Competitive reversals inside ecological reserves: The role of external habitat degradation

Research output: Contribution to journalArticle

42 Scopus citations

Abstract

Habitat degradation is the slow - and often subtle - deterioration in habitat quality that accompanies human activities through increases in road density, pesticide use, hunting pressure, etc. Such degradation is of particular concern in fragmented habitats where economic or jurisdictional boundaries rather than ecological ones determine the level of exploitation adjoining habitat patches endure. To examine the consequences habitat degradation might have on species interactions, we posited a patch of pristine habitat surrounded by "matrix" habitat whose degradation level was variable. Using a coupled pair of diffusive Lotka-Volterra competition equations with Robin (mixed) boundary conditions, we modeled the dynamics of two competing species inhabiting the pristine patch and incorporated matrix degradation through a tunable "hostility" parameter representing species' mortality rates in the matrix. We found that the numerical range of competition coefficients over which one species is the competitive dominant and the other inferior may grow or shrink as matrix quality deteriorates. In some cases, degradation of the exterior habitat would bring about a complete competitive reversal inside the preserve. This result, wherein a formerly inferior species supplants a formerly dominant one - even inside the "protected" remnant patch itself - has policy implications for both nature reserve design and management of human activities outside park boundaries.

Original languageEnglish (US)
Pages (from-to)491-533
Number of pages43
JournalJournal of Mathematical Biology
Volume37
Issue number6
DOIs
StatePublished - Dec 1998

Keywords

  • Competition
  • Ecological reserves
  • Edge effects
  • Lotka-Volterra
  • Reaction-diffusion

ASJC Scopus subject areas

  • Modeling and Simulation
  • Agricultural and Biological Sciences (miscellaneous)
  • Applied Mathematics

Fingerprint Dive into the research topics of 'Competitive reversals inside ecological reserves: The role of external habitat degradation'. Together they form a unique fingerprint.

  • Cite this