Harvesting in an Eight Species Ecosystem

51 Pages Posted: 18 Nov 2001

See all articles by David Finnoff

David Finnoff

University of Wyoming

John Tschirhart

University of Wyoming - College of Business - Department of Economics and Finance

Date Written: October 2001

Abstract

The theory for a general equilibrium ecosystem model that can include large number of interacting species is presented. Features include: 1) individual plants and animals are assumed to behave as if they are maximizing their net energy intake, 2) short and long-run equilibriums are obtained, 3) species' population adjustments depend on individual net energies. The theory is applied using simulations of an eight-species Alaskan marine ecosystem for which a "natural" equilibrium is calculated. Humans are introduced by adding a regulated open access fishery that harvests one of the species. Fishing impacts the fish population as well as the populations of other species, including Stellar sea lions, an endangered species. The sensitivity of fish and non-fish species populations to harvesting are calculated.

Keywords: harvesting, ecosystem, multiple species

JEL Classification: Q20, Q22

Suggested Citation

Finnoff, David and Tschirhart, John, Harvesting in an Eight Species Ecosystem (October 2001). Available at SSRN: https://ssrn.com/abstract=291048 or http://dx.doi.org/10.2139/ssrn.291048

David Finnoff

University of Wyoming ( email )

1000 E University Ave
Laramie, WY 82071
United States

John Tschirhart (Contact Author)

University of Wyoming - College of Business - Department of Economics and Finance ( email )

P.O. Box 3985
Laramie, WY 82071-3985
United States
970-498-9876 (Phone)
307-766-5090 (Fax)

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