报告人：Celso Grebogi

报告题目：Tipping Point Impacted by Multiplexity in Mutualistic Ecological Networks

报告摘要： From a dynamical point of view, a tipping point presents perhaps the single most significant threat to an ecological system as it can lead to abrupt species extinction on a massive scale. Climate changes leading to parameter drifts can drive various ecological systems towards a tipping point. Uncovering natural and biological mechanisms to mitigate or delay a tipping point is of considerable interest. Focusing on the tipping-point dynamics in ecological mutualistic networks of pollinators and plants constructed from empirical data, I will examine the phenomena of noise-induced collapse and noise-induced recovery aiming at understanding the interplay between transients and stochasticity in high dimensional ecological networks. I will discuss control strategies that delay the extinction and advance the recovery by controlling the decay rate of pollinators, having implications to managing high-dimensional ecological systems. I will unveil a natural mechanism by which the occurrence of tipping points can be impacted by multiplexity that broadly describes the diversity of the species abundances, the complexity of the interspecific relationships, and the topology of linkages in ecological networks. For a double-layer system of pollinators and plants, coupling between the network layers occurs when there is dispersal of pollinator species. Multiplexity emerges as the dispersing species establish their presence in the destination layer and have a simultaneous presence in both. The new mutualistic links induced by the dispersing species with the residence species have fundamental benefits to the well-being of the ecosystem in delaying the tipping point and facilitating species recovery.

报告人简介： Celso Grebogi，巴西科学院院士、第三世界科学院院士、美国物理学会会士、爱丁堡皇家学会会士、英国阿伯丁大学教授、英国阿伯丁大学复杂系统和生物数学研究中心主任，并担任了多个具国际影响力期刊的编委。他主要从事非线性动力学、混沌散射、混沌控制、吸引域突变、复杂网络等方面的工作。在1990年，他与Ott、Yorke发表关于混沌控制（OGY混沌控制）的论文被美国物理学会选为过去50年物理学的里程碑性工作。截止日前，他在Nature、Science、Phys. Rep.、Phys. Rev. Lett.、Phys. Rev. X等国际顶级期刊上发表科研学术论文430余篇，出版学术专著和综述260余册，百余次受邀在国际会议上做大会报告。他在谷歌学术中文章引用次数超过45887次，H值96，单篇文章引用次数超过9000次，被列入引用频次最高的学者名单。

时 间：2023年11月29日（星期三）10:30-12:00

地 点：启翔楼357

邀请人：都琳 教授 范艾利 副教授（数学与统计学院）

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