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| Interactive Effects of Climate Change, Wetlands, and Dissolved Organic Matter on UV Damage to Aquatic Foodwebs | |
| 项目编号 | R829643 |
| Scott D. Bridgham | |
| 项目主持机构 | Purdue University |
| 开始日期 | 2002-06-01 |
| 结束日期 | 2005-06-01 |
| 英文摘要 | Project Research Results Final Report 2004 Progress Report 2003 Progress Report 2002 Progress Report 56 publications for this project 13 journal articles for this project Related Information Research Grants P3: Student Design Competition Research Fellowships Small Business Innovation Research (SBIR) Grantee Research Project Results Search Interactive Effects of Climate Change, Wetlands, and Dissolved Organic Matter on UV Damage to Aquatic Foodwebs EPA Grant Number: R829643 Title: Interactive Effects of Climate Change, Wetlands, and Dissolved Organic Matter on UV Damage to Aquatic Foodwebs Investigators: Bridgham, Scott D. , Johnston, Carol A. , Lamberti, Gary A. , Lodge, David M. , Maurice, Patricia A. , Shmagin, Boris A. Current Investigators: Bridgham, Scott D. , Frost, Paul C , Johnston, Carol A. , Lamberti, Gary A. , Lodge, David M. , Maurice, Patricia A. , Shmagin, Boris A. Institution:University of Oregon , University of Minnesota - Duluth Current Institution:University of Oregon , Natural Resources Research Institute , Trent University , University of Notre Dame EPA Project Officer: Packard, Benjamin H Project Period: June 24, 2002 through June 23, 2005 (Extended to June 23, 2006) Project Amount: $897,307 RFA: Assessing the Consequences of Global Change for Aquatic Ecosystems: Climate, Land Use, and UV Radiation (2001)RFA Text | Recipients Lists Research Category:Global Climate Change ,Ecological Indicators/Assessment/Restoration ,Water ,Ecosystems ,Climate Change Description: Attenuation of ultraviolet (UV) radiation is an exponential function of dissolved organic matter (DOM) concentration, such that UV-B penetration in darkly stained waters is limited to only a few centimeters. At the landscape scale, the strongest correlate of DOM concentrations in aquatic ecosystems is the percentage of wetlands in the watershed. Climate change may reduce DOM concentrations in aquatic ecosystems, thereby exacerbating UV effects, by changing the amount and flowpaths of DOM from upland and wetland ecosystems. We hypothesize that the linkages among wetland area and type, DOM, and climate will be the most important factors determining the amount of UV damage to aquatic ecosystems at the landscape scale. Our objectives are to (1) relate DOM concentration and chemistry in various tributaries of a relatively pristine watershed in the Lake Superior drainage basin (Ontonagon River in northern Michigan) to discharge, wetland and upland landscape characteristics, and stream order via multivariate analysis, (2) determine interactions among UVR intensity and DOM chemistry, photodegradation, photoaggregation, and biodegradation, and (3) determine the response of stream foodwebs to the interactions among UVR intensity and DOM concentration and type.These objectives will be addressed through a combination of landscape and hydrological analyses, extensive sampling of water chemistry throughout the watershed for two years, analysis of the chemistry, photodegradation, and biodegradation of DOM, and experiments quantifying the effects of DOM concentration and source on UV damage to three stream trophic levels.This research will greatly improve risk assessment of global change to aquatic foodwebs through knowledge of the interactive effects of climate change, landscape watershed attributes, and DOM in controlling damage by UV radiation to aquatic ecosystems. We hypothesize that watersheds with substantial wetland area will be much less susceptible to drought-induced reductions in DOM due to climate change, thereby buffering the aquatic biota from UV damage. This knowledge will allow appropriate risk management strategies to reduce the threat of future damage to aquatic ecosystems from global change. |
| 英文关键词 | groundwater;soil;land;global climate;chemical transport;ecological effects;bioavailability;stressor;bacteria;discharge;scaling;terrestrial;environmental chemistry;biology;engineering;ecology;hydrology;geology;limnology;Great Lakes;Midwest;Michigan;MI;EPA Region 5. |
| 学科分类 | 09 - 环境科学;08 - 地球科学 |
| 资助机构 | US-EPA |
| 项目经费 | 897307 |
| 国家 | US |
| 语种 | 英语 |
| 文献类型 | 项目 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/72978 |
| 推荐引用方式 GB/T 7714 | Scott D. Bridgham.Interactive Effects of Climate Change, Wetlands, and Dissolved Organic Matter on UV Damage to Aquatic Foodwebs.2002. |
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