic strategists may need to aim at increasing the relative age-structure of adults to bolster reproductive output in addition to increasing juvenile survival.

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Moving repatriation efforts forward for imperilled Canadian freshwater fishes

Cited by 24 publications

References 69 publications

Coping with climate change: Phenotypic plasticity in an imperilled freshwater fish in response to elevated water temperature

Coping with climate change: Phenotypic plasticity in an imperilled freshwater fish in response to elevated water temperature

Successful Restoration of a Native Fish Assemblage in the Blue River, Arizona

Effective number of breeders and reconstructed sibships reveal low reproductive output by a reintroduced population of endangered fish

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