捕食食物链

利用拓扑度的理论给出了具有时变离散时滞的三种群捕食食物链系统正周期解的存在性，得到了时滞的大小对种群的持续生存及系统周期行为的影响。

Finally , by using the method of topological degree , we obtain the existence of positive periodic solution of three species predator-prey system with nonautonomous delay .

模型分析表明，北部湾生态系统的能量流动主要以捕食食物链途径为主，其中无脊椎动物在能量从低级向高层次转换中起关键作用。

The food web in Beibu Gulf ecosystem was dominated by detrital path , and benthic invertebrate played a significant role in transferring energy from detritus to higher trophic levels .

被捕食者成食物链的一类n对种群捕食&被捕食生态系统的稳定性

A kind of stability of the ecology system of " predator-prey " of n pairs of preys forming food chain

这些动植物主体通过捕食关系构成食物链。

Predation relations link these agents to form the food chain .