Suppressing invasive brown trout networks
Only metapopulation-wide, multi-life-stage suppression quickly drove invasive brown trout toward quasi-extinction.
Source
Exploring metapopulation-scale suppression alternatives for a global invader in a river network experiencing climate change
Study at a glance
- Design
- Computational / modelling — Metapopulation PVA of invasive brown trout under removal and climate/reservoir scenarios
- N
- Simulation scenarios (18 under current climate); not an empirical sample-size study
- Population
- Modeled brown trout in Colorado River and Bright Angel Creek subpopulations
- Outcome
- Time and probability of quasi-extinction under multi-life-stage suppression
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Suppressing invasive brown trout networks
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
6 of 18 current-climate scenarios had 100% QE likelihood.
Of 18 suppression scenarios under existing climatic conditions (excluding rapid response), 6 led to a 100% likelihood of QE
Without mechanical removal, QE probability fell to 29%.
reduced the probability of QE to 29%
What they did
Built a metapopulation PVA for invasive brown trout in Colorado River and Bright Angel Creek subpopulations, comparing electrofishing, harvest, redd destruction, mechanical removal, and climate/reservoir scenarios.
What they found
Best combos reached QE in 5.7–6.3 years; skipping age-0 methods dropped QE probability to 29%; warming can shrink the mainstem but tributaries persist.
The limits
What it doesn't show
Does not field-test that managers can actually hit those suppression rates every year.
Key terms
- Quasi-extinction (QE)
- Abundance falling to 5% of carrying capacity.
- Metapopulation
- Linked subpopulations connected by dispersal.
- PVA
- Population viability analysis of extinction risk.
- Mechanical removal (MR)
- Active capture targeting multiple life stages.
- Lambda (λ)
- Finite population growth rate.
- Brown trout
- Invasive Salmo trutta in this river network.
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Invader:
Common questions
Invader?
Brown trout.
Fastest QE?
5.7 or 6.3 years.
Scenarios with 100% QE?
6 of 18 under current climate.
Without age-0 control?
QE probability 29%.
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