globalchange  > 气候变化与战略
DOI: 10.1073/pnas.2001376117
论文题名:
Outsized nutrient contributions from small tributaries to a Great Lake
作者: Mooney R.J.; Stanley E.H.; Rosenthal W.C.; Esselman P.C.; Kendall A.D.; McIntyre P.B.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:45
起始页码: 28175
结束页码: 28182
语种: 英语
英文关键词: Tributary | nutrient loads | Laurentian Great Lakes | eutrophication
英文摘要: Excessive nitrogen (N) and phosphorus (P) loading is one of the greatest threats to aquatic ecosystems in the Anthropocene, causing eutrophication of rivers, lakes, and marine coastlines worldwide. For lakes across the United States, eutrophication is driven largely by nonpoint nutrient sources from tributaries that drain surrounding watersheds. Decades of monitoring and regulatory efforts have paid little attention to small tributaries of large water bodies, despite their ubiquity and potential local importance. We used a snapshot of nutrient inputs from nearly all tributaries of Lake Michigan—the world’s fifth largest freshwater lake by volume—to determine how land cover and dams alter nutrient inputs across watershed sizes. Loads, concentrations, stoichiometry (N:P), and bioavailability (percentage dissolved inorganic nutrients) varied by orders of magnitude among tributaries, creating a mosaic of coastal nutrient inputs. The 6 largest of 235 tributaries accounted for ∼70% of the daily N and P delivered to Lake Michigan. However, small tributaries exhibited nutrient loads that were high for their size and biased toward dissolved inorganic forms. Higher bioavailability of nutrients from small watersheds suggests greater potential to fuel algal blooms in coastal areas, especially given the likelihood that their plumes become trapped and then overlap in the nearshore zone. Our findings reveal an underappreciated role that small streams may play in driving coastal eutrophication in large water bodies. Although they represent only a modest proportion of lake-wide loads, expanding nutrient management efforts to address smaller watersheds could reduce the ecological impacts of nutrient loading on valuable nearshore ecosystems. © 2020 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163961
Appears in Collections:气候变化与战略

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作者单位: Mooney, R.J., Center for Limnology, University of Wisconsin–Madison, Madison, WI 53706, United States; Stanley, E.H., Center for Limnology, University of Wisconsin–Madison, Madison, WI 53706, United States; Rosenthal, W.C., Center for Limnology, University of Wisconsin–Madison, Madison, WI 53706, United States, Department of Botany, University of Wyoming, Laramie, WY 82071, United States; Esselman, P.C., Great Lakes Science Center, US Geological Survey, Ann Arbor, MI 48105, United States; Kendall, A.D., Department of Earth and Environmental Sciences, Michigan State University, East Lansing, MI 48824, United States; McIntyre, P.B., Center for Limnology, University of Wisconsin–Madison, Madison, WI 53706, United States, Department of Natural Resources, Cornell University, Ithaca, NY 14853, United States

Recommended Citation:
Mooney R.J.,Stanley E.H.,Rosenthal W.C.,et al. Outsized nutrient contributions from small tributaries to a Great Lake[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(45)
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