The Effects of a Recurrent Coastal Plume on the Dynamics and Structure of the Lower Food Web in Lake Michigan

9817805 拉夫连季耶夫 将根据公告进行研究 机会（NSF 97-38）在大海岸研究 湖泊. 这是一个合作研究项目， 来自12个学术和政府研究机构的调查人员 机构职能体系 该研究正在根据 NSF Coastal Ocean Processes（CoOP） NOAA沿海海洋计划 这项合作研究计划的重点是 幕式事件对近岸-近海的重要性 运输和随后的生态后果。研究 试图1）确定什么过程控制生物的跨界（近岸到离岸）运输， 化学和地质材料在沿海边缘 五大湖，并2）开发和测试科学 评估、量化和预测的战略 自然和人为的多重压力的影响， 大 湖泊或选定的沿海次区域。一 污染沉积物与上覆岩层的紧密耦合 水存在于湖泊和沿海生态系统中， 沉积物再悬浮过程。卫星观测 密歇根湖说明了每年反复发作的 近岸-近海运输，一个10公里宽的 沿沿着延伸超过200公里的再悬浮物质 湖的南岸。初步证据显示 这一偶发事件可能是 密歇根湖的跨界沉积物输送。 这种类型 对地球化学有重要影响的 材料（BIMS），生态系统响应，跨等深线 五大湖的交通。该计划的结果将是 适用于许多沿海地区的类似事件。这 全面的跨学科研究将实施一项 综合观测程序和数值模拟 努力识别、量化和开发预测工具 冬春季再悬浮事件，并评估 这一事件对运输和转化的影响， BIMS和湖泊生态。 研究的这一部分侧重于结构和 丰富的微生物食物网生物之前，期间， 在烟羽形成后，测量 与群落和物种特定放牧率的关系 微型浮游动物内，在边缘，和外面的 羽毛。观察、实验和结果将在 与来自初级生产和 浮游动物吃草实验和其他研究 营养和物理过程来完成一个概念 模型和 为拟议的耦合提供数据 生物/物理模型

9817805 Lavrentyev Research will be undertaken in response to an Announcement of Opportunity (NSF 97-38) for Coastal Studies in the Great Lakes. This is a collaborative research project between investigators from twelve academic and government research institutions. The research is being conducted under the auspices of the NSF Coastal Ocean Processes (CoOP) program and the NOAA Coastal Ocean Program. This collaborative, research program focuses on the importance of episodic events on nearshore-offshore transport and subsequent ecological consequences. The study seeks to 1) determine what processes control the cross- margin (inshore to offshore) transport of biological, chemical, and geological materials in the coastal margins of the Great Lakes, and to 2) develop and test scientific strategies for assessing, quantifying, and predicting the impacts of multiple stresses both natural and anthropogenic, in the Great Lakes or selected coastal sub-regions. A tight coupling between contaminated sediments and overlying water exists in lakes and coastal ecosystems through the process of sediment resuspension. Satellite observations in Lake Michigan illustrate an annually recurrent episode of nearshore-offshore transport, a 10-km wide plume of resuspended material extending over 200 km along the southern shores of the lake. Preliminary evidence indicates that this episodic event may be the major mechanism for cross-margin sediment transport in Lake Michigan. This type of event impacts recycling of biogeochemically important materials (BIMS), ecosystem responses, cross-isobath transport in the Great Lakes. The program results will be applicable to similar events in many coastal areas. This comprehensive, interdisciplinary study will implement an integrated observational program and numerical modeling effort to identify, quantify, and develop prediction tools for the winter-spring resuspension event and to assess the impact of this event on the transport and transformation of BIMS and on lake ecology. This component of the study focuses on structure and abundance of microbial food web organisms before, during, and after plume formation; measure Nitrogen cycling rates in relation to community and species-specific grazing rates of microzooplankton within, at the edge, and outside of the plume. Observations, experiments, and results will be coordinated with those from primary production and zooplankton grazing experiments and other studies of nutrient and physical processes to complete a conceptual model and provide data for the proposed coupled biological/physical model.