研究了一个有Ⅱ类功能反应的非自治捕一食系统持续性和周期解问题.给出了系统持续生存的充分条件,并且,当系统为周期系统时,得出了系统存在唯一的全局稳定正周期解的充分条件.
A nonautonomous predator-prey system with type-II functional response is studied in this paper. It is proved that the system is permanent under appropriate conditions, Further, if the system is periodic, a set of easily verified sufficient conditions that guarantee the existence, uniqueness and global attractivity of strictly positive periodic solutions are derived.