Omnivory can both enhance and dampen perturbations in food webs

Details Omnivory can both enhance and dampen perturbations in food webs Omnivory can both enhance and dampen perturbations in food webs

2009-10-02

arxiv.org/abs/0910.0297v1

Biology

Quantitative Biology

Populations and Evolution

24 pages, 12 figures

Scientific paper

10.1007/s12080-010-0074-0

We investigate how perturbations propagate up and down a food chain with and without self-interaction and omnivory. A source of perturbation is a shift in death rate of a trophic level, and the measure of perturbation is the difference between the perturbed and unperturbed steady state populations. For Lotka-Volterra food chains with linear functional response, we show analytically that both intraspecific competition and intraguild predation can either dampen or enhance the propagation of perturbations, thus stabilizing or destabilizing the food web. The direction of the effect depend on the position of the source of perturbation, as well as on the position of the additional competitive and predatory links . These conclusions are confirmed numerically for a food chain with more realistic Type-II functional response. Our results support the positions of both sides in the long-standing debate on the effect of intraspecific competition and omnivory on the stability of trophic systems.

Affiliated with

Also associated with

No associations

Rating

Omnivory can both enhance and dampen perturbations in food webs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Omnivory can both enhance and dampen perturbations in food webs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Omnivory can both enhance and dampen perturbations in food webs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-25771