涨落环境中不同随机双稳态竞争时间问题研究  

Time Limitation of Different Stochastic Bistable Switch's Competition in Fluctuated Environment

作　　者：娄春波[1] 欧阳颀[1] 

机构地区：[1]北京大学理论生物中心,北京大学物理学院,北京100871

出　　处：《北京大学学报（自然科学版）》2009年第5期915-918,共4页Acta Scientiarum Naturalium Universitatis Pekinensis

摘　　要：设计了一个试验来验证有关生物体如何适应涨落环境的新进化理论,即当环境变换频率和生物体多表型间跳转的内在频率相等的条件下,生物体的适应度最大的理论结果。在开始试验之前,需要对它的可行性进行理论评估。首先根据生物学试验过程建立一个两种生物体竞争的模型;然后考察环境变化频率、生长或死亡速率等参数对最短竞争时间的影响,找到了最优的竞争策略。在合理的参数条件下,模拟结果发现48小时的竞争时间能够把两个不同的物种区分开。The authors designed an experiment to verify a new evolutionary theory about how the organisms adopted stochastic environment, which deduced that the organisms optimized their switch rate equaling to the frequency of their environments. This paper is to provide some guidance by simulation before implementing the experiment. First, the authors build a simple model based on the practical experiment, then test the affect of some tunable parameters on competition time and find the best competition strategy. Simulation result indicates that 48 hour is enough to distinguish two species with a set of suitable parameters.

关 键 词：涨落环境 双稳态 跳转频率 进化 

分 类 号：Q41[生物学—生理学]