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A Microfoundation of Predator-Prey Dynamics

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Author Info
Thomas Eichner
Rüdiger Pethig ()

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Abstract

Predator-prey relationships account for an important part of all interactions between species. In this paper we provide a microfoundation for such predator-prey relations in a food chain. Basic entities of our analysis are representative organisms of species modelled similar to economic households. With prices as indicators of scarcity, organisms are assumed to behave as if they maximize their net biomass subject to constraints which express the organisms' risk of being preyed upon during predation. Like consumers, organisms face a 'budget constraint' requiring their expenditure on prey biomass not to exceed their revenue from supplying own biomass. Short-run ecosystem equilibria are defined and derived. The net biomass acquired by the representative organism in the short term determines the positive or negative population growth. Moving short-run equilibria constitute the dynamics of the predator-prey relations that are characterized in numerical analysis. The population dynamics derived here turn out to differ significantly from those assumed in the standard Lotka-Volterra model.

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Publisher Info
Paper provided by Universität Siegen, Fachbereich Wirtschaftswissenschaften, Wirtschaftsinformatik und Wirtschaftsrecht in its series Volkswirtschaftliche Diskussionsbeitraege with number 110-03.

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Length: 32 pages
Date of creation: 2003
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Handle: RePEc:sie:siegen:110-03

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

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Related research
Keywords: organism; biomass; species; population; predator-prey dynamics;

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Find related papers by JEL classification:
Q20 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Renewable Resources and Conservation - - - General

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References listed on IDEAS
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
  1. Finnoff, David & Tschirhart, John, 2003. "Harvesting in an eight-species ecosystem," Journal of Environmental Economics and Management, Elsevier, vol. 45(3), pages 589-611, May. [Downloadable!] (restricted)
  2. Thomas Eichner & Rüdiger Pethig, 2003. "The impact of scarcity and abundance in food chains on species population dynamics," Volkswirtschaftliche Diskussionsbeitraege 109-03, Universität Siegen, Fachbereich Wirtschaftswissenschaften, Wirtschaftsinformatik und Wirtschaftsrecht. [Downloadable!]
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(explanations, Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.)

  1. Thomas Christiaans & Thomas Eichner & Rüdiger Pethig, 2005. "A micro-level ‘consumer approach’ to species population dynamics," Volkswirtschaftliche Diskussionsbeitraege 123-05, Universität Siegen, Fachbereich Wirtschaftswissenschaften, Wirtschaftsinformatik und Wirtschaftsrecht. [Downloadable!]
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  2. Thomas Christiaans & Thomas Eichner & Rüdiger Pethig, 2005. "Optimal pest control in agriculture," Volkswirtschaftliche Diskussionsbeitraege 122-05, Universität Siegen, Fachbereich Wirtschaftswissenschaften, Wirtschaftsinformatik und Wirtschaftsrecht. [Downloadable!]
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  3. 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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  4. Thomas Eichner & Rüdiger Pethig, 2004. "Efficient nonanthropocentric nature protection," Volkswirtschaftliche Diskussionsbeitraege 115-04, Universität Siegen, Fachbereich Wirtschaftswissenschaften, Wirtschaftsinformatik und Wirtschaftsrecht. [Downloadable!]
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  5. Thomas Eichner & Rüdiger Pethig, 2004. "Economic Land Use, Ecosystem Services and Microfounded Species Dynamics," CESifo Working Paper Series CESifo Working Paper No. , CESifo Group Munich. [Downloadable!]
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