报 告 人：Rubao Ji教授& Samuel R. Laney教授

报告时间：2015.10.26上午9:00~11:30

报告题目：

(1) Rubao Ji教授：Polar ecosystem research: from a perspective of phenology

(2) Samuel R. Laney教授：New Insight into Polar Phytoplankton through Automated & Autonomous Technologies

报告地点：教学楼220

主持人：张大海副教授

报告人简介：

Rubao Ji教授在美国伍兹霍尔海洋研究所生物系工作，长期从事海洋生态系统动力学研究，科研方面涉猎广泛，主要研究方向和研究兴趣包括：Coupled biological-physical numerical modeling；Food web dynamics in coastal oceans；Plankton phenology and biogeography；Zooplankton population dynamics；Arctic oceanography and biological production；Metapopulation connectivity。目前在国际顶尖学术期刊上公开发表高水平研究论文20多篇，在国际高水平学术研讨会作报告近50次，更多内容详见：http://www.whoi.edu/sbl/liteSite.do?litesiteid=3051。

SamuelR.Laney教授在美国伍兹霍尔海洋研究所生物系工作。他是海洋浮游植物生态系统方面著名的科学家，同时也是一位优秀的工程师。主要研究方向包括：Polar Research； Phytoplankton& bio-optics under the ice in the Arctic Ocean; High-resolution under-ice surveys using the Nereid Under-ice ROV; Imaging and standard flow cytometry of polar phytoplankton; Cell division in diatoms等。目前在国际顶尖学术期刊上公开发表高水平研究论文20多篇，更多内容请见：http://www.whoi.edu/sbl/liteSite.do?litesiteid=37732。

报告摘要：

(1) Polar ecosystem research: from a perspective of phenology

Organisms in the earth’s polar regions are adapted to the strong seasonality of environmental forcing. A small timing mismatch between biological processes and the environment could potentially have significant consequences for the entire food web.Climate-induced changes in ice coverage and ice retreat timing can potentially affect the timing of primary production, but the spatio-temporal pattern of phenology and potential causality have not been fully examined.Increasingly available satellite datasetsand modelingresults allow us to assessphenology and explore potential mechanisms.Here I will present some of our recent data analysis and modeling results, and review the current status and challenges of polar ecosystem research from a perspective of phenology.I will also assess similarities and differences between the Arctic and Antarctic systems, propose underlying mechanisms for the variability, and discuss potential implications for higher trophic levels in the polar ecosystem.

(2) New Insight into Polar Phytoplankton through Automated & Autonomous Technologies

New autonomous observing technologies are greatly enhancing our ability to measure and monitor important ecosystem properties in and under polar sea ice cover. Two technologies will be presented that are now becoming widely used in assessing polar phytoplankton distributions and ecology: Imaging FlowCytobot (IFCB) and Ice-Tethered Profilers (ITPs). The first is an automated microscopy system that takes digital photographs of nano- and microphytoplankton, for later classification using automated identification. A modified IFCB was developed for the NASA ICESCAPE program and was used in the two ICESCAPE field seasons in the Bering and Chukchi Seas. Results from that study will be presented. The second technology (ITP) was originally developed to perform purely physical observations, but new bio-optical sensor payloads now allow ITPs to monitor vertical distributions of chlorophyll-containing organisms under perennial ice cover, over annual scales. An ITP recently collected the first-ever yearlong, daily time series of the vertical distribution of algal biomass, over a 14 month period above 84° N. These data will be discussed, as will future avenues for both technologies.