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Prairie stream nutrient stoichiometry across space and time: Influence of discharge, season, and crop type.

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Title: Prairie stream nutrient stoichiometry across space and time: Influence of discharge, season, and crop type.
Authors: White, Amy B.1 (AUTHOR) a33white@uwaterloo.ca, Brua, Robert B.2 (AUTHOR), Painter, Kristin J.3 (AUTHOR), Jarvie, Helen P.4 (AUTHOR), Yates, Adam G.1 (AUTHOR)
Source: Limnology & Oceanography. Aug2025, Vol. 70 Issue 8, p2284-2298. 15p.
Subjects: Hydrology, Climate change, Freshwater ecology, Land cover, Ecosystem dynamics, Seasonal physiological variations, Crop management, Stoichiometry
Geographic Terms: Red River of the North, Canada
Abstract: Stream water nutrient ratios are often influenced by flow variation and landscape characteristics. However, the influence of these drivers on total and dissolved nutrient ratios remains understudied, especially in prairie ecosystems where hydrologic connectivity between soils and streams exhibits substantial spatial and seasonal variability. Here, we ask how hydrology and land cover drive patterns of nitrogen (N), phosphorus (P), and N : P ratios across streams and rivers draining northern prairie ecosystems. To answer this, we compiled nutrient concentration data for tributaries of the Red River, Manitoba, Canada, to assess seasonal and annual variation in nutrient ratios, as well as the relationship between crop cover, discharge, and ratios, over 1‐yr, 10‐yr, and 30‐yr time spans. Total nitrogen : total phosphorus ratios were near the Redfield mass ratio (N/P = 7.23) across 24 streams in the Red River Valley. By comparison, dissolved inorganic nitrogen : total dissolved phosphorus ratios in these streams were N depleted and generally declined from spring through to autumn. The types of crops grown did not appear to be a consistent influence on nutrient ratios in streams throughout the region. In contrast, stream flows strongly influenced spring and summer nutrient ratios in four tributaries over a 30‐yr period. Specifically, increasing stream flow tended to decrease TN : TP and DIN : TDP in the two eastern tributaries but increase DIN : TDP in the western tributaries. Our findings that nutrient ratios in prairie streams are impacted by seasonality and fluctuating hydrologic conditions suggest that nutrient ratios in Red River tributaries may be impacted by future climate change. [ABSTRACT FROM AUTHOR]
Copyright of Limnology & Oceanography is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
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PubType: Academic Journal
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  Data: Prairie stream nutrient stoichiometry across space and time: Influence of discharge, season, and crop type.
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  Data: <searchLink fieldCode="JN" term="%22Limnology+%26+Oceanography%22">Limnology & Oceanography</searchLink>. Aug2025, Vol. 70 Issue 8, p2284-2298. 15p.
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  Data: <searchLink fieldCode="DE" term="%22Red+River+of+the+North%22">Red River of the North</searchLink><br /><searchLink fieldCode="DE" term="%22Canada%22">Canada</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Stream water nutrient ratios are often influenced by flow variation and landscape characteristics. However, the influence of these drivers on total and dissolved nutrient ratios remains understudied, especially in prairie ecosystems where hydrologic connectivity between soils and streams exhibits substantial spatial and seasonal variability. Here, we ask how hydrology and land cover drive patterns of nitrogen (N), phosphorus (P), and N : P ratios across streams and rivers draining northern prairie ecosystems. To answer this, we compiled nutrient concentration data for tributaries of the Red River, Manitoba, Canada, to assess seasonal and annual variation in nutrient ratios, as well as the relationship between crop cover, discharge, and ratios, over 1‐yr, 10‐yr, and 30‐yr time spans. Total nitrogen : total phosphorus ratios were near the Redfield mass ratio (N/P = 7.23) across 24 streams in the Red River Valley. By comparison, dissolved inorganic nitrogen : total dissolved phosphorus ratios in these streams were N depleted and generally declined from spring through to autumn. The types of crops grown did not appear to be a consistent influence on nutrient ratios in streams throughout the region. In contrast, stream flows strongly influenced spring and summer nutrient ratios in four tributaries over a 30‐yr period. Specifically, increasing stream flow tended to decrease TN : TP and DIN : TDP in the two eastern tributaries but increase DIN : TDP in the western tributaries. Our findings that nutrient ratios in prairie streams are impacted by seasonality and fluctuating hydrologic conditions suggest that nutrient ratios in Red River tributaries may be impacted by future climate change. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Limnology & Oceanography is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1002/lno.70117
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 15
        StartPage: 2284
    Subjects:
      – SubjectFull: Hydrology
        Type: general
      – SubjectFull: Climate change
        Type: general
      – SubjectFull: Freshwater ecology
        Type: general
      – SubjectFull: Land cover
        Type: general
      – SubjectFull: Ecosystem dynamics
        Type: general
      – SubjectFull: Seasonal physiological variations
        Type: general
      – SubjectFull: Crop management
        Type: general
      – SubjectFull: Stoichiometry
        Type: general
      – SubjectFull: Red River of the North
        Type: general
      – SubjectFull: Canada
        Type: general
    Titles:
      – TitleFull: Prairie stream nutrient stoichiometry across space and time: Influence of discharge, season, and crop type.
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              M: 08
              Text: Aug2025
              Type: published
              Y: 2025
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