中文摘要：

囚徒困境博弈是研究生物进化博弈中合作维持机制的一个主要理论框架。空间结构能够促进合作行为的维持。基于集合种群理论建立空间囚徒困境博弈模型,研究了生境丧失对合作和欺骗行为及整个种群动态的影响。结果表明适度的生境丧失有利于合作的维持,并且随着生境丧失的加重,在种群灭绝之前种群数量有一个临时的增加,这说明行为策略的多样性是生物面临多变环境的一种防御机制。

英文摘要：

The Prisoner＇s Dilemma （PD） game is the main theoretical framework in which the maintenance of coopera- tion in biological populations was studied. Spatial structure serves as the key to this dilemma. A model of a spatial PD game under a metapopulation framework was built, and the effects of habitat loss on cooperation and population size were studied. The main results were that, due to moderate habitat loss, the fraction of cooperators in the population was enhanced. Moreover, the population size may undergo a temporary period of prosperity just before extinction even while the habitat loss was increased. These implied that the multi-behavior strategy within a population may be a mechanism to defend against the influences of the changing environment.