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On the reproductive success of early-generation hatchery fish in the wild

ScholarsArchive at Oregon State University

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Title On the reproductive success of early-generation hatchery fish in the wild
Names Christie, Mark R. (creator)
Ford, Michael J. (creator)
Blouin, Michael S. (creator)
Date Issued 2014-09 (iso8601)
Note To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by the author(s) and published by John Wiley & Sons Ltd. The published article can be found at: http://onlinelibrary.wiley.com/journal/10.1111/%28ISSN%291752-4571.
Abstract Large numbers of hatchery salmon spawn in wild populations each year. Hatchery
fish with multiple generations of hatchery ancestry often have heritably lower
reproductive success than wild fish and may reduce the fitness of an entire population.
Whether this reduced fitness also occurs for hatchery fish created with
local- and predominantly wild-origin parents remains controversial. Here, we
review recent studies on the reproductive success of such ‘early-generation’
hatchery fish that spawn in the wild. Combining 51 estimates from six studies on
four salmon species, we found that (i) early-generation hatchery fish averaged
only half the reproductive success of their wild-origin counterparts when spawning
in the wild, (ii) the reduction in reproductive success was more severe for
males than for females, and (iii) all species showed reduced fitness due to hatchery
rearing. We review commonalities among studies that point to possible
mechanisms (e.g., environmental versus genetic effects). Furthermore, we illustrate
that sample sizes typical of these studies result in low statistical power to
detect fitness differences unless the differences are substantial. This review demonstrates
that reduced fitness of early-generation hatchery fish may be a general
phenomenon. Future research should focus on determining the causes of those
fitness reductions and whether they lead to long-term reductions in the fitness of
wild populations.
Genre Article
Access Condition http://creativecommons.org/licenses/by/3.0/us/
Topic captive breeding
Identifier Christie, M. R., Ford, M. J. and Blouin, M. S. (2014). On the reproductive success of early-generation hatchery fish in the wild. Evolutionary Applications, 7(8), 883–896. doi:10.1111/eva.12183

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