Statistical Properties of Multispecies Competition Ecosystems Subjected to Dichotomous Noises |
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Authors: | NIE Lin-Ru PENG Jin-Hui MEI Dong-Cheng |
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Institution: | 1.Faculty of Science, Kunming University of Science and Technology, Kunming 650093, China
;2.Faculty of Metallurgy, Kunming University of Science and Technology, Kunming 650093, China
;3.Department of Physics, Yunnan University, Kunming 650091, China |
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Abstract: | 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 bystochastic simulations. The results indicate that: (i) A noiseamplitude (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 (st) suddenly falls to a lower constant; (iii) As k decreases, the maximum of< x>st and the optimal τ0 increase. The parameter planes of τ0-a02 and τ0-k for the transition are plotted. |
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Keywords: | statistical properties multispecies competition dichotomous noise transition |
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