Event Title

What Are the Odds? Reframing Fitness in a Changing Environment

Presentation Abstract

Fitness – the propensity to survive and reproduce in a particular environment – is a function of different environments and genotypes. Fitness incorporates the notion of probability, but in fisheries management questions about hatcheries, these probabilities are rarely presented or discussed. This contributes to lack of transparency and confusion between the potential biological effects of artificial propagation and policy positions about the level of acceptable risk. Here we present a knowledge-based, Bayesian assessment tool that describes overall and disaggregated probabilities of loss of fitness from three different mechanisms associated with different salmon hatchery scenarios: antagonistic selection in hatchery and wild environments, relaxation of selection from the wild, and effects of small population size. Hatchery scenarios were based on an extensive review of anadromous hatchery programs in the Pacific Northwest and range from highly intensive intervention in salmonid life-cycles, such as captive breeding programs, to those where there is little intervention. We compare these results with examples of habitat change on fitness driven by society’s needs for development and transportation. We conclude by describing a framework for integrating management decisions about the potential effects of habitat change and hatchery production on fitness that is necessary for salmon recovery.

Session Title

General species and food webs

Conference Track

Species and Food Webs

Conference Name

Salish Sea Ecosystem Conference (2016 : Vancouver, B.C.)

Document Type

Event

Location

2016SSEC

Type of Presentation

Oral

Contributing Repository

Digital content made available by University Archives, Heritage Resources, Western Libraries, Western Washington University.

Rights

This resource is displayed for educational purposes only and may be subject to U.S. and international copyright laws. For more information about rights or obtaining copies of this resource, please contact University Archives, Heritage Resources, Western Libraries, Western Washington University, Bellingham, WA 98225-9103, USA (360-650-7534; heritage.resources@wwu.edu) and refer to the collection name and identifier. Any materials cited must be attributed to the Salish Sea Ecosystem Conference Records, University Archives, Heritage Resources, Western Libraries, Western Washington University.

Type

Text

Language

English

Format

application/pdf

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What Are the Odds? Reframing Fitness in a Changing Environment

2016SSEC

Fitness – the propensity to survive and reproduce in a particular environment – is a function of different environments and genotypes. Fitness incorporates the notion of probability, but in fisheries management questions about hatcheries, these probabilities are rarely presented or discussed. This contributes to lack of transparency and confusion between the potential biological effects of artificial propagation and policy positions about the level of acceptable risk. Here we present a knowledge-based, Bayesian assessment tool that describes overall and disaggregated probabilities of loss of fitness from three different mechanisms associated with different salmon hatchery scenarios: antagonistic selection in hatchery and wild environments, relaxation of selection from the wild, and effects of small population size. Hatchery scenarios were based on an extensive review of anadromous hatchery programs in the Pacific Northwest and range from highly intensive intervention in salmonid life-cycles, such as captive breeding programs, to those where there is little intervention. We compare these results with examples of habitat change on fitness driven by society’s needs for development and transportation. We conclude by describing a framework for integrating management decisions about the potential effects of habitat change and hatchery production on fitness that is necessary for salmon recovery.