Extirpation for Conservation: Applying Predictors of Extinction Risk to Eradicate Introduced Trout Populations for Lake Restoration

Gray, Queenie Z.; Fraser, Dylan J.; Grant, James W. A.

doi:10.3368/er.32.1.59

Cited by 3 publications

(2 citation statements)

References 45 publications

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“…Lake trout are opportunistic life history strategists that are long-lived, large-bodied, iteroparous, and highly fecund with large eggs and independent embryos (Ruzycki, 2003;Winemiller & Rose, 1992). Stocking and a suite of adaptable life history characteristics have allowed lake trout to colonize freshwater environments outside of their native range (Fredenberg et al, 2017;Gray, Fraser, & Grant, 2014;Rosenthal, 2012). In the western United States, invasive lake trout population suppression has been performed on a number of freshwater systems (Fredenberg et al, 2017;Hansen, Horner, Liter, Peterson, & Maiolie, 2008;Martinez et al, 2009;Ng, Fredericks, & Quist, 2016), including Yellowstone Lake (Syslo et al, 2011).…”

mentioning

confidence: 99%

Revealing migration and reproductive habitat of invasive fish under an active population suppression program

Gutowsky

Romine

Heredia

et al. 2020

Conservat Sci and Prac

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Endemic species face a variety of threats including predation from non‐native invaders. In some cases, however, invasive species can be managed by directly suppressing populations, and tracking technologies that allow researchers to identify movement patterns and aggregations representative of the population can facilitate suppression activities. In Yellowstone Lake (Yellowstone National Park, Wyoming), invasive lake trout (Salvelinus namaycush) have been the target of a population suppression program for over two decades. For this form of management, the reproductive period is particularly important because fish migrate to and from spawning grounds. From 2011 to 2014, adult lake trout (n = 317) in Yellowstone Lake were tracked using acoustic biotelemetry. After controlling for spatial and temporal dependency in the data, total abundance of unique individuals was estimated where migratory trajectories occurred at confirmed spawning sites. Aggregations and migratory trajectories were further estimated at locations where spawning had not previously been observed. Across years, the greatest number of individuals was observed along a migration corridor in the southwestern area of the lake. Novel strategies for analyzing acoustic telemetry data provided insights into the behavior of an invasive fish species. By betraying the positions of conspecifics, tagged fish revealed potentially important reproductive habitats and migration corridors that warranted further investigation as possible sites for population suppression.

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mentioning

confidence: 99%

Revealing migration and reproductive habitat of invasive fish under an active population suppression program

Gutowsky

Romine

Heredia

et al. 2020

Conservat Sci and Prac

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“…Finally, iteroparous salmonids such as brook trout have short generation times (e.g. Gray et al, 2014; Letcher et al, 2007), which allows for shorter‐term studies on size‐selective harvesting that can span changes in

{\overset{truê}{N}}_{b}

{\overset{truê}{N}}_{c}

across an entire generation.…”

Section: Introductionmentioning

confidence: 99%

Demographic resilience of brook trout populations subjected to experimental size‐selective harvesting

Clarke

McCracken

Humphries

et al. 2022

Evolutionary Applications

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Sustainable management of exploited populations benefits from integrating demographic and genetic considerations into assessments, as both play a role in determining harvest yields and population persistence. This is especially important in populations subject to size‐selective harvest, because size selective harvesting has the potential to result in significant demographic, life‐history, and genetic changes. We investigated harvest‐induced changes in the effective number of breeders (Ntruêb) for introduced brook trout populations (Salvelinus fontinalis) in alpine lakes from western Canada. Three populations were subject to 3 years of size‐selective harvesting, while three control populations experienced no harvest. The Ntruêc decreased consistently across all harvested populations (on average 60.8%) but fluctuated in control populations. There were no consistent changes in Ntruêb between control or harvest populations, but one harvest population experienced a decrease in Ntruêb of 63.2%. The Ntruêb/Ntruêc ratio increased consistently across harvest lakes; however we found no evidence of genetic compensation (where variance in reproductive success decreases at lower abundance) based on changes in family evenness (trueFÊ) and the number of full‐sibling families (Ntruêfam). We found no relationship between trueFÊ and Ntruêc or between Ntruêfam/Ntruêc and trueFÊ. We posit that change in Ntruêb was buffered by constraints on breeding habitat prior to harvest, such that the same number of breeding sites were occupied before and after harvest. These results suggest that effective size in harvested populations may be resilient to considerable changes in Nc in the short‐term, but it is still important to monitor exploited populations to assess the risk of inbreeding and ensure their long‐term survival.

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Pathways of unauthorized fish introductions and types of management responses

Rahel

Smith

2018

Hydrobiologia

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Extirpation for Conservation: Applying Predictors of Extinction Risk to Eradicate Introduced Trout Populations for Lake Restoration

Cited by 3 publications

References 45 publications

Revealing migration and reproductive habitat of invasive fish under an active population suppression program

Revealing migration and reproductive habitat of invasive fish under an active population suppression program

Demographic resilience of brook trout populations subjected to experimental size‐selective harvesting

Pathways of unauthorized fish introductions and types of management responses

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