Biodiversity lessens the risk of cascading extinction in model food webs

Biodiversity lessens the risk of cascading extinction in model food webs Due to the complex interactions between species in food webs, the extinction of one species could lead to a cascade of further extinctions and hence cause dramatic changes in species composition and ecosystem processes. We found that the risk of additional species extinction, following the loss of one species in model food webs, decreases with the number of species per functional group. For a given number of species per functional group, the risk of further extinctions is highest when an autotroph is removed and lowest when a top predator is removed. In addition, stability decreases when the distribution of interaction strengths in the webs is changed from equal to skew (few strong and many weak links). We also found that omnivory appears to stabilize model food webs. Our results indicate that high biodiversity may serve as an insurance against radical ecosystem changes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ecology Letters Wiley

Biodiversity lessens the risk of cascading extinction in model food webs

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Publisher
Wiley
Copyright
Blackwell Science Ltd
ISSN
1461-023X
eISSN
1461-0248
DOI
10.1046/j.1461-0248.2000.00130.x
Publisher site
See Article on Publisher Site

Abstract

Due to the complex interactions between species in food webs, the extinction of one species could lead to a cascade of further extinctions and hence cause dramatic changes in species composition and ecosystem processes. We found that the risk of additional species extinction, following the loss of one species in model food webs, decreases with the number of species per functional group. For a given number of species per functional group, the risk of further extinctions is highest when an autotroph is removed and lowest when a top predator is removed. In addition, stability decreases when the distribution of interaction strengths in the webs is changed from equal to skew (few strong and many weak links). We also found that omnivory appears to stabilize model food webs. Our results indicate that high biodiversity may serve as an insurance against radical ecosystem changes.

Journal

Ecology LettersWiley

Published: Mar 1, 2000

References

  • Species redundancy and ecosystem reliability.
    Naeem, Naeem
  • Predation, competition, and prey communities: a review of field experiments.
    Sih, Sih; Crowley, Crowley; McPeek, McPeek; Petranka, Petranka; Strohmeier, Strohmeier
  • Biodiversity and ecological redundancy.
    Walker, Walker
  • Estimates and tests of per capita interaction strength: diet, abundance, and impact of intertidally foraging birds.
    Wootton, Wootton

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