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Global Stability, Local Stability and Permanence in Model Food Webs

โœ Scribed by XIN CHEN; JOEL E. COHEN


Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
411 KB
Volume
212
Category
Article
ISSN
0022-5193

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โœฆ Synopsis


The dynamical theory of food webs has been based typically on local stability analysis. The relevance of local stability to food web properties has been questioned because local stability holds only in the immediate vicinity of the equilibrium and provides no information about the size of the basin of attraction. Local stability does not guarantee persistence of food webs in stochastic environments. Moreover, local stability excludes more complex dynamics such as periodic and chaotic behaviors, which may allow persistence. Global stability and permanence could be better criteria of community persistence. Our simulation analysis suggests that these three stability measures are qualitatively consistent in that all three predict decreasing stability with increasing complexity. Some new predictions on how stability depends on food web con"gurations are generated here: a consumer}victim link has a smaller e!ect on the probabilities of stability, as measured by all three stability criteria, than a pair of recipient-controlled and donor-controlled links; a recipient-controlled link has a larger e!ect on the probabilities of local stability and permanence than a donor-controlled link, while they have the same e!ect on the probability of global stability; food webs with equal proportions of donor-controlled and recipient-controlled links are less stable than those with di!erent proportions.


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