Detecting environmental impacts on metapopulations of mound spring invertebrates: Assessing an incidence function model

Andrew J. Tyre, Hugh P. Possingham, Darren P. Niejalke

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

We use a stochastic patch occupancy model of invertebrates in the Mound Springs ecosystem of South Australia to assess the ability of incidence function models to detect environmental impacts on metapopulations. We assume that the probability of colonisation decreases with increasing isolation and the probability of extinction is constant across spring vents. We run the models to quasi-equilibrium, and then impose an impact by increasing the local extinction probability. We sample the output at various times pre- and postimpact, and examine the probability of detecting a significant change in population parameters. The incidence function model approach turns out to have little power to detect environmental impacts on metapopulations with small numbers of patches.

Original languageEnglish (US)
Pages (from-to)225-229
Number of pages5
JournalEnvironment International
Volume27
Issue number2-3
DOIs
StatePublished - Jan 1 2001

Keywords

  • Environmental impact
  • Great Artesian Basin
  • Incidence function model
  • Maximum likehood
  • Metapopulation
  • Quasi-equilibrium

ASJC Scopus subject areas

  • Environmental Science(all)

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