# American Institute of Mathematical Sciences

January  2016, 21(1): 55-65. doi: 10.3934/dcdsb.2016.21.55

## Stochastic PDE model for spatial population growth in random environments

 1 Department of Mathematics, Wayne State University, Detroit, MI 48202

Received  February 2015 Revised  September 2015 Published  November 2015

The paper is concerned with a class of stochastic reaction-diffusion equations arising from a spatial population growth model in random environments. Under some sufficient conditions, Theorem 3.1 shows that the equation has a unique positive global solution in space $H^1(D)$. Then it is proven in Theorem 4.1 that the solution, as the population size, is ultimately bounded in the mean $L^2-$norm as the time tends to infinity. An almost-sure upper bound is also obtained for the long run time-average of the exponential rate of the population growth in $L^2-$norm together with the $L^p-$moment of the population size with $p \geq 2.$ It is also shown in Theorem 4.3 that there is a unique invariant measure that leads to a stationary population distribution. For illustration, an example is given.
Citation: Pao-Liu Chow. Stochastic PDE model for spatial population growth in random environments. Discrete & Continuous Dynamical Systems - B, 2016, 21 (1) : 55-65. doi: 10.3934/dcdsb.2016.21.55
##### References:
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##### References:
 [1] P. Chow, Stochastic Partial Differential Equations,, $2^{nd}$ edition, (2015).   Google Scholar [2] P. Chow, Unbounded positive solutions of nonlinear parabolic Itô equations,, Comm. Stoch. Analy., 3 (2009), 211.   Google Scholar [3] G. Da Prato and J. Zabczyk, Stochastic Equations in Infinite Dimensions,, Cambridge University Press, (1992).  doi: 10.1017/CBO9780511666223.  Google Scholar [4] L. Edelstein-Keshet, Mathematical Models in Biology,, Random House, (1988).   Google Scholar [5] I. Gyöngy, N. V. Krylov and B. L. Rozovskii, On stochastic equations with respect to semimartingales II: Itô formula in Banach spacses,, Stochastics, 6 (1982), 153.   Google Scholar [6] R. Liptser, A strong law of large numbers for local martingales,, Stochastics, 3 (1980), 217.  doi: 10.1080/17442508008833146.  Google Scholar [7] Y. Lou, T. Nagylaki and W. Ni, An introduction to migration, selection PDE models,, Discr. Conti. Dyn. Syst., 33 (2013), 4349.  doi: 10.3934/dcds.2013.33.4349.  Google Scholar [8] X. Mao, S. Sabanis and E. Renshaw, Asymptotic behavier of the sochastic Lotka-Volterra model,, J. Math. Analy. Appl., 287 (2003), 141.  doi: 10.1016/S0022-247X(03)00539-0.  Google Scholar [9] W. Ni, The Mathematics of Diffusion,, CBMS-NSF Regional Conf. Series in Appl. Math., 82 (2011).  doi: 10.1137/1.9781611971972.  Google Scholar [10] B. Øksendal, Stochastic Differential Equations,, Springer, (2003).   Google Scholar [11] E. Pardoux, Stochastic partial differential equations and filtering of diffusion processes,, Stochastics, 3 (1979), 127.  doi: 10.1080/17442507908833142.  Google Scholar [12] J. Smoller, Shock Waves and Reaction-Diffusion Equations,, Springer-Verlag, (1983).   Google Scholar [13] R. Temam, Infinite-Dimensional Dynamical Systems in Mechanics and Physics,, Walter de Gruyter, (1988).  doi: 10.1007/978-1-4684-0313-8.  Google Scholar [14] C. Zhu and G. Yin, On competitive Lotka-Volterra model in random environments,, J. Math. Anal. Appl., 357 (2009), 154.  doi: 10.1016/j.jmaa.2009.03.066.  Google Scholar
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