报告题目：Mechanisms for stable coexistence in an insect community
报告人：郑立飞
报告摘要：In this paper, we formulate a three-species ecological community model consisting of two aphid species (Acyrthosiphon pisum and Megoura viciae) and a specialist parasitoid (Aphidius ervi) that attacks only one of the aphids (A pisum). The model incorporates both density-mediated and traitmediated host-parasitoid interactions. Our analysis shows that the model possesses much richer and more realistic dynamics than earlier models. Our theoretical results reveal a new mechanism for stable coexistence in a three-species community in which any two species alone do not co-exist. More specifically, it is known that, when a predator is introduced into a community of two competing species, if the predator only predates on the strong competitor, it can allow the weak competitor to survive, but may drive the strong competitor to extinction through over-exploitation. We show that if the weak competitor interferes the predation on the strong competitor through trait-mediated indirect effects, then all three species can stably coexist.
报告地点：理学院三楼数学实验室（西侧）
报告时间：2011年12月04日下午3：30
欢迎相关师生届时光临。
组织者：郑立飞（所属研究所：西北农林科技大学理学院应用数学研究所）
理学院
二零一一年十二月二日
