A Micro-Level 'Consumer Approach' to Species Population Dynamics

Thomas Christiaans, Thomas Eichner and Rüdiger Pethig

No 1530, CESifo Working Paper Series from CESifo

Abstract: In this paper we develop a micro ecosystem model whose basic entities are representative organisms which behave as if maximizing their net offspring under constraints. Net offspring is increasing in prey biomass intake, declining in the loss of own biomass to predators and Allee’s Law applies. The organism’s constraint reflects its perception of how scarce its own biomass and the biomass of its prey is. In the short-run periods prices (scarcity indicators) coordinate and determine all biomass transactions and net offspring which directly translates into population growth functions. We are able to explicitly determine these growth functions for a simple food web when specific parametric net offspring functions are chosen in the micro-level ecosystem model. For the case of a single species our model is shown to yield the well-known Verhulst-Pearl logistic growth function. With two species in predator-prey relationship, we derive differential equations whose dynamics are completely characterized and turn out to be similar to the predator-prey model with Michaelis-Menten type functional response. With two species competing for a single resource we find that coexistence is a knife-edge feature confirming Tschirhart’s (2002) result in a different but related model.

Keywords: species; growth; extinction; predator-prey relations; resource competition (search for similar items in EconPapers)
Date: 2005
New Economics Papers: this item is included in nep-mic and nep-res
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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Working Paper: A micro-level ‘consumer approach’ to species population dynamics (2005)
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Persistent link: https://EconPapers.repec.org/RePEc:ces:ceswps:_1530

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