Deleting species from model food webs

Details Deleting species from model food webs Deleting species from model food webs

2004-01-27

arxiv.org/abs/q-bio/0401037v1

Biology

Quantitative Biology

Populations and Evolution

30 pages, 9 figures

Scientific paper

We use food webs generated by a model to investigate the effects of deleting species on other species in the web and on the web as a whole. The model incorporates a realistic population dynamics, adaptive foragers and other features which allow for the construction of model webs which resemble empirical food webs. A large number of simulations were carried out to produce a substantial number of model webs on which deletion experiments could be performed. We deleted each species in four hundred distinct model webs and determined, on average, how many species were eliminated from the web as a result. Typically only a small number of species became extinct; in no instance was the web close to collapse. Next, we examined how the the probability of extinction of a species depended on its relationship with the deleted species. This involved the exploration of the concept of indirect predator and prey species and the extent that the probability of extinction depended on the trophic level of the two species. The effect of deletions on the web itself was studied by searching for keystone species, whose removal caused a major restructuring of the community, and also by looking at the correlation between a number of food web properties (number of species, linkage density, fraction of omnivores, degree of cycling and redundancy) and the stability of the web to deletions. With the exception of redundancy, we found little or no correlation. In particular, we found no evidence that complexity in terms of increased species number or links per species is destabilising.

Affiliated with

Also associated with

No associations

Rating

Deleting species from model 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 Deleting species from model food webs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Deleting species from model food webs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-647498