摘要
研究了环境污染对Smith系统中种群生存的长期影响,考虑到种群数量的变化对种群个体体内毒素浓度和环境中毒素浓度的影响,对传统的Smith系统进行了修正,并且给出了一些种群弱平均持续生存和绝灭的充分条件．在一定条件下得到了弱平均持续生存与绝灭的阈值．
This paper concentrates on the study of the long-time behavior of population in a Smith＇s system, located in a polluted environment. Considering the effect of the variance of the population on the internal and environmental toxicant concentration, we modify the traditional Smith＇s system, and give some sufficient criteria under which the population will be weakly persistent in the mean or go to extinction, The threshold between weak persistence in the mean and extinction can be established in some case.
出处
《生物数学学报》
CSCD
北大核心
2006年第1期9-17,共9页
Journal of Biomathematics
基金
Project supported by the National Natural Science Foundation of P.R.China (No.10171010)the Key Project on Science and Technology of the Education Ministry of People's Republic of China (No. Key 01061)
关键词
Smith系统
环境污染
持续生存
绝灭
Smith＇s system
Environmental pollution
Persistence
Extinction
