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

基本信息

批准号：
1950170
负责人：
Craig Williamson
金额：
$ 19.83万
依托单位：
Miami University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-06-01 至 2023-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1950170&HistoricalAwards=false
关键词：
OPUS CRS Synthesis add dissolved

项目摘要

Water of higher clarity adds economic, recreational, and other value to lake ecosystems and the services they provide. Yet, lakes worldwide are threatened with decreasing clarity due not only to increased nutrient inputs and subsequent algal growth, but also due to increased dissolved organic matter inputs. Some of the compounds produced during the decomposition of organic matter, which is primarily dead plant material, dissolve in water and turn lake water brown. This process is similar to how a steeping tea bag discolors a clear cup of hot water. Increases in rainfall, which are pronounced in some areas, are increasing the flow of dissolved organic matter into lakes from surrounding land, significantly decreasing water clarity and quality. Dissolved organic matter strongly and selectively absorbs ultraviolet radiation, which would otherwise disinfect surface waters by killing harmful human and wildlife pathogens. Dissolved organic matter also absorbs wavelengths of light that are used by photosynthesis, which is the only source of oxygen in the deep waters of lakes. Decreasing water clarity thus results in the degradation of water quality, a greater risk of pathogen survival in surface waters, and depletion of the oxygen in deeper waters, leading to “dead zones” like those in Lake Erie and the Gulf of Mexico. Through a synthesis of data from over 400 lakes that have been monitored over multiple decades, this project will provide new insights into how dissolved organic matter influences long-term changes in water clarity, and the resulting consequences for lake ecosystems. The effects of dissolved organic matter will be integrated into the conventional paradigm for water clarity, so that models can more accurately predict future consequences of dissolved organic matter inputs for lake ecosystems and the services they provide. The products of this research will be: (1) a unique, comprehensive, fully annotated, and publicly available lake database, (2) a suite of synthesis papers that integrate dissolved organic matter (DOM) and UV into a lake ecosystem model, (3) a broader conceptual model for research and educational purposes, and (4) educational and public outreach for diverse audiences, including undergraduates, lake association members, lake managers, and policymakers.The strong relationship between nutrients and chlorophyll and the classification of lakes along a single axis of lake productivity has been the most central paradigm in lake ecology for decades. However, one of the major changes in lakes in recent decades is up to a doubling or more of DOM, leading to browning of many inland waters in North America, Europe, and beyond. Recent increases in precipitation extremes (drought to flood), and associated browning of lakes, require extension of the traditional paradigm to include DOM and the optical properties of lakes. This project will synthesize the most geographically extensive and site intensive database in existence on ultraviolet radiation (UV), optical properties, and associated limnological survey and experimental data on hundreds of lakes worldwide, and a set of three core study lakes. The synthesis will add a new dimension to the current trophic paradigm for lakes.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.

透明度较高的水可以为湖泊生态系统及其提供的服务增加经济、娱乐和其他价值，然而，世界范围内的湖泊都面临着透明度下降的威胁，这不仅是由于养分输入的增加和随后的藻类生长，而且是由于溶解的有机物的增加。有机物质（主要是死亡的植物物质）分解过程中产生的一些化合物会溶解在水中并使湖水变成棕色，这个过程类似于浸泡茶包使一杯清澈的热水变色。降雨量明显在一些地区，溶解的有机物从周围土地流入湖泊，显着降低了水的透明度和水质。溶解的有机物会强烈且选择性地吸收紫外线辐射，否则会杀死有害的人类和野生动物病原体，从而对地表水进行消毒。有机物还会吸收光合作用所用的光波长，而光合作用是湖泊深水中唯一的氧气来源，从而导致水质恶化、地表水中病原体生存的风险更大。更深水域的氧气耗尽，导致伊利湖和墨西哥湾等“死亡区”。通过综合数十年来监测的 400 多个湖泊的数据，该项目将提供新的见解。溶解有机物影响水体透明度的长期变化，以及由此对湖泊生态系统产生的影响溶解有机物的影响将被纳入水体透明度的范式中，因此传统模型可以更准确地预测溶解有机物的未来后果。湖泊生态系统和服务的投入他们提供的这项研究的产品将是：（1）一个独特的、全面的、完整注释的、公开的湖泊数据库，（2）一套将有机物（DOM）和紫外线溶解到湖泊生态系统模型中的综合论文。，（3）更广泛的研究和教育概念模型，以及（4）针对不同受众的教育和公共宣传，包括本科生、湖泊协会成员、湖泊管理者和政策制定者。营养物和叶绿素与湖泊分类之间的密切关系沿着湖泊生产力的单轴几十年来，湖泊生态学一直是最核心的范式，然而，近几十年来湖泊的主要变化之一是 DOM 增加了一倍或更多，导致北美、欧洲和其他地区的许多内陆水域褐变。最近极端降水量（干旱到洪水）的增加以及相关的湖泊褐变，需要扩展传统范式以包括 DOM 和湖泊的光学特性。该项目将综合现有的地理范围最广、场地最密集的紫外线辐射数据库。（紫外线）、光学特性以及全球数百个湖泊的相关湖泊学调查和实验数据，以及一组三个核心研究湖泊的综合将为当前湖泊的营养范式增添新的维度。该奖项反映了 NSF 的法定使命。通过使用基金会的智力价值和更广泛的影响审查标准进行评估，并被认为值得支持。

项目成果

期刊论文数量（23）

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：
Frontiers in Environmental Science
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.

The success of the Montreal Protocol in mitigating interactive effects of stratospheric ozone depletion and climate change on the environment

DOI：
10.1111/gcb.15841
发表时间：
2021-08-30
期刊：
GLOBAL CHANGE BIOLOGY
影响因子：
11.6
作者：
Barnes, Paul W.;Bornman, Janet F.;Robinson, Sharon A.
通讯作者：
Robinson, Sharon A.

Consequences of changing water clarity on the fish and fisheries of the Laurentian Great Lakes

DOI：
10.1139/cjfas-2020-0376
发表时间：
2021
期刊：
Canadian Journal of Fisheries and Aquatic Sciences
影响因子：
2.4
作者：
D. Bunnell;S. Ludsin;R. Knight;L. Rudstam;C. Williamson;T. Höök;P. Collingsworth;B. Lesht;R. Barbiero;A. Scofield;E. Rutherford;Layne Gaynor;H. Vanderploeg;M. Koops
通讯作者：
D. Bunnell;S. Ludsin;R. Knight;L. Rudstam;C. Williamson;T. Höök;P. Collingsworth;B. Lesht;R. Barbiero;A. Scofield;E. Rutherford;Layne Gaynor;H. Vanderploeg;M. Koops

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