Network structure and biodiversity loss in food webs

Robustness increases with connectance

Jennifer A. Dunne, Richard J. Williams, Neo D Martinez

Research output: Contribution to journalArticle

857 Citations (Scopus)

Abstract

Food-web structure mediates dramatic effects of biodiversity loss including secondary and 'cascading' extinctions. We studied these effects by simulating primary species loss in 16 food webs from terrestrial and aquatic ecosystems and measuring robustness in terms of the secondary extinctions that followed. As observed in other networks, food webs are more robust to random removal of species than to selective removal of species with the most trophic links to other species. More surprisingly, robustness increases with food-web connectance but appears independent of species richness and omnivory. In particular, food webs experience 'rivet-like' thresholds past which they display extreme sensitivity to removal of highly connected species. Higher connectance delays the onset of this threshold. Removing species with few trophic connections generally has little effect though there are several striking exceptions. These findings emphasize how the number of species removed affects ecosystems differently depending on the trophic functions of species removed.

Original languageEnglish (US)
Pages (from-to)558-567
Number of pages10
JournalEcology Letters
Volume5
Issue number4
DOIs
StatePublished - 2002
Externally publishedYes

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food webs
food web
biodiversity
extinction
omnivores
omnivory
loss
species diversity
terrestrial ecosystem
aquatic ecosystem
ecosystems
species richness
ecosystem
effect
removal

Keywords

  • Biodiversity
  • Connectance
  • Ecosystem function
  • Food web
  • Network structure
  • Robustness
  • Secondary extinctions
  • Species loss
  • Species richness
  • Topology

ASJC Scopus subject areas

  • Ecology

Cite this

Network structure and biodiversity loss in food webs : Robustness increases with connectance. / Dunne, Jennifer A.; Williams, Richard J.; Martinez, Neo D.

In: Ecology Letters, Vol. 5, No. 4, 2002, p. 558-567.

Research output: Contribution to journalArticle

Dunne, Jennifer A. ; Williams, Richard J. ; Martinez, Neo D. / Network structure and biodiversity loss in food webs : Robustness increases with connectance. In: Ecology Letters. 2002 ; Vol. 5, No. 4. pp. 558-567.
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