Collaborative LTREB Proposal: Will increases in dissolved organic matter accelerate a shift in trophic status through anoxia-driven positive feedbacks in an oligotrophic lake?
LTREB 协作提案:溶解有机物的增加是否会通过寡营养湖泊中缺氧驱动的正反馈加速营养状态的转变?
基本信息
- 批准号:1754276
- 负责人:
- 金额:$ 12.64万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2018
- 资助国家:美国
- 起止时间:2018-06-01 至 2023-05-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Lakes provide many services to society, such as clean drinking water and productive fisheries. Many lakes, however, are now experiencing increased input of carbon and nutrients, warming temperatures, and declining ice cover, which may reduce water quality or cause blooms of potentially harmful algae. Specifically, many lakes across the United States are experiencing increased browning due to high loading of organic matter leached from land plants. Browning reduces water clarity and interferes with drinking water management practices. In addition, it can cause other changes that may lead to rapid long-term declines in water quality. This research will test the hypothesis that browning may reduce oxygen concentrations in lakes. Low oxygen can cause nutrient release from lake sediments that may increase algae blooms, leading to lake eutrophication. Understanding the effects of browning will increase knowledge of lake ecosystems, and improve forecasts of how lakes will change as their surrounding environments change. This research will also train graduate and undergraduate students, and will lead to better public understanding of threats to lake water quality.Ecological tipping points are of vital interest as anthropogenic activities rapidly transform natural ecosystems. Changes in dissolved organic matter (DOM) represent one important potential driver of tipping points in aquatic ecosystems. This project will investigate whether increases in terrestrial DOM loading can push clear-water oligotrophic lakes beyond a critical tipping point by stimulating hypolimnetic anoxia and sediment DOM and phosphorus release, which may initiate a positive feedback loop of decreasing water clarity, stronger thermal stratification, and enhanced hypolimnetic anoxia. This feedback loop accelerates ecological change and ultimately may shift lake trophic status toward greener, mesotrophic to eutrophic as well as browner, dystrophic conditions. This project will extend a long-term data set of water quality variables sampled since the late 1980s in two lakes in or near the Lacawac Sanctuary and Biological Field Station, located in northeastern Pennsylvania. Complementing these long-term observations, experiments and modeling will be carried out to understand feedbacks associated with browning and enhancing understanding of broader patterns of change in inland water bodies. The project will support a regional lake monitoring network in Pennsylvania and closely interface with GLEON, the Global Lake Ecological Observatory Network.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
湖泊为社会提供许多服务,如清洁饮用水和生产性渔业。然而,许多湖泊现在正经历着碳和营养物质输入的增加,气温升高,冰盖减少,这可能会降低水质或导致潜在有害藻类的大量繁殖。具体地说,由于从陆地植物中沥滤出的有机物的高负荷,美国各地的许多湖泊正在经历增加的布朗宁。布朗宁降低了水的透明度,并干扰了饮用水管理实践。此外,它还可能引起其他变化,导致水质长期迅速下降。这项研究将检验布朗宁可能降低湖泊中氧浓度的假设。低氧会导致湖泊沉积物中的营养物质释放,这可能会增加藻类水华,导致湖泊富营养化。了解布朗宁的影响将增加对湖泊生态系统的了解,并改善对湖泊如何随着周围环境变化而变化的预测。 这项研究还将培训研究生和本科生,并将导致公众更好地了解对湖泊水质的威胁。生态临界点是至关重要的,因为人类活动迅速改变自然生态系统。溶解有机物(DOM)的变化是水生生态系统临界点的一个重要潜在驱动因素。本项目将调查陆地DOM负荷的增加是否可以推动清水贫营养湖泊超过一个临界临界临界点,刺激hypolimnetic缺氧和沉积物DOM和磷的释放,这可能会启动一个正反馈循环,降低水的透明度,更强的热分层,并增强hypolimnetic缺氧。这种反馈循环加速了生态变化,最终可能使湖泊营养状态向绿色、中营养向富营养以及棕色、营养不良的方向转变。该项目将扩展自20世纪80年代末以来在位于宾夕法尼亚州东北部的Lacawac保护区和生物野外站内或附近的两个湖泊中采样的水质变量的长期数据集。为了补充这些长期观测,将进行实验和建模,以了解与布朗宁有关的反馈,并加强对内陆水体更广泛的变化模式的了解。该项目将支持宾夕法尼亚州的一个区域湖泊监测网络,并与全球湖泊生态观测网络GLEON密切合作。该奖项反映了NSF的法定使命,并通过使用基金会的知识价值和更广泛的影响审查标准进行评估,被认为值得支持。
项目成果
期刊论文数量(26)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Habitat-Mediated Responses of Zooplankton to Decreasing Light in Two Temperate Lakes Undergoing Long-Term Browning
两个经历长期褐变的温带湖泊中浮游动物对光照减弱的栖息地调节反应
- DOI:10.3389/fenvs.2020.00073
- 发表时间:2020
- 期刊:
- 影响因子:4.6
- 作者:Williamson, Craig E.;Overholt, Erin P.;Pilla, Rachel M.;Wilkins, Keiko W.
- 通讯作者:Wilkins, Keiko W.
Attenuation of photosynthetically active radiation and ultraviolet radiation in response to changing dissolved organic carbon in browning lakes: Modeling and parametrization
光合有效辐射和紫外线辐射的衰减响应褐宁湖中溶解有机碳的变化:建模和参数化
- DOI:10.1002/lno.11753
- 发表时间:2021
- 期刊:
- 影响因子:4.5
- 作者:Pilla, Rachel M.;Couture, Raoul‐Marie
- 通讯作者:Couture, Raoul‐Marie
The effects of dissolved organic matter from a native and an invasive plant species on juvenile Daphnia survival and growth
本地和入侵植物物种溶解的有机物对幼年水蚤生存和生长的影响
- DOI:10.1093/plankt/fbaa027
- 发表时间:2020
- 期刊:
- 影响因子:2.1
- 作者:Wilkins, Keiko W;Overholt, Erin;Williamson, Craig
- 通讯作者:Williamson, Craig
Widespread deoxygenation of temperate lakes
- DOI:10.1038/s41586-021-03550-y
- 发表时间:2021-06-03
- 期刊:
- 影响因子:64.8
- 作者:Jane, Stephen F.;Hansen, Gretchen J. A.;Rose, Kevin C.
- 通讯作者:Rose, Kevin C.
Key rules of life and the fading cryosphere: Impacts in alpine lakes and streams
- DOI:10.1111/gcb.15362
- 发表时间:2020-10-19
- 期刊:
- 影响因子:11.6
- 作者:Elser, James J.;Wu, Chenxi;Saros, Jasmine E.
- 通讯作者:Saros, Jasmine E.
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Craig Williamson其他文献
{N‐[(S)‐1‐Phenylethyl]carbamoyl}methylaminium chloride
{N-[(S)-1-苯乙基]氨基甲酰基}甲基氯化铵
- DOI:
- 发表时间:
2005 - 期刊:
- 影响因子:0
- 作者:
Craig Williamson;J. Storey;W. Harrison - 通讯作者:
W. Harrison
Time-Temperature Relationships in Thermal Blister Formation
- DOI:
10.1038/jid.1949.7 - 发表时间:
1949-01-01 - 期刊:
- 影响因子:
- 作者:
Craig Williamson;Jud R. Scholtz - 通讯作者:
Jud R. Scholtz
4,5-Dibromophthalimide forms two centrosymmetric dimers, one linked by C-H...O hydrogen bonds and one by N-H...O hydrogen bonds.
4,5-二溴邻苯二甲酰亚胺形成两种中心对称二聚体,一种通过 C-H...O 氢键连接,一种通过 N-H...O 氢键连接。
- DOI:
10.1107/s0108270107005239 - 发表时间:
2007 - 期刊:
- 影响因子:0
- 作者:
Craig Williamson;W. Harrison - 通讯作者:
W. Harrison
Coping Strategies and Psychosocial Resource Needs Reported by Families of Patients Recovering from Coma in Neurointensive Care Units: Preliminary Findings from a Multicenter Qualitative Study (RP423)
- DOI:
10.1016/j.jpainsymman.2022.04.064 - 发表时间:
2022-06-01 - 期刊:
- 影响因子:
- 作者:
Rina Kubota;Katherine Meurer;Nithyashri Baskaran;Qiang Zhang;Sarah M Bannon;Nathan Fishbein;Kaitlyn Lichstein;Mira Reichman;Paula Popok;Ethan Lester;Melissa Motta;Susanne Muehlschlegel;Michael Reznik;Matthew Jaffa;Claire Creutzfeldt;Corey Fehnel;William Freeman;Craig Williamson;Ana-Maria Vranceanu;David Hwang - 通讯作者:
David Hwang
The Old English Riddles Of The Exeter Book
埃克塞特书的古英语谜语
- DOI:
- 发表时间:
1977 - 期刊:
- 影响因子:0
- 作者:
Craig Williamson - 通讯作者:
Craig Williamson
Craig Williamson的其他文献
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{{ truncateString('Craig Williamson', 18)}}的其他基金
OPUS: CRS Synthesis to add dissolved organic matter to the trophic paradigm: the importance of water transparency in structuring pelagic ecosystems
OPUS:CRS 合成将溶解的有机物添加到营养范式中:水透明度在构建远洋生态系统中的重要性
- 批准号:
1950170 - 财政年份:2020
- 资助金额:
$ 12.64万 - 项目类别:
Standard Grant
RAPID: Assessing Sentinel Responses of Lake Ecosystems to the Rim Wildfire
RAPID:评估湖泊生态系统对边缘野火的哨兵响应
- 批准号:
1360066 - 财政年份:2013
- 资助金额:
$ 12.64万 - 项目类别:
Standard Grant
FSML: A Regional Hub for the EON's at Lacawac Sanctuary
FSML:拉卡瓦克保护区 EON 的区域中心
- 批准号:
1318747 - 财政年份:2013
- 资助金额:
$ 12.64万 - 项目类别:
Standard Grant
IRCEB: Interactive Effects of UV Radiation and Temperature on Pelagic Foodwebs
IRCEB:紫外线辐射和温度对远洋食物网的交互影响
- 批准号:
0552283 - 财政年份:2005
- 资助金额:
$ 12.64万 - 项目类别:
Continuing grant
IRCEB: Interactive Effects of UV Radiation and Temperature on Pelagic Foodwebs
IRCEB:紫外线辐射和温度对远洋食物网的交互影响
- 批准号:
0210972 - 财政年份:2002
- 资助金额:
$ 12.64万 - 项目类别:
Continuing Grant
Collaborative Reasearch: The Impact of UV Radiation on Trophic Interactions in Lakes: Direct and Indirect Effects on Zooplankton Communities
合作研究:紫外线辐射对湖泊营养相互作用的影响:对浮游动物群落的直接和间接影响
- 批准号:
9973938 - 财政年份:1999
- 资助金额:
$ 12.64万 - 项目类别:
Continuing grant
The Role of Ultraviolet Radiation in Structuring Freshwater Zooplankton Communities: Interactions with Predation
紫外线辐射在构造淡水浮游动物群落中的作用:与捕食的相互作用
- 批准号:
9509042 - 财政年份:1995
- 资助金额:
$ 12.64万 - 项目类别:
Continuing grant
U.S.-Argentina: UV-B Radiation and Zooplankton Community Structure across Depth and Elevation Gradients in Lakes in Southern Argentina
美国-阿根廷:阿根廷南部湖泊的 UV-B 辐射和跨深度和高程梯度的浮游动物群落结构
- 批准号:
9314421 - 财政年份:1994
- 资助金额:
$ 12.64万 - 项目类别:
Standard Grant
Impact of UV-B Radiation of Pelagic Freshwater Ecosystems: A Workshop
UV-B 辐射对远洋淡水生态系统的影响:研讨会
- 批准号:
9316534 - 财政年份:1993
- 资助金额:
$ 12.64万 - 项目类别:
Standard Grant
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 - 财政年份:1993
- 资助金额:
$ 12.64万 - 项目类别:
Continuing Grant
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