{"refrec":{"BRefID":231196,"RR":"<b>Rijkenberg, M.J.A.; Langlois, R.J.; Mills, M.M.; Patey, M.D.; Hill, P.G.; Nielsdottir, M.C.; Compton, T.J.; LaRoche, J.; Achterberg, E.P.</b> (2011). Environmental forcing of nitrogen fixation in the eastern tropical and sub-tropical North Atlantic Ocean. <i>PLoS One 6(12)</i>: e28989. <a href=\"http://dx.doi.org/10.1371/journal.pone.0028989\" target=\"_blank\">dx.doi.org/10.1371/journal.pone.0028989</a>","BEntID":222908,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>PLoS One 6(12)</i>: e28989. <a href=\"https://dx.doi.org/10.1371/journal.pone.0028989\" target=\"_blank\">https://dx.doi.org/10.1371/journal.pone.0028989</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Rijkenberg, M.J.A.; Langlois, R.J.; Mills, M.M.; Patey, M.D.; Hill, P.G.; Nielsdottir, M.C.; Compton, T.J.; LaRoche, J.; Achterberg, E.P.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Rijkenberg, M.J.A. <i>et al.</i>","Englishabstract":"During the winter of 2006 we measured <i>nifH</i> gene abundances, dinitrogen (N<sub>2</sub>) fixation rates and carbon fixation rates in the eastern tropical and sub-tropical North Atlantic Ocean. The dominant diazotrophic phylotypes were filamentous cyanobacteria, which may include <i>Trichodesmium</i> and <i>Katagnymene</i>, with up to 10<sup>6</sup> L<sup>−1</sup> <i>nifH</i> gene copies, unicellular group A cyanobacteria with up to 10<sup>5</sup> L<sup>−1</sup> <i>nifH</i> gene copies and gamma A proteobacteria with up to 10<sup>4</sup> L<sup>−1</sup> <i>nifH</i> gene copies. N<sub>2</sub> fixation rates were low and ranged between 0.032–1.28 nmol N L<sup>−1</sup> d<sup>−1</sup> with a mean of 0.30±0.29 nmol N L<sup>−1</sup> d<sup>−1</sup> (1σ, n = 65). CO<sub>2</sub>-fixation rates, representing primary production, appeared to be nitrogen limited as suggested by low dissolved inorganic nitrogen to phosphate ratios (DIN:DIP) of about 2±3.2 in surface waters. Nevertheless, N<sub>2</sub> fixation rates contributed only 0.55±0.87% (range 0.03–5.24%) of the N required for primary production. Boosted regression trees analysis (BRT) showed that the distribution of the gamma A proteobacteria and filamentous cyanobacteria <i>nifH</i> genes was mainly predicted by the distribution of <i>Prochlorococcus</i>, <i>Synechococcus</i>, picoeukaryotes and heterotrophic bacteria. In addition, BRT indicated that multiple a-biotic environmental variables including nutrients DIN, dissolved organic nitrogen (DON) and DIP, trace metals like dissolved aluminum (DAl), as a proxy of dust inputs, dissolved iron (DFe) and Fe-binding ligands as well as oxygen and temperature influenced N<sub>2</sub> fixation rates and the distribution of the dominant diazotrophic phylotypes. Our results suggest that lower predicted oxygen concentrations and higher temperatures due to climate warming may increase N<sub>2</sub> fixation rates. However, the balance between a decreased supply of DIP and DFe from deep waters as a result of more pronounced stratification and an enhanced supply of these nutrients with a predicted increase in deposition of Saharan dust may ultimately determine the consequences of climate warming for N<sub>2</sub> fixation in the North Atlantic.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Environmental forcing of nitrogen fixation in the eastern tropical and sub-tropical North Atlantic Ocean","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":2011,"MonPub":null,"DateUpdate":"2016-09-23","DateCreate":"2013-12-01","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000298367300037","VABBcode":null,"OpenAcc":1,"DOI":"10.1371/journal.pone.0028989"},"refs":null,"anarec":{"AnaID":231196,"PubliDate":2011,"Pagination":"e28989","XtraPublOfAnaID":null,"ISBN":null,"Volume":"6","Issue":"12","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":123954,"SerRR":"PLoS One. 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