Baseline demographics of a non‐native lake trout population and inferences for suppression from sensitivity‐elasticity analyses

Cox, Benjamin S.; Guy, Christopher S.; Fredenberg, Wade; Rosenthal, Leo

doi:10.1111/fme.12024

Cited by 23 publications

(64 citation statements)

References 49 publications

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“…Using age, length and maturity data collected from lake trout ( n = 292), sex‐specific length and age at 50% maturity were estimated using a logistic regression model for the binary response data (Heibo & Vollestad ; Cox et al . ). Ninety‐five percent confidence intervals for the estimated length and age at 50% maturity were calculated using 5000 bootstrap data sets randomly sampled with replacement.…”

Section: Methodsmentioning

confidence: 97%

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Suppression of invasive lake trout in an isolated backcountry lake in Glacier National Park

Fredenberg

Muhlfeld

Guy

et al. 2017

Fisheries Management Eco

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Fisheries managers have implemented suppression programmes to control non‐native lake trout, Salvelinus namaycush (Walbaum), in several lakes throughout the western United States. This study determined the feasibility of experimentally suppressing lake trout using gillnets in an isolated backcountry lake in Glacier National Park, Montana, USA, for the conservation of threatened bull trout, Salvelinus confluentus (Suckley). The demographics of the lake trout population during suppression (2009–2013) were described, and those data were used to assess the effects of suppression scenarios on population growth rate (λ) using an age‐structured population model. Model simulations indicated that the population was growing exponentially (λ = 1.23, 95% CI: 1.16–1.28) prior to suppression. However, suppression resulted in declining λ (0.61–0.79) for lake trout, which was concomitant with stable bull trout adult abundances. Continued suppression at or above observed exploitation levels is needed to ensure continued population declines.

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Section: Methodsmentioning

confidence: 97%

“…Sex‐specific models were used because male lake trout may mature at younger ages and smaller sizes than females (Cox et al . ). Predicted female probability at maturity ( p i ) was used to model fertility in matrix population models (below).…”

Section: Methodsmentioning

confidence: 97%

Suppression of invasive lake trout in an isolated backcountry lake in Glacier National Park

Fredenberg

Muhlfeld

Guy

et al. 2017

Fisheries Management Eco

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“…; Cox et al. ; Kerns and Lombardi‐Carlson ). Our study provides insight on the population dynamics and potential population‐level responses under various management scenarios for White Sturgeon in the SSJ.…”

Section: Discussionmentioning

confidence: 99%

“…We set the variance to be 20% of the mean value if a vital rate was obtained from the literature without a listed SE (Cox et al. ; Ng et al. ).…”

Section: Methodsmentioning

confidence: 99%

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Population Dynamics and Evaluation of Management Scenarios for White Sturgeon in the Sacramento–San Joaquin River Basin

Blackburn

Gingras

DuBois

et al. 2019

N American J Fish Manag

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Recent surveys suggest a declining population of White Sturgeon Acipenser transmontanus in the Sacramento–San Joaquin River basin (SSJ), California. Probable reasons for the decline include overharvest and habitat degradation compounded by poor recruitment during recent droughts. Despite the importance and status of White Sturgeon, knowledge of their population dynamics in the SSJ remains incomplete and additional information is needed to further inform management decisions. The purpose of this study was to evaluate the population dynamics of White Sturgeon in the SSJ and use the information to estimate the population‐level response under plausible management scenarios. White Sturgeon in the SSJ exhibited fast growth and high rates of mortality and experienced relatively high levels of exploitation. Under current conditions, the population will likely continue to decrease (population growth rate λ = 0.97); however, there was considerable uncertainty in estimates of future population growth. Population growth of White Sturgeon in the SSJ was most influenced by the survival of sexually mature adults. The models also suggested that White Sturgeon in the SSJ could reach the replacement rate (i.e., λ ≥ 1.00) if total annual mortality for age‐3 and older fish does not exceed 6%. Low levels of exploitation (i.e., <3%) would likely be required to maintain a stable population.

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In‐Situ Evaluation of Benthic Suffocation Methods for Suppression of Invasive Lake Trout Embryos in Yellowstone Lake

Thomas

Guy

Koel

et al. 2019

N American J Fish Manag

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Suppression of invasive Lake Trout Salvelinus namaycush is an important management tool to use in native fish and ecosystem conservation throughout the U.S. Intermountain West. Lake Trout suppression, primarily by gill netting, has been ongoing in Yellowstone Lake, Yellowstone National Park, Wyoming, since 1995. Additional methods that cause mortality of Lake Trout embryos could be used simultaneously with gill netting to enhance suppression. Our objective was to evaluate the in‐situ efficacy of two benthic suffocation methods—tarping with gas‐impermeable tarps and Lake Trout carcass deposition to increase the mortality of Lake Trout embryos. Tarping did not increase embryo mortality; mean control mortality was 21 ± 1.9% (mean ± SE), and mean tarp‐treatment mortality was 20 ± 2.9%. Lake Trout carcass deposition caused 98 ± 1.2% mean mortality of embryos at the substrate surface and 100 ± 0.1% mean mortality of embryos 20 cm below the substrate surface. Hypoxic conditions in the carcass treatments were probably the cause of the high embryo mortality; dissolved oxygen concentrations at the substrate surface declined from 7.74 to 0.06 mg/L when carcasses remained on the treatment locations. The deposition of Lake Trout carcasses shows potential to be an additional suppression method that can induce mortality in Lake Trout embryos through benthic suffocation and could be implemented at Lake Trout spawning sites in Yellowstone Lake.

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Baseline demographics of a non‐native lake trout population and inferences for suppression from sensitivity‐elasticity analyses

Cited by 23 publications

References 49 publications

Suppression of invasive lake trout in an isolated backcountry lake in Glacier National Park

Suppression of invasive lake trout in an isolated backcountry lake in Glacier National Park

Population Dynamics and Evaluation of Management Scenarios for White Sturgeon in the Sacramento–San Joaquin River Basin

In‐Situ Evaluation of Benthic Suffocation Methods for Suppression of Invasive Lake Trout Embryos in Yellowstone Lake

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