Competition and stoichiometry: Coexistence of two predators on one prey

Irakli Loladze, Yang Kuang, James Elser, William F. Fagan

Research output: Contribution to journalArticle

92 Citations (Scopus)

Abstract

The competitive exclusion principle (CEP) states that no equilibrium is possible if n species exploit fewer than n resources. This principle does not appear to hold in nature, where high biodiversity is commonly observed, even in seemingly homogenous habitats. Although various mechanisms, such as spatial heterogeneity or chaotic fluctuations, have been proposed to explain this coexistence, none of them invalidates this principle. Here we evaluate whether principles of ecological stoichiometry can contribute to the stable maintenance of biodiverse communities. Stoichiometric analysis recognizes that each organism is a mixture of multiple chemical elements such as carbon (C), nitrogen (N), and phosphorus (P) that are present in various proportions in organisms. We incorporate these principles into a standard predator-prey model to analyze competition between two predators on one autotrophic prey. The model tracks two essential elements, C and P, in each species. We show that a stable equilibrium is possible with two predators on this single prey. At this equilibrium both predators can be limited by the P content of the prey. The analysis suggests that chemical heterogeneity within and among species provides new mechanisms that can support species coexistence and that may be important in maintaining biodiversity.

Original languageEnglish (US)
Pages (from-to)1-15
Number of pages15
JournalTheoretical Population Biology
Volume65
Issue number1
DOIs
StatePublished - Feb 2004

Fingerprint

Biodiversity
stoichiometry
coexistence
predator
predators
Phosphorus
Ecosystem
Nitrogen
Carbon
Maintenance
biodiversity
chemical elements
competitive exclusion
chemical element
organisms
chemical analysis
new species
phosphorus
carbon
nitrogen

Keywords

  • C:P ratio
  • Competition
  • Consumer-resource
  • Food quality
  • Stoichiometry

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Ecology, Evolution, Behavior and Systematics

Cite this

Competition and stoichiometry : Coexistence of two predators on one prey. / Loladze, Irakli; Kuang, Yang; Elser, James; Fagan, William F.

In: Theoretical Population Biology, Vol. 65, No. 1, 02.2004, p. 1-15.

Research output: Contribution to journalArticle

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