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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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(p.59) Chapter Four Demography
Fish Ecology, Evolution, and Exploitation

Ken H. Andersen

Princeton University Press

This chapter shows how the population size spectrum can be calculated using the vital rates of the individuals within the population: the growth rate, the reproduction rate, and the mortality as functions of size. It discusses the physiological mortality at length, and attempts to estimate its value from meta-analyses of mortality and growth rate in fish. In obtaining solutions of the population size spectrum, the chapter follows two parallel tracks: a simplified analytical solution, and a full numerical solution. The analytical solution offers insights into the governing scaling relationships between asymptotic size and population-level measures, such as spawning stock biomass, reproductive output, and lifetime reproductive output. Meanwhile, the numerical solution allows us to explore the effects of size-based fishing in the next chapter.

Keywords:   demography, population size, physiological mortality, metabolic scaling rules, mortality risk, growth rate, community size

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