"The role of ultraviolet radiation, nutrient stress and temperature in the productivity and dynamics of freshwater phytoplankton communities."

湖泊是我们环境的重要组成部分。它们提供各种服务（饮用水和冷却水、娱乐、鱼类生产等），其中许多服务的质量取决于水中发现的微小藻类（浮游植物）的丰度和类型。反过来，浮游植物对包括养分输入在内的人类干扰也很敏感。湖泊也是大尺度环境变化的重要指标。例如，变化的冰盖、温度和浮游植物是区域气候变化的敏感指标。本提案中的工作旨在提高对气候变化某些方面（特别是太阳紫外线辐射的变化，以及温度的变化）如何影响浮游植物的认识，并为气候变化（以及更多的局部人类影响）对湖泊生态的影响建模和预测提供更好的工具。为此，我们将进一步开发一类敏感的、具有成本效益的浮游植物评估方法，从而大大提高基于科学的环境管理的有效性。这些方法利用浮游植物发出的荧光量来判断它们的丰度、种类组成、健康状况和生产力。我们将使用这些方法来确定UVR如何影响浮游植物，我们如何预测UVR的影响，以及我们如何预测湖泊生态对气候变化和当地影响（如营养投入）的变化。研究结果将为湖泊生产力和水质在气候变化和其他压力下如何变化提供深入的见解，并应增加基于科学的环境管理工具的可用性。

Lakes are an important part of our environment. They provide a variety of services (drinking and cooling water, recreation, fish production, etc.) and the quality of many of those services depends on the abundance and type of microscopic algae (phytoplankton) to be found in the water. The phytoplankton are in turn sensitive to human disturbances, including nutrient inputs. Lakes also serve as important indicators of large scale environmental change. For example, altered ice cover, temperatures and phytoplankton are among the sensitive indicators of regional climate variations. The work in this proposal is intended to provide an improved knowledge of how certain aspects of climate change (especially variations in solar ultraviolet radiation, UVR, but also temperature) affect phytoplankton and to provide better tools for modeling and predicting effects of climate variations (as well as more local human impacts) on lake ecology. To do this, we will further develop a class of sensitive, cost-effective methods for assessing phytoplankton that could greatly increase the effectiveness of science-based environmental management. These methods use the amount of fluorescent light emitted by the phytoplankton to judge their abundance, species composition, health and productivity. We will use these methods to determine how UVR affects phytoplankton, how we can predict impacts of UVR, and how we can predict changes in lake ecology in response to climate variation and local impacts such as nutrient inputs. The results will provide insight into how lake productivity and water quality changes under the pressure of climate variations and other stresses, and should increase the availability of tools for science-based environmental management.