U.S.-Argentina: UV-B Radiation and Zooplankton Community Structure across Depth and Elevation Gradients in Lakes in Southern Argentina

9314421威廉姆森美国-阿根廷合作科学计划奖将支持利哈伊大学的克雷格·威廉姆森和阿根廷科马休大学的埃斯特班·巴尔塞罗的合作。该项目旨在调查UV-B辐射对安第斯山脉南部高海拔湖泊的影响。平流层臭氧的丧失正在导致全球入射UV-B辐射的增加。对海洋系统的调查表明，自然产生的UV-B辐射通量可能会损害水柱过程。淡水生态系统可能比海洋系统更容易受到UV-B辐射的破坏，但对湖泊中的UV-B辐射所做的工作很少。该项目的目标是模拟湖泊中的UV-B衰减；调查UV-B对叶绿素-磷关系的可能影响；以及检查受UV-B辐射不同影响的湖泊中浮游动物群落的变化。这些研究将补充美国小组对北冰洋湖泊UV-B影响的研究和阿根廷小组对安第斯湖泊的研究。这一结果可能会提高人们对湖泊中UV-B辐射的重要性的理解，并将加强国际合作，以便在未来研究UV-B辐射对环境的影响。***

9314421 Williamson This U.S.-Argentina Cooperative Science Program award will support the collaboration of Craig Williamson of Lehigh University and Esteban Balseiro of the University of Comahue in Argentina. The project aims to investigate the impact of UV-B radiation on high-elevation lakes in the southern Andes. Loss of stratospheric ozone is resulting in global increases in incident UV-B radiation. Investigations of marine systems suggest that naturally occurring fluxes of UV-B radiation can harm water column processes. Freshwater ecosystems may be more predisposed to damage by UV-B radiation than marine systems, yet little work has been done on UV-B radiation in lakes. This project's goals are to model UV-B attenuation in lakes; investigate the possible impact of UV-B on the chlorophyll-phosphorus relationship; and examine shifts in zooplankton communities in lakes differentially affected by UV-B radiation. These studies will complement the U.S. group's research on UV-B impacts in north termperate lakes and the Argentine group's research on Andean lakes. The results are likely to improve understanding of the importance of UV-B radiation in lakes, and will strengthen international collaborations for future studies of the effects of UV-B radiation on the environment. ***