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

基本信息

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

项目摘要

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 快递 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 这项研究将 (1) 表征湖泊中 UV B 的自然通量，以及 (2) 通过实验操纵自然 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 UV B 辐射衰减的可靠基线数据，2) 提供有关浮游生物群落对 UV B 通量的敏感性和响应的见解，以及 3) 提供有关未来如何增加 UV B 通量的数据。 UV B 可能与其他重要的生态变量相互作用，例如营养限制和捕食。已知 UV B 范围（280 320 nm）的自然紫外线辐射通量对多种植物和动物有害，并且由于平流层臭氧消耗而在全球范围内不断增加。生物体已经通过产生光保护化合物、DNA 光修复和行为回避来对当前的 UV B 水平做出反应。尽管这种反应表明 UV B 是一种强大的生态力量，但人们对 UV B 在群落或生态系统层面的生态学，甚至 UV B 穿透淡水的程度知之甚少。 %%% 在一些湖泊中进行密集实验，并在对众多湖泊进行广泛的比较研究中对 UV B 和其他湖泊学变量进行采样，这将加强我们对 UV B 在淡水生态系统中的作用的理解。 ***