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dc.date.accessioned2018-08-12T15:53:38Z
dc.date.available2018-08-12T15:53:38Z
dc.date.created2017-05-05T19:10:58Z
dc.date.issued2017
dc.identifier.citationHessen, Dag Olav Andersen, Tom Tominaga, Koji Finstad, Anders Gravbrøt . When soft waters becomes softer; drivers of critically low levels of Ca in Norwegian lakes. Limnology and Oceanography. 2017, 62(1), 289-298
dc.identifier.urihttp://hdl.handle.net/10852/62886
dc.description.abstractIn this study, we analyzed long‐term trends in calcium (Ca) concentrations for 70 Norwegian lakes spanning a broad geographical range and for a wide range of ambient drivers. A striking decline in Ca concentrations was observed during the past 30 yr. The trend was most pronounced in southern, previously acidified localities, while there were weaker and less consistent patterns for central and northern regions. For previously acidified areas, this observed decline in Ca is likely related to base cation depletion or reduced Ca mobilization as a consequence of reduced H2SO4‐deposition. However, lower chloride concentrations, increased runoff and forest density (represented by Normalized Difference Vegetation Index, NDVI) also exerted strong negative impacts on Ca‐concentrations. For lakes with a significant negative trend (n = 34), the average decline was −11.05% per decade, corresponding to −0.023 mg Ca L−1 yr−1. This trend may pull levels of Ca in these already Ca‐deficient poor lakes toward, or below, critically low levels for a range of organisms. A somewhat paradoxical effect of the successful battle against anthropogenic acidification is thus that it may impose an increased Ca‐deficiency of freshwater ecosystems.en_US
dc.languageEN
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleWhen soft waters becomes softer; drivers of critically low levels of Ca in Norwegian lakesen_US
dc.typeJournal articleen_US
dc.creator.authorHessen, Dag Olav
dc.creator.authorAndersen, Tom
dc.creator.authorTominaga, Koji
dc.creator.authorFinstad, Anders Gravbrøt
cristin.unitcode185,15,29,70
cristin.unitnameSeksjon for akvatisk biologi og toksikologi
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1
dc.identifier.cristin1468528
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Limnology and Oceanography&rft.volume=62&rft.spage=289&rft.date=2017
dc.identifier.jtitleLimnology and Oceanography
dc.identifier.volume62
dc.identifier.issue1
dc.identifier.startpage289
dc.identifier.endpage298
dc.identifier.doihttp://dx.doi.org/10.1002/lno.10394
dc.identifier.urnURN:NBN:no-65451
dc.type.documentTidsskriftartikkelen_US
dc.type.peerreviewedPeer reviewed
dc.source.issn0024-3590
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/62886/4/Hessen_et_al-2017-Limnology_and_Oceanography.pdf
dc.type.versionPublishedVersion


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