Competition-colonization trade-offs and disturbance effects at multiple scales

Ecology. 2007 Apr;88(4):823-9. doi: 10.1890/06-1117.

Abstract

The competition-colonization trade-off has long been a mechanism explaining patterns of species coexistence and diversity in nonequilibrium systems. It forms one explanation of the intermediate disturbance hypothesis (IDH) for local communities--specifically that diversity should be maximized at intermediate disturbance frequencies, yet only a fraction of empirical studies support IDH predictions. Similarly, this trade-off is also a powerful explanation of coexistence at larger spatial scales. I show, with a microbial experimental system, that the diversity-disturbance relationship is dependent on the relative distribution of species along this trade-off. Here I show that, when species are skewed toward late-successional habits, local diversity declines with disturbance. Yet, despite this trait skew, diversity at scales larger than the patch appears insensitive to the trade-off distribution. Intermediate disturbance frequencies produce the greatest diversity in patch successional stage, thus benefiting the maximum number of species at larger scales.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Biodiversity*
  • Ecosystem*
  • Eukaryota / growth & development*
  • Eukaryota / physiology
  • Models, Biological*
  • Population Dynamics
  • Population Growth
  • Porifera / growth & development*
  • Porifera / physiology
  • Species Specificity
  • Water / parasitology*

Substances

  • Water