Response of complex food webs to realistic extinction sequences

U. Thara Srinivasan, Jennifer A. Dunne, John Harte, Neo D. Martinez

Research output: Contribution to journalArticle

108 Scopus citations

Abstract

Although an ecosystem's response to biodiversity loss depends on the order in which species are lost, the extinction sequences generally used to explore such responses in food webs have been ecologically unrealistic. We investigate how several extinction orders affect the minimum number of secondary extinctions expected within pelagic food webs from 34 temperate freshwater lakes. An ecologically plausible extinction order is derived from the geographically nested pattern of species composition among the lakes and is corroborated by species' pH tolerances. Simulations suggest that lake communities are remarkably robust to this realistic extinction order and highly sensitive to the reverse sequence of species loss. This sensitivity is not well explained by the known sensitivity of networks to the loss of highly connected species but appears to be better explained by our observation that trophic specialists preferentially consume widely distributed species at low risk of extinction. Our results highlight an important aspect of community organization that may help to maintain biodiversity amidst changing environments.

Original languageEnglish (US)
Pages (from-to)671-682
Number of pages12
JournalEcology
Volume88
Issue number3
DOIs
StatePublished - Mar 1 2007
Externally publishedYes

Keywords

  • Acidification
  • Adirondack lakes
  • Biodiversity
  • Complex networks
  • Extinction order
  • Food web
  • Lake communities
  • Nestedness
  • Pelagic
  • Random extinctions
  • Robustness
  • Species loss

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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