Colloquium
DATE	2020-10-08　16:10-17:00
PLACE	數學館3174教室
SPEAKER	楊定揮 教授（淡江大學數學系）
TITLE	Some Recent Works on the Dynamics and Traveling Wave Solutions of Non-Monotone Three Species Food Web Models
ABSTRACT	Three species food web models are fundamental building blocks of large scale ecosystems. To clarify the local or global and short-term or long-term behavior of ecosystems, it is essential to understand the interacting dynamics of three species food web models. A monotone ecosystem whose interactions among n-species are all cooperative or competitive (n = 2) have been well studied in the past three decades by the theory of monotone dynamical systems. However, for a non-monotone system whose interactions are blended at least with one consumption (i.e. herbivory, predation or parasitism), most known results are constrained on two species cases since the classical Poincaré-Bendixson Theorem can be applied. Hence recent attention has been attracted to the dynamics of a non-monotone ecosystem with at least three species. In this talk, we will first survey some recent progress on the non-diffusive predator-prey food web models. Then, with diffusion, the existence of traveling wave solutions by upper lower solutions/shooting method are investigated. Finally, some open problems of these topics are proposed. 學者簡介