{"refrec":{"BRefID":336711,"RR":"<b>Altabet, M.A.; Bourbonnais, A.</b> (2019). N-loss stoichiometry in a Peru ODZ eddy. <i>J. Mar. Res. 77(2)</i>: 169-189. <a href=\"https://hdl.handle.net/10.1357/002224019828474269\" target=\"_blank\">https://hdl.handle.net/10.1357/002224019828474269</a>","BEntID":333333,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>J. Mar. Res. 77(2)</i>: 169-189. <a href=\"https://hdl.handle.net/10.1357/002224019828474269\" target=\"_blank\">https://hdl.handle.net/10.1357/002224019828474269</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Altabet, M.A.; Bourbonnais, A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Altabet, M.A.; Bourbonnais, A.","Englishabstract":"ssuming heterotrophic denitrification as the dominant microbial process, Richards (1965) formulated a stoichiometry governing nitrogen loss in open-ocean oxygen deficient zones (ODZs). It prescribes the quantitative coupling between the oxidation of organic matter by NO<sup>–</sup><sub>3</sub>in the absence of O<sub>2</sub> and the corresponding production of CO<sub>2</sub>, N<sub>2</sub>, and PO<sup>–3</sup><sub>4</sub>. Applied globally, this relationship defines key linkages between the C, N, and P cycles. However, the validity of Richards's stoichiometry is challengedby recognition of complex microbial N processing in ODZs including anammox as an important pathway and nitrite reoxidation. Whereas Richards's stoichiometry would result in N<sub>2</sub>-N production to NO<sup>–</sup><sub>3</sub> removal rates of 1.17, dominance by anammox with respectto biogenic N<sub>2</sub> production could in theory result in a ratio as high as 2. Ratios with PO<sup>–3</sup><sub>4</sub> production provide an additional constraint on the quantity and composition of respired organic matter. Here we use a mesoscale eddy with extreme N-loss in thePeru ODZ as a \"natural laboratory\" to examine N-loss stoichiometry. Its intense biogeochemical signatures, relatively well-defined timescales, and simplified hydrography allowed for the development of strong co-occurring gradients in NO<sup>–</sup><sub>3</sub>, NO<sup>–</sup><sub>2</sub>,biogenic N<sub>2</sub>, and PO<sup>–3</sup><sub>4</sub>. The production of biogenic N<sub>2</sub> as compared with the removal of NO<sup>–</sup><sub>3</sub> (analyzed either directly or as N deficits) was slightly less than predicted by Richards's stoichiometry and did not at allsupport any \"excess\" biogenic N<sub>2</sub>. PO<sup>–3</sup><sub>4</sub> production, however, was twice the expectation from Richards's stoichiometry suggesting that respired organic matter was P-rich as compared with C:N:P Redfield composition. These results suggest major gaps remainbetween current understanding of microbial N pathways in ODZs and their net biogeochemical output.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"N-loss stoichiometry in a Peru ODZ eddy","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-15 01:33:31.444597","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Isotope, Mesoscale eddy","OtherDescriptors":null,"Notes":null,"AnaPub":2019,"MonPub":null,"DateUpdate":"2021-04-27","DateCreate":"2021-04-27","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000518851400007","VABBcode":null,"OpenAcc":0,"Handle":"10.1357/002224019828474269"},"refs":null,"anarec":{"AnaID":336711,"PubliDate":2019,"Pagination":"169-189","XtraPublOfAnaID":null,"ISBN":null,"Volume":"77","Issue":"2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43078,"SerRR":"Journal of Marine Research. Sears Foundation for Marine Research, Yale University: New Haven, Conn..  ISSN 0022-2402; e-ISSN 1543-9542","StandardTitleSer":"Journal of Marine Research","ISSN":"0022-2402","AbbrevSer":"J. Mar. 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