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Fishery Ecosystem Dynamics$
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Michael J. Fogarty and Jeremy S. Collie

Print publication date: 2020

Print ISBN-13: 9780198768937

Published to Oxford Scholarship Online: September 2020

DOI: 10.1093/oso/9780198768937.001.0001

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Production at the Cohort and Population Levels

Production at the Cohort and Population Levels

(p.149) Chapter 9 Production at the Cohort and Population Levels
Fishery Ecosystem Dynamics

Michael J. Fogarty

Jeremy S. Collie

Oxford University Press

The dominant focus on production processes in fisheries science sets it apart from other areas of population ecology in which population numbers are the principal currency for analysis. This chapter extends consideration of individual growth and mortality rates provided in earlier chapters to broaden the context for understanding cohort and population processes. A cohort is a group of organisms born within a given time period (e.g. year). How a fish population will respond to harvesting requires not only accurate accounting of its effective reproductive output but an understanding of the relative importance of compensatory mechanisms operating at different points in the life cycle. Recruitment (the number in a cohort surviving to a specified life stage or age) emerges as a dominant component of production at the population level. A dominant theme in this chapter concerns population regulation as embodied in the recruitment process and the high variability in this process.

Keywords:   cohort, population, reproduction, recruitment, variability, compensatory mechanisms, production

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