加拿大Alberta大学Wang Hao(王皓)教授学术报告

报告题目: Environmental toxin-mediated predator–prey dynamics

报告人：Wang Hao教授

报告时间：3月14日下午16：00-17:00

报告地点：数计学院4号楼2层225学术报告室

摘要:

To study the impact of environmental toxins on food web, we construct a toxin-mediated predator-prey model that combines both direct and indirect toxic effects on two trophic levels. This work investigates how the balance of the classical predator-prey dynamics changes as a function of environmental toxin levels. While high toxin concentrations are shown to be harmful to both species, possibly leading to extirpation of both species, intermediate toxin concentrations may affect predators disproportionately through biomagnification, leading to reduced abundance of predators and increased abundance of the prey. This counterintuitive effect significantly increases biomass at the lower trophic level. Environmental toxins may also reduce population variability by preventing populations from fluctuating around a coexistence equilibrium. Finally, environmental toxins may induce bistability. Since our toxin-mediated predator–prey model is general, the theory developed here not only provides a foundation for population or community effects of toxicity, but also could help develop management policies to preserve and restore the integrity of contaminated habitats. 

报告人简介：

Wang Hao（王皓），加拿大阿尔伯塔大学数学与统计科学系教授，阿尔伯塔老员工物数学中心核心教授和咨询委员会委员。在生物数学，时滞微分方程和非线性动力学前沿领域做出了非常重要的工作。在Journal of Theoretical Biology，Bulletin of Mathematical Biology，SIAM Journal on Applied Mathematics，Journal of Mathematical Biology，FEMS Microbiology Ecology等顶级杂志发表论文30余篇，并出版多部专著。

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