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ICES Journal of Marine Science: Journal du Conseil Advance Access published online on February 21, 2009
ICES Journal of Marine Science: Journal du Conseil, doi:10.1093/icesjms/fsp021
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Crown Copyright © 2009. Published by Oxford Journals on behalf of the International Council for the Exploration of the Sea. All rights reserved

A generalization of the three-stage model for advice using the precautionary approach in fisheries, to apply broadly to ecosystem properties and pressures

Jake C. Rice

Department of Fisheries and Oceans, 200 Kent Street, Ottawa, Ontario, Canada K1A 0E6

tel: +1 613 990 0288; fax: +1 613 954 0807; e-mail: Jake.Rice{at}dfo-mpo.gc.ca.

Rice, J. C. 2009. A generalization of the three-stage model for advice using the precautionary approach in fisheries, to apply broadly to ecosystem properties and pressures. – ICES Journal of Marine Science, 66: 000–000.

The six assumptions of the three-stage model for fisheries advice using a precautionary approach are itemized. The general applicability of each is considered for use with any indicator of ecosystem status, or human pressure on the ecosystem indicator, rather than just spawning-stock biomass (SSB) and fishing mortality. The framework is fully generalizable, at least conceptually, without requiring additional assumptions or extensions that are less plausible than the assumptions already made in fisheries applications. However, application of the three-stage framework in fisheries hinges on the existence of some relationship between stock productivity and SSB as the basis for selecting a limit reference point and positioning a precautionary reference point. Three types of relationship can exist in fisheries data, and the framework has strategies for dealing with each. In an ecosystem application, the notion of a relationship between productivity and the amount of an ecosystem feature is sometimes appropriate, but sometimes the response variable may be resilience of the feature to perturbation or its ability to serve some ecosystem function as a function of the extent of the feature. The generalized framework accommodates all three types of response in five functional relationships, each of which can allow locating a candidate limit reference point.

Keywords: ecosystem approach, ecosystem indicators, fisheries, limit reference point, precautionary approach

Received 7 April 2008; accepted 16 December 2008.


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