Communications in theoretical physics, 2011-05, Vol.55 (5), p.829-834
2011
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Details
- Autor(en) / Beteiligte
- Titel
- Statistical Properties of Multispecies Competition Ecosystems Subjected to Dichotomous Noises
- Ist Teil von
- Communications in theoretical physics, 2011-05, Vol.55 (5), p.829-834
- Ort / Verlag
- IOP Publishing
- Erscheinungsjahr
- 2011
- Quelle
- Alma/SFX Local Collection
- Beschreibungen/Notizen
- We investigate statistical properties of multispecies competition ecosystems subjected to both symmetric and asymmetric dichotomous noises. The expression of the stationary probability distribution function （SPDF） is analytically derived by means of mean-field approximation, and verified by stochastic simulations. The results indicate that： （i） A noise amplitude （a0）, a noise autocorrelation time （τ0） and a noise symmetry parameter （k） all can affect the SPDF; （ii） There is an optimal τ0, which makes the mean value of population density be maximal, near which a transition takes place, i.e., the stationary mean value of species density （（x）st） suddenly falls to a lower constant, （iii） As k decreases, the maximum of （x）xt and the optimal 70 increase. The parameter planes of TO -- a20 and τ0- k for the transition are plotted.