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Modeling Populations of Adaptive Individuals$
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Steven F. Railsback and Bret C. Harvey

Print publication date: 2020

Print ISBN-13: 9780691195285

Published to Princeton Scholarship Online: January 2021

DOI: 10.23943/princeton/9780691195285.001.0001

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Example Four: Facultative Anadromy in Salmonid Fishes

Example Four: Facultative Anadromy in Salmonid Fishes

(p.86) Chapter 7 Example Four: Facultative Anadromy in Salmonid Fishes
Modeling Populations of Adaptive Individuals
Steven F. Railsback, Bret C. Harvey
Princeton University Press

This chapter offers a fourth example model, with the objective of (1) illustrating the application of state- and prediction-based theory (SPT) to a new kind of decision—a life history decision—in a case where dynamic state variable modeling (DSVM) has been applied successfully; and (2) describing the unique ability of models utilizing SPT to address population-level questions of particular interest to conservationists and managers. In this case, SPT produced individual-level decisions similar to those of DSVM, but including them in a population-level model led to quite different conclusions than those implied by the individual-level DSVM analysis. Salmonid fishes exhibit amazing life history diversity. One fundamental distinction among salmonid life histories is whether or not individuals migrate to the ocean. In general, facultative anadromy can be seen as an adaptive behavior that trades off the fitness benefits of going to the ocean versus those of remaining resident. The anadromy versus residency decision is important to fish conservation and resource management.

Keywords:   state-based theory, prediction-based theory, dynamic state variable modeling, salmonid fishes, life history, salmonid life histories, facultative anadromy, adaptive behavior, fish conservation, resource management

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