Ilia Ostrovsky（伊利亚·奥斯特洛夫斯基）：物理因素和过程对水生生态系统功能的影响，以金纳雷特湖为例
报告题目：
The impact of physical factors and processes on the functioning of aquatic ecosystems: Lake Kinneret as a case study
报告日期：
10月8日 下午13:00-15:00
报告地点：海洋B407
报告人简介：
Ilia ostrovsky, 以色列人，以色列海洋与湖沼研究所教授，曾任Scripps 海洋研究所，瑞士联邦水科技研究所(EAWAG)等多所著名机构客座教授，是美国海洋湖沼学会，国际水协会等国际知名学术协会荣誉会员。研究兴趣涉及物理生物地球化学耦合过程，水生生态系统研究，温室气体排放，渔业声学等多个领域。在Science of the total environment，RSER，Limnology and Oceanography等生态学和海洋学主流期刊发表多篇论文，并在多个知名国际期刊担任Editorial board职位。
报告内容：
In this presentation, I will discuss the role of various physical phenomena in the formation of the biogeochemical processes in aquatic ecosystems, using the latest investigations on Lake Kinneret. We showed that the basin-scale internal seiches may induce strong diapycnal mixing in the stratified water column. The strongest mixing occurs in proximity to the lake periphery. Such a mixing induces upward nutrient transport to the upper euphotic zone and can essentially enlarge primary productivity at the lake periphery, where organisms of the higher trophic levels (zooplankton and planktivorous fish) are concentrated. The internal seiche-induced resuspension transports the bottom particulate material toward the lake interior (pelagic zone) via the benthic boundary layer and metalimnetic jets. Such a transport induces lateral heterogeneity in sedimentation processes and focuses the light organic-rich particles in the deep lake areas. The organic-rich particles accumulated in the hypolimnetic anoxic sediments play an important role in the production of biogenic methane (a highly potent greenhouse gas), which is efficiently delivered to the atmosphere via gas ebullition. I will also discuss the impact of vertical turbulent mixing and diurnal stratification in the formation of blooms of toxic cyanobacterium Microcystis sp. Further, I will illustrate the short- and long-term effects of water level fluctuations on the reproduction and formation of fish productivity and sustainability of fisheries in subtropical Lake Kinneret. I will also show the importance of the implication of non-destructive remote-sensing technologies for studying fragile aquatic organisms.
海洋生态与环境学院