Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 4509
Title: Assessing strategies to minimize unintended tness consequences of aquaculture on wild populations
Author: Marissa L. Baskett, Scott C. Burgess, Robin S. Waples
Publication Year: 2013
Journal: Evolutionary Applications
Volume: 6
Issue: 7
Pages: 1090-1108
Keywords: aquaculture,domestication selection,migration load,quantitative genetic model,constraint,pulsed

Arti cial propagation programs focused on production, such as commercial aqua-
culture or forestry, entail strong domestication selection. Spillover from such programs
can cause unintended tness and demographic consequences for wild conspeci cs. The
range of possible management practices to minimize such consequences vary in their
control of genetic and demographic processes. Here we use a model of coupled ge-
netic and demographic dynamics to evaluate alternative management approaches to
minimizing unintended consequences of aquaculture escapees. We nd that, if strong
natural selection occurs between escape and reproduction, an extremely maladapted
(i.e., nonlocal-origin, highly domesticated) stock could have tness consequences anal-
ogous to a weakly diverged cultured stock; otherwise, wild population tness declines
with increasing maladaptation in the cultured stock. Reducing escapees through low-
level leakage is more e ective than reducing an analogous number of escapees from
large, rare pulses. This result arises because low-level leakage leads to the continual
lowering of wild population tness and subsequent increased proportional contribution
of maladapted cultured escapees to the total population. Increased sterilization e-
cacy can cause rapid, nonlinear reductions in unintended tness consequences. Finally,
sensitivity to the stage of escape indicates a need for improved monitoring data on how
the number of escapees varies across life cycle stages.

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Notes: Open access
Theme: Recovery, Rebuilding and Sustainability of Marine and Anadromous Species
Foci: Investigate ecological and socio-economic effects of alternative management strategies or governance structures.
Maximize effectiveness and minimize impacts of artificial propagation in recovery, rebuilding and stock sustainability