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The impact of scarcity and abundance in food chains on species population dynamics

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Author Info
Thomas Eichner
Rüdiger Pethig ()

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Abstract

The population dynamics in a food chains are derived from a sequence of short- run equilibria of an ecosystem where predator species demand prey biomass, supply own biomass to their predators and are assumed to behave as if they maximize net biomass intake. Introducing prices as scarcity indicators for the biomass of each species enables us to determine a short-run ecosystem equilibrium guided by prices. Equilibrium regimes differ with respect to their mix of zero-priced (= abundant) and positive-priced (= scarce) species. The population dynamics turn out to vary with the prevailing equilibrium regime. Our analysis yields a richer and more complex population dynamics than the traditional predator-prey dynamics of the Lotka-Volterra type.

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Publisher Info
Paper provided by Universität Siegen, Fachbereich Wirtschaftswissenschaften, Wirtschaftsinformatik und Wirtschaftsrecht in its series Volkswirtschaftliche Diskussionsbeitraege with number 109-03.

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Length: 38 pages
Date of creation: 2003
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Handle: RePEc:sie:siegen:109-03

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Web page: http://www.uni-siegen.de/fb5/vwl/research/diskussionsbeitraege/

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  1. Thomas Eichner & Rüdiger Pethig, 2007. "Harvesting in an integrated general equilibrium model," Environmental & Resource Economics, European Association of Environmental and Resource Economists, vol. 37(1), pages 233-252, May. [Downloadable!] (restricted)
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  2. Thomas Eichner & Ruediger Pethig, 2003. "A Microfoundation of Predator-Prey Dynamics," CESifo Working Paper Series CESifo Working Paper No. , CESifo Group Munich. [Downloadable!]
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  3. Thomas Eichner & Rüdiger Pethig, 2004. "An analytical foundation of the ratio-dependent predator-prey model," Volkswirtschaftliche Diskussionsbeitraege 117-04, Universität Siegen, Fachbereich Wirtschaftswissenschaften, Wirtschaftsinformatik und Wirtschaftsrecht. [Downloadable!]
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