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Population Growth of Small Harmful Rats in Grassland Subjected to Noise |
LIU Xue-Mei1,2;LI Zhi-Bing1;XIE Hui-Zhang1,2; AI Bao-Quan3;CHENG
Xiao-Bo1;LIU Liang-Gang4 |
| 1Department of Physics, Zhongshan University, Guangzhou5102752Department of Physics, South China University of Technology, Guangzhou 5106413School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 5106314Faculty of Information Technology, Macau University of Science and Technology, Macau |
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| Cite this article: |
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LIU Xue-Mei, LI Zhi-Bing, XIE Hui-Zhang et al 2007 Chin. Phys. Lett. 24 2135-2137 |
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Abstract The population growth of small harmful rats in grassland subjected to environment fluctuation has been modelled in a logistic equation. Two correlated random variables responsible to the fluctuation of the genetic factor and the suppression factor are used. A two-peak structure of the steady probability distribution of rate population is observed in the large fluctuation regime of the genetic factor. With the increase of correlation constant λ, the steady probability distribution can change from two peaks to a single peak. The suppression factor μ and its fluctuation also affect the steady
probability distribution and can push it toward a small population.
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| Keywords:
87.15.Ya
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Received: 29 March 2007
Published: 25 June 2007
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