讲座题目：Why it's better to be blue than green: Investigating the environmental drivers of cyanobacterial harmful algal bloom growth and toxicity in western Lake Erie
主讲人: Dr. Timothy Davis, NOAA, Great Lakes Environmental Research Laboratory (GLERL)
主持人：陈雪初 副教授
开始时间：2016-09-22 14:00
讲座地址：生科辅楼119会议室
主办单位：生态与环境科学学院 科技处
报告人简介：
Dr. Timothy Davis
Dr. Timothy Davis has spent the last 10 years studying the ecology of harmful algal blooms (HABs). Dr. Davis completed his Bachelor's of Science at Southampton College of Long Island University in 2004. He then moved to Stony Brook University where he conducted his dissertation research focusing on understanding the environmental drivers of HABs in the several lakes throughout the northeast USA including Lake Erie and Lake Champlain. After he completed his dissertation in 2009, Dr. Davis moved to Brisbane, Australia to continue his work at the Australian Rivers Institute. He spent the next two years studying the ecology of the toxic HABs that occur in drinking water reservoirs that serve the greater Brisbane population of almost two million people. In 2012, Dr. Davis moved to the Canadian Center for Inland Waters in Burlington, Ontario. For the next year he investigated the water quality and harmful algal bloom issues in Lake Erie, Lake Ontario, Lake Huron and Lake Winnipeg. Dr. Davis currently works for NOAA Great Lakes Environmental Research Laboratory (GLERL) in Ann Arbor, MI. He leads GLERL's HAB monitoring and research program which supports critical NOAA HAB forecasting products and is also an adjunct research scientist at the University of Michigan.
报告摘要：
Lake Erie is once again experiencing intense cyanobacterial harmful algal blooms (CHABs) in the western basin. While it is well known that cultural eutrophication is a primary driver of these phenomena, there is fierce debate over the roles of nitrogen (N) and phosphorus (P) in stimulating the growth and toxicity of CHABs. I will present the results from long-term monitoring, microcosm experiments and advanced genetic techniques. Initial findings indicate that while P is critical for initiating western Lake Erie CHABs, N may be more important for stimulating growth and toxin production. Furthermore, CHABs that form in tributaries such as Sandusky Bay were primarily N limited throughout the bloom season. Finally, metagenomic and eco-transcriptomic results have shed light on why a non-N-fixing cyanobacterium (Planktothrix) can dominate in a chronically N limited system and reveal mechanisms that Microcystis can use to outcompete other phytoplankton during times of P limitation.