Composition of Stream Dissolved Organic Matter Across Canadian Forested Ecozones Varies in Three Dimensions Linked to Landscape and Climate
Abstract Dissolved organic matter (DOM) is a key variable influencing aquatic ecosystem processes. The concentration and composition of DOM in streams depend on both the delivery of DOM from terrestrial sources and on aquatic DOM production and degradation. However, there is limited understanding of...
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| Format: | Article |
| Language: | English |
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Wiley
2024-05-01
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| Series: | Water Resources Research |
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| Online Access: | https://doi.org/10.1029/2023WR035196 |
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| author | Julia Orlova Fariba Amiri Alyssa K. Bourgeois Jim M. Buttle Erin Cherlet Chad W. Cuss Kevin J. Devito Monica B. Emelko William C. Floyd David E. Foster Ryan H. S. Hutchins Rob Jamieson Mark S. Johnson Hannah J. McSorley Uldis Silins Suzanne E. Tank Lauren M. Thompson Kara L. Webster Chris H. S. Williams David Olefeldt |
| author_facet | Julia Orlova Fariba Amiri Alyssa K. Bourgeois Jim M. Buttle Erin Cherlet Chad W. Cuss Kevin J. Devito Monica B. Emelko William C. Floyd David E. Foster Ryan H. S. Hutchins Rob Jamieson Mark S. Johnson Hannah J. McSorley Uldis Silins Suzanne E. Tank Lauren M. Thompson Kara L. Webster Chris H. S. Williams David Olefeldt |
| author_sort | Julia Orlova |
| collection | DOAJ |
| description | Abstract Dissolved organic matter (DOM) is a key variable influencing aquatic ecosystem processes. The concentration and composition of DOM in streams depend on both the delivery of DOM from terrestrial sources and on aquatic DOM production and degradation. However, there is limited understanding of the variability of stream DOM composition at continental scales and the influence of landscape characteristics and disturbances on DOM across different regions. We assessed DOM composition in 52 streams at seven research sites across six forested ecozones in Canada in 2019–2022 using 26 indices derived from five analytical approaches: absorbance and fluorescence spectroscopy, liquid chromatography—organic carbon detection, Fourier‐transform ion cyclotron resonance mass spectrometry, and asymmetric flow field‐flow fractionation. Combined analyses showed clear clustering and redundancy across analytical techniques, and indicated that compositional variations were primarily related to three axes of DOM composition: (a) aromaticity, which was greater in low‐relief, wetland‐dominated catchments, (b) oxygenation, which was greater in colder and drier ecozones, and (c) biopolymer content, which was greater in lake‐influenced catchments. Variability in DOM composition among research sites was greater than variability of streams within a site and variability over time within a stream. Forest harvesting and wildfire disturbances had no common influence on DOM composition across research sites, emphasizing the need for regional studies. Our study provides a broad understanding of the variability of stream DOM composition and its associations with landscape and catchment characteristics at a subcontinental scale, and provides key insights for the choice and interpretation of DOM indices from various analytical approaches. |
| format | Article |
| id | doaj-art-87c855938ce04a67bbe2a96bef8698a9 |
| institution | DOAJ |
| issn | 0043-1397 1944-7973 |
| language | English |
| publishDate | 2024-05-01 |
| publisher | Wiley |
| record_format | Article |
| series | Water Resources Research |
| spelling | doaj-art-87c855938ce04a67bbe2a96bef8698a92025-08-20T03:22:21ZengWileyWater Resources Research0043-13971944-79732024-05-01605n/an/a10.1029/2023WR035196Composition of Stream Dissolved Organic Matter Across Canadian Forested Ecozones Varies in Three Dimensions Linked to Landscape and ClimateJulia Orlova0Fariba Amiri1Alyssa K. Bourgeois2Jim M. Buttle3Erin Cherlet4Chad W. Cuss5Kevin J. Devito6Monica B. Emelko7William C. Floyd8David E. Foster9Ryan H. S. Hutchins10Rob Jamieson11Mark S. Johnson12Hannah J. McSorley13Uldis Silins14Suzanne E. Tank15Lauren M. Thompson16Kara L. Webster17Chris H. S. Williams18David Olefeldt19Department of Renewable Resources University of Alberta Edmonton AB CanadaDepartment of Civil & Environmental Engineering University of Waterloo Waterloo ON CanadaDepartment of Biological Sciences University of Alberta Edmonton AB CanadaSchool of the Environment Trent University Peterborough ON CanadaDepartment of Renewable Resources University of Alberta Edmonton AB CanadaDepartment of Renewable Resources University of Alberta Edmonton AB CanadaDepartment of Biological Sciences University of Alberta Edmonton AB CanadaDepartment of Civil & Environmental Engineering University of Waterloo Waterloo ON CanadaCoastal Hydrology Research Lab Vancouver Island University Nanaimo BC CanadaDepartment of Civil and Resource Engineering Dalhousie University Halifax NS CanadaDepartment of Earth and Environmental Sciences University of Waterloo Waterloo ON CanadaDepartment of Civil and Resource Engineering Dalhousie University Halifax NS CanadaInstitute for Resources, Environment, and Sustainability University of British Columbia Vancouver BC CanadaCoastal Hydrology Research Lab Vancouver Island University Nanaimo BC CanadaDepartment of Renewable Resources University of Alberta Edmonton AB CanadaDepartment of Biological Sciences University of Alberta Edmonton AB CanadaDepartment of Renewable Resources University of Alberta Edmonton AB CanadaNatural Resources Canada Sault Ste. Marie ON CanadaMinistry of Water, Land and Resource Stewardship Government of British Columbia Penticton BC CanadaDepartment of Renewable Resources University of Alberta Edmonton AB CanadaAbstract Dissolved organic matter (DOM) is a key variable influencing aquatic ecosystem processes. The concentration and composition of DOM in streams depend on both the delivery of DOM from terrestrial sources and on aquatic DOM production and degradation. However, there is limited understanding of the variability of stream DOM composition at continental scales and the influence of landscape characteristics and disturbances on DOM across different regions. We assessed DOM composition in 52 streams at seven research sites across six forested ecozones in Canada in 2019–2022 using 26 indices derived from five analytical approaches: absorbance and fluorescence spectroscopy, liquid chromatography—organic carbon detection, Fourier‐transform ion cyclotron resonance mass spectrometry, and asymmetric flow field‐flow fractionation. Combined analyses showed clear clustering and redundancy across analytical techniques, and indicated that compositional variations were primarily related to three axes of DOM composition: (a) aromaticity, which was greater in low‐relief, wetland‐dominated catchments, (b) oxygenation, which was greater in colder and drier ecozones, and (c) biopolymer content, which was greater in lake‐influenced catchments. Variability in DOM composition among research sites was greater than variability of streams within a site and variability over time within a stream. Forest harvesting and wildfire disturbances had no common influence on DOM composition across research sites, emphasizing the need for regional studies. Our study provides a broad understanding of the variability of stream DOM composition and its associations with landscape and catchment characteristics at a subcontinental scale, and provides key insights for the choice and interpretation of DOM indices from various analytical approaches.https://doi.org/10.1029/2023WR035196dissolved organic matterheadwater streamswater chemistrylakesPARAFACFT‐ICR‐MS |
| spellingShingle | Julia Orlova Fariba Amiri Alyssa K. Bourgeois Jim M. Buttle Erin Cherlet Chad W. Cuss Kevin J. Devito Monica B. Emelko William C. Floyd David E. Foster Ryan H. S. Hutchins Rob Jamieson Mark S. Johnson Hannah J. McSorley Uldis Silins Suzanne E. Tank Lauren M. Thompson Kara L. Webster Chris H. S. Williams David Olefeldt Composition of Stream Dissolved Organic Matter Across Canadian Forested Ecozones Varies in Three Dimensions Linked to Landscape and Climate Water Resources Research dissolved organic matter headwater streams water chemistry lakes PARAFAC FT‐ICR‐MS |
| title | Composition of Stream Dissolved Organic Matter Across Canadian Forested Ecozones Varies in Three Dimensions Linked to Landscape and Climate |
| title_full | Composition of Stream Dissolved Organic Matter Across Canadian Forested Ecozones Varies in Three Dimensions Linked to Landscape and Climate |
| title_fullStr | Composition of Stream Dissolved Organic Matter Across Canadian Forested Ecozones Varies in Three Dimensions Linked to Landscape and Climate |
| title_full_unstemmed | Composition of Stream Dissolved Organic Matter Across Canadian Forested Ecozones Varies in Three Dimensions Linked to Landscape and Climate |
| title_short | Composition of Stream Dissolved Organic Matter Across Canadian Forested Ecozones Varies in Three Dimensions Linked to Landscape and Climate |
| title_sort | composition of stream dissolved organic matter across canadian forested ecozones varies in three dimensions linked to landscape and climate |
| topic | dissolved organic matter headwater streams water chemistry lakes PARAFAC FT‐ICR‐MS |
| url | https://doi.org/10.1029/2023WR035196 |
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