主讲人：Celso Grebogi 教授（阿伯丁大学）

题目：TIPPING POINTS IN ECOLOGICAL NETWORKS

时间：2022年03月10日下午16：30

会议ID:（腾讯会议）888-4303-3437

报告摘要：

A variety of complex dynamical systems, ranging from ecosystems and the climate to economic, can exhibit a tipping point at which an abrupt transition to a catastrophic state occurs. I will look at the tipping point dynamics in an ecological network caused by environment degradation. Some of the drivers contributing to environmental degradation are well known: 1) humans are locally transforming and fragmenting the landscape, 2) Adjacent areas still harbouring natural landscape are undergoing changes, 3) Glaciers are melting quickly, and so on. Dynamically, the tipping point is associated with crisis that leads to transient chaos, a dynamical phenomenon in which I and my colleagues identified in 1982. As the environment deteriorates slowly, the sustained dynamics of the system is destroyed and replaced by a chaotic transient, which eventually evolving toward a catastrophic state. A reliable forecasting is difficult because the timing of the tipping point is unpredictable.

Pesticides, parasites, diseases, habitat destruction, global warming are linked to large-scale extinction of wild bees’ species, and other species are in trouble. I will then consider empirical mutualistic networks of pollinators and plants from the real world. These networks exhibit a tipping point as the environment deteriorates at which the population collapses suddenly to zero abundance for all the species. I will investigate the issues of control and recovery associated with the occurrence of tipping point. The control of tipping point strategies has implications to managing high-dimensional ecological systems.

个人简介：

Professor Celso Grebogi is the Sixth Century Chair at King’s College, University of Aberdeen, UK. He is the Founder and Director of the Institute for Complex Systems and Mathematical Biology, whose work in systems biology and complex systems became a leading in UK. He is the Co-founder of the Aberdeen-Lanzhou-Tempe Research Centre, whose work is in the new interdisciplinary field: Relativistic Quantum Chaos. He has been an External Scientific Member (Mitglied) of the Max-Planck-Society since 1998. He is a leading expert in chaotic and complex dynamics, including fractal geometry and complex networks. His research involves bridging the gap between abstract concepts from mathematics and applications in the scientific and social disciplines, engineering, and medicine. He has made a huge impact in the area of control of chaos. The paper on this seminal work was selected by Physical Review Letters as a milestone in the past 50 years. He was awarded the Citation Laureate - Researcher of Nobel Class - in 2016, followed by a Motion to that effect supported by the Scottish Parliament. His scientific accomplishments include over 500 publications and over 450 invited talks.