学术报告
报告题目: The spread of the invasive alga Codium fragile driven by long-distance dispersal of buoyant propagules
报 告 人： 金瑜 副教授（美国University of Nebraska-Lincoln）
报告时间：2018年7月13日（星期五）上午10：00-11：00
报告地点：数学与统计学院学术报告厅（25教1802楼）
参加人员：教师、研究生、本科生
Abstract：The secondary spread of an invasive species after initial establishment is a major factor in determining its distribution and impacts. In this study we constructed an individual-based model for the spread of the invasive green alga Codium fragile ssp. fragile along a straight coastline, in order to understand the factors governing spreading speed. Codium can spread locally through non-buoyant propagules, while long-distance dispersal depends on the wind-driven dispersal of buoyant fragments. Since fragment buoyancy is determined by light conditions, we first modelled the buoyancy of fragments, yielding a dispersal time dependent on light conditions. We then used this dispersal time, along with empirical wind speeds and directions to calculate a dispersal kernel for fragments. Finally, we incorporated this dispersal kernel into a population growth model including survival rate and fragmentation rate, to calculate a population spreading speed. We obtained the spreading speeds under current environmental conditions along the east coast of Canada and also conducted a sensitivity analysis to investigate the potential influence of environmental shifts associated with climate change on the spread of Codium.
报告人简介： 金瑜，Yu Jin got her Ph.D from Memorial university of Canada. She did post-doctor in Alberta university of Canada.She is now an associate professor in the Department of Mathematics at University of Nebraska-Lincoln in USA. She has research interest in applied mathematics with the main focus on dynamical systems and mathematical biology. Her research work is the conjoining of nonlinear dynamics and biology. This includes the establishment of appropriate mathematical models (mainly ordinary/partial/functional differential equations and difference equations) for phenomena in spatial ecology,
