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Fish Ecology, Evolution, and ExploitationA New Theoretical Synthesis$
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Ken H. Andersen

Print publication date: 2019

Print ISBN-13: 9780691192956

Published to Princeton Scholarship Online: January 2020

DOI: 10.23943/princeton/9780691192956.001.0001

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Fisheries-Induced Evolution

Fisheries-Induced Evolution

(p.100) Chapter Six Fisheries-Induced Evolution
Fish Ecology, Evolution, and Exploitation

Ken H. Andersen

Princeton University Press

This chapter develops a basic evolutionary impact assessment of fishing. It does so by combining the size-based theory developed in chapters 3 and 4 with classic quantitative genetics. The impact assessment estimated the selection responses resulting from size-selective fishing on three main life-history traits: size at maturation, growth rate, and investment in reproduction. The predicted selection responses from a fishing mortality comparable to Fmsy are on the order of magnitude of 0.1 percent per year, smallest for size at maturation and largest for the investment in reproduction. The responses increase roughly proportional to the fishing mortality, so overfishing will not only result in depleted stocks and suboptimal yield production, but it will also lead to faster fisheries-induced evolution.

Keywords:   impact assessment, evolutionary impact assessment, quantitative genetics, size-based theory, size-selective fishing, fisheries management, fisheries-induced evolution, yield production

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