The Response of Freshwater Plankton Communities to Natural Levels of Ultraviolet Radiation

淡水浮游生物群落对自然紫外线辐射水平的反应

• 批准号: 9306978
• 负责人: Craig Williamson
• 金额: $ 25万
• 依托单位: Lehigh University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-07-15 至 1996-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9306978&HistoricalAwards=false
• 关键词: Response; Freshwater; Plankton; Communities; Natural

WPC4 2 B P Z Courier 10cpi #| x v x 6 X @ 8 ; X @ HP DeskJet 500 HPDES500.PRS x @ x X , , 0 FX @Courier 10cpi 2 V @ Z F ` ? x x x , v x 6 X @ 8 ; X @ HP DeskJet 500 HPDES500.PRS x @ x X , , 0 FX @ #| x 2 2 This research will (1) characterize natural fluxes of UV B in lakes, and (2) experimentally manipulate natural UV B fluxes to resolve how plankton communities respond to UV B radiation. The results of this research will 1) establish solid baseline data on the attenuation of UV B radiation in freshwater lakes, 2) provide insights into the sensitivity and response of plankton communities to UV B fluxes, and 3) provide data on how future increases in UV B are likely to interact with other important ecological variables such as nutrient limitation and predation. Natural fluxes of ultraviolet radiation in the UV B range (280 320 nm) are known to be harmful to a wide variety of plants and animals and are increasing globally due to stratospheric ozone depletion. Organisms have already responded to current levels of UV B with the production of photoprotective compounds, photorepair of DNA, and behavioral avoidance. Although this response suggests that UV B is a potent ecological force, little is known about the ecology of UV B at the community or ecosystem levels, or even how far UV B penetrates freshwaters. %%% The combination of intensive experimentation in a few lakes, and the sampling of UV B and other limnological variables in a broad comparative study of numerous lakes, will strengthen our understanding of the role of UV B in freshwater ecosystems. ***

WPC4 2 B P Z 10 cpi #|X V x 6 X @ 8 ; X @ HP DeskJet 500 HPDES500.PRS X @ x X，，0 FX @ CPI 10cpi 2 V @ Z F ` ? x x x， V x 6 X @ 8 ; X @ HP DeskJet 500 HPDES500.PRS X @ x X，，0 FX @ #|X 2 2 本研究将（1）描述湖泊中UV B的自然通量，（2）实验性地操纵自然UV B通量以解决浮游生物群落如何响应UV B辐射。 这项研究的结果将：1）建立关于淡水湖泊中紫外线B辐射衰减的可靠基线数据; 2）深入了解浮游生物群落对紫外线B通量的敏感性和反应; 3）提供关于未来紫外线B的增加可能如何与营养限制和捕食等其他重要生态变量相互作用的数据。在紫外线B范围（280 - 320纳米）的紫外线辐射的自然通量已知是有害的各种植物和动物，并在全球范围内增加，由于平流层臭氧消耗。 生物体已经对当前水平的UV B做出了反应，产生了光保护化合物，DNA的光修复和行为回避。 虽然这种反应表明，紫外线B是一个强大的生态力量，很少有人知道紫外线B的生态在社区或生态系统的水平，甚至有多远的紫外线B渗透淡水。在几个湖泊中进行的密集实验，以及在众多湖泊的广泛比较研究中对UV B和其他湖沼学变量进行的采样，将加强我们对UV B在淡水生态系统中的作用的理解。***