Regional diversity of complex dissolved organic matter across forested hemiboreal headwater streams

Dissolved organic matter (DOM) from soils enters the aquatic environment via headwater streams. Thereafter, it is gradually transformed, removed by sedimentation, and mineralised. Due to the proximity to the terrestrial source and short water residence time, the extent of transformation is minimal i...

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Autores principales: Hawkes, Jeffrey A., Radoman, Nikola, Bergquist, Jonas, Wallin, Marcus B., Tranvik, Lars J., Löfgren, Stefan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6207752/
https://www.ncbi.nlm.nih.gov/pubmed/30375497
http://dx.doi.org/10.1038/s41598-018-34272-3
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author Hawkes, Jeffrey A.
Radoman, Nikola
Bergquist, Jonas
Wallin, Marcus B.
Tranvik, Lars J.
Löfgren, Stefan
author_facet Hawkes, Jeffrey A.
Radoman, Nikola
Bergquist, Jonas
Wallin, Marcus B.
Tranvik, Lars J.
Löfgren, Stefan
author_sort Hawkes, Jeffrey A.
collection PubMed
description Dissolved organic matter (DOM) from soils enters the aquatic environment via headwater streams. Thereafter, it is gradually transformed, removed by sedimentation, and mineralised. Due to the proximity to the terrestrial source and short water residence time, the extent of transformation is minimal in headwaters. DOM has variable composition across inland waters, but the amount of variability in the terrestrial end member is unknown. This gap in knowledge is crucial considering the potential impact large variability would have on modelling DOM degradation. Here, we used a novel liquid chromatography –mass spectrometry method to characterise DOM in 74 randomly selected, forested headwater streams in an 87,000 km(2) region of southeast Sweden. We found a large degree of sample similarity across this region, with Bray-Curtis dissimilarity values averaging 8.4 ± 3.0% (mean ± SD). The identified variability could be reduced to two principle coordinates, correlating to varying groundwater flow-paths and regional mean temperature. Our results indicate that despite reproducible effects of groundwater geochemistry and climate, the composition of DOM is remarkably similar across catchments already as it leaves the terrestrial environment, rather than becoming homogeneous as different headwaters and sub-catchments mix.
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spelling pubmed-62077522018-11-01 Regional diversity of complex dissolved organic matter across forested hemiboreal headwater streams Hawkes, Jeffrey A. Radoman, Nikola Bergquist, Jonas Wallin, Marcus B. Tranvik, Lars J. Löfgren, Stefan Sci Rep Article Dissolved organic matter (DOM) from soils enters the aquatic environment via headwater streams. Thereafter, it is gradually transformed, removed by sedimentation, and mineralised. Due to the proximity to the terrestrial source and short water residence time, the extent of transformation is minimal in headwaters. DOM has variable composition across inland waters, but the amount of variability in the terrestrial end member is unknown. This gap in knowledge is crucial considering the potential impact large variability would have on modelling DOM degradation. Here, we used a novel liquid chromatography –mass spectrometry method to characterise DOM in 74 randomly selected, forested headwater streams in an 87,000 km(2) region of southeast Sweden. We found a large degree of sample similarity across this region, with Bray-Curtis dissimilarity values averaging 8.4 ± 3.0% (mean ± SD). The identified variability could be reduced to two principle coordinates, correlating to varying groundwater flow-paths and regional mean temperature. Our results indicate that despite reproducible effects of groundwater geochemistry and climate, the composition of DOM is remarkably similar across catchments already as it leaves the terrestrial environment, rather than becoming homogeneous as different headwaters and sub-catchments mix. Nature Publishing Group UK 2018-10-30 /pmc/articles/PMC6207752/ /pubmed/30375497 http://dx.doi.org/10.1038/s41598-018-34272-3 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Hawkes, Jeffrey A.
Radoman, Nikola
Bergquist, Jonas
Wallin, Marcus B.
Tranvik, Lars J.
Löfgren, Stefan
Regional diversity of complex dissolved organic matter across forested hemiboreal headwater streams
title Regional diversity of complex dissolved organic matter across forested hemiboreal headwater streams
title_full Regional diversity of complex dissolved organic matter across forested hemiboreal headwater streams
title_fullStr Regional diversity of complex dissolved organic matter across forested hemiboreal headwater streams
title_full_unstemmed Regional diversity of complex dissolved organic matter across forested hemiboreal headwater streams
title_short Regional diversity of complex dissolved organic matter across forested hemiboreal headwater streams
title_sort regional diversity of complex dissolved organic matter across forested hemiboreal headwater streams
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6207752/
https://www.ncbi.nlm.nih.gov/pubmed/30375497
http://dx.doi.org/10.1038/s41598-018-34272-3
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