Salinity causes widespread restriction of methane emissions from small inland waters

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dc.contributor.authorCynthia Soued
dc.contributor.authorMatthew J. Bogard
dc.contributor.authorKerri Finlay
dc.contributor.authorLauren E. Bortolotti
dc.contributor.authorPeter R. Leavitt
dc.contributor.authorPascal Badiou
dc.contributor.authorSara H. Knox
dc.contributor.authorSydney Jensen
dc.contributor.authorPeka Mueller
dc.contributor.authorSung Ching Lee
dc.contributor.authorDarian Ng
dc.contributor.authorBjörn Wissel
dc.contributor.authorChun Ngai Chan
dc.contributor.authorBryan Page
dc.contributor.authorPaige Kowal
dc.date.accessioned2024-01-29T14:32:34Z
dc.date.available2024-01-29T14:32:34Z
dc.date.issued2024-01-24
dc.description© The Author(s) 2024. 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.
dc.description.abstract<jats:title>Abstract</jats:title><jats:p>Inland waters are one of the largest natural sources of methane (CH<jats:sub>4</jats:sub>), a potent greenhouse gas, but emissions models and estimates were developed for solute-poor ecosystems and may not apply to salt-rich inland waters. Here we combine field surveys and eddy covariance measurements to show that salinity constrains microbial CH<jats:sub>4</jats:sub> cycling through complex mechanisms, restricting aquatic emissions from one of the largest global hardwater regions (the Canadian Prairies). Existing models overestimated CH<jats:sub>4</jats:sub> emissions from ponds and wetlands by up to several orders of magnitude, with discrepancies linked to salinity. While not significant for rivers and larger lakes, salinity interacted with organic matter availability to shape CH<jats:sub>4</jats:sub> patterns in small lentic habitats. We estimate that excluding salinity leads to overestimation of emissions from small Canadian Prairie waterbodies by at least 81% ( ~ 1 Tg yr<jats:sup>−1</jats:sup> CO<jats:sub>2</jats:sub> equivalent), a quantity comparable to other major national emissions sources. Our findings are consistent with patterns in other hardwater landscapes, likely leading to an overestimation of global lentic CH<jats:sub>4</jats:sub> emissions. Widespread salinization of inland waters may impact CH<jats:sub>4</jats:sub> cycling and should be considered in future projections of aquatic emissions.</jats:p>
dc.description.sponsorshipThis study was funded by a MITACS-Accelerate grant with Ducks Unlimited Canada, awarded to C.S. in collaboration with L.E.B. and M.J.B., and a postdoctoral fellowship from the National Scientific and Engineering Research Council (NSERC) to C.S. M.J.B. was funded by awards from the University of Lethbridge, NSERC (RGPIN-2020- 05302), Canada Foundation for Innovation (CFI) and the Canada Research Chairs (CRC) program (CRC-2018-00041). P.R.L. was funded by the CRC and CFI programs, NSERC, the Province of Saskatchewan, and the University of Regina. K.F. was funded by the Government of Saskatchewan (grant no. 200160015) and NSERC. L.E.B. and P.B. were supported by Ducks Unlimited Canada’s Institute for Wetland and Waterfowl Research. P.B. and S.H.K. were funded by the Beef Cattle Research Council, Ag Action Manitoba, an NSERC Alliance grant (ALLRP 555468-20), and S.H.K. was funded by the CRC program and NSERC (RGPIN-2019-04199). B.W. was funded by NSERC and the Sas- katchewan Ministry of Environment Fish and Wildlife Development fund.
dc.identifier.citationSoued, C., Bogard, M.J., Finlay, K. et al. Salinity causes widespread restriction of methane emissions from small inland waters. Nat Commun 15, 717 (2024). https://doi.org/10.1038/s41467-024-44715-3
dc.identifier.doi10.1038/s41467-024-44715-3
dc.identifier.issn2041-1723
dc.identifier.urihttps://hdl.handle.net/10294/16211
dc.language.isoen
dc.publisherSpringer Science and Business Media LLC
dc.relation.ispartofNature Communications
dc.rightsAttribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.titleSalinity causes widespread restriction of methane emissions from small inland waters
dc.typejournal-article
oaire.citation.issue1
oaire.citation.volume15
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