{"refrec":{"BRefID":283783,"RR":"<b>Michiels, C.C.; Darchambeau, F.; Roland, F.A.E.; Morana, C.; Llirós, M.; García-Armisen, T.; Thamdrup, B.; Borges, A.V.; Canfield, D.E.; Servais, P.; Descy, J.-P.; Crowe, S.A.</b> (2017). Iron-dependent nitrogen cycling in a ferruginous lake and the nutrient status of Proterozoic oceans. <i>Nature Geoscience 10(3)</i>: 217-221. <a href=\"https://dx.doi.org/10.1038/ngeo2886\" target=\"_blank\">https://dx.doi.org/10.1038/ngeo2886</a>","BEntID":275802,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Nature Geoscience 10(3)</i>: 217-221. <a href=\"https://dx.doi.org/10.1038/ngeo2886\" target=\"_blank\">https://dx.doi.org/10.1038/ngeo2886</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Michiels, C.C.; Darchambeau, F.; Roland, F.A.E.; Morana, C.; Llirós, M.; García-Armisen, T.; Thamdrup, B.; Borges, A.V.; Canfield, D.E.; Servais, P.; Descy, J.-P.; Crowe, S.A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Michiels, C.C. <i>et al.</i>","Englishabstract":"Nitrogen limitation during the Proterozoic has been inferred from the great expanse of ocean anoxia under low-O<sub>2</sub> atmospheres, which could have promoted NO<sub>3</sub><sup>− </sup>reduction to N<sub>2</sub> and fixed N loss from the ocean. The deep oceans were Fe rich (ferruginous) during much of this time, yet the dynamics of N cycling under such conditions remain entirely conceptual, as analogue environments are rare today. Here we use incubation experiments to show that a modern ferruginous basin, Kabuno Bay in East Africa, supports high rates of NO<sub>3</sub><sup>−</sup> reduction. Although 60% of this NO<sub>3</sub><sup>−</sup> is reduced to N<sub>2</sub> through canonical denitrification, a large fraction (40%) is reduced to NH<sub>4</sub><sup>+</sup>, leading to N retention rather than loss. We also find that NO<sub>3</sub><sup>−</sup> reduction is Fe dependent, demonstrating that such reactions occur in natural ferruginous water columns. Numerical modelling of ferruginous upwelling systems, informed by our results from Kabuno Bay, demonstrates that NO<sub>3</sub><sup>−</sup> reduction to NH<sub>4</sub><sup>+</sup> could have enhanced biological production, fuelling sulfate reduction and the development of mid-water euxinia overlying ferruginous deep oceans. This NO<sub>3</sub><sup>−</sup> reduction to NH<sub>4</sub><sup>+</sup> could also have partly offset a negative feedback on biological production that accompanies oxygenation of the surface ocean. Our results indicate that N loss in ferruginous upwelling systems may not have kept pace with global N fixation at marine phosphorous concentrations (0.04–0.13 μM) indicated by the rock record. We therefore suggest that global marine biological production under ferruginous ocean conditions in the Proterozoic eon may thus have been P not N limited.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Iron-dependent nitrogen cycling in a ferruginous lake and the nutrient status of Proterozoic oceans","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2017,"MonPub":null,"DateUpdate":"2017-05-17","DateCreate":"2017-03-07","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000395791400015","VABBcode":null,"OpenAcc":0,"DOI":"10.1038/ngeo2886"},"refs":null,"anarec":{"AnaID":283783,"PubliDate":2017,"Pagination":"217-221","XtraPublOfAnaID":null,"ISBN":null,"Volume":"10","Issue":"3","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":123796,"SerRR":"Nature Geoscience. 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