{"refrec":{"BRefID":250884,"RR":"<b>Eichner, M.; Rost, B.; Kranz, S.A.</b> (2014). Diversity of ocean acidification effects on marine N<sub>2</sub> fixers. <i>J. Exp. Mar. Biol. Ecol. 457</i>: 199-207. <a href=\"http://dx.doi.org/10.1016/j.jembe.2014.04.015\" target=\"_blank\">http://dx.doi.org/10.1016/j.jembe.2014.04.015</a>","BEntID":242579,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>J. Exp. Mar. Biol. Ecol. 457</i>: 199-207. <a href=\"http://dx.doi.org/10.1016/j.jembe.2014.04.015\" target=\"_blank\">http://dx.doi.org/10.1016/j.jembe.2014.04.015</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Eichner, M.; Rost, B.; Kranz, S.A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Eichner, M. <i>et al.</i>","Englishabstract":"Considering the important role of N<sub>2</sub> fixation for primary productivity and CO<sub>2</sub> sequestration, it is crucial to assess the response of diazotrophs to ocean acidification. Previous studies on the genus <em>Trichodesmium</em> suggested a strong sensitivity towards ocean acidification. In view of the large functional diversity in N<sub>2</sub> fixers, the objective of this study was to improve our knowledge of the CO<sub>2</sub> responses of other diazotrophs. To this end, the single-celled <em>Cyanothece sp.</em> and two heterocystous species, <em>Nodularia spumigena</em> and the symbiotic <em>Calothrix rhizosoleniae</em>, were acclimated to two <em>p</em>CO<sub>2</sub> levels (380 vs. 980 µatm). Growth rates, cellular composition (carbon, nitrogen and chlorophyll <em>a</em>) as well as carbon and N<sub>2</sub> fixation rates (<sup>14</sup>C incorporation, acetylene reduction) were measured and compared to literature data on different N<sub>2</sub> fixers. The three species investigated in this study responded differently to elevated <em>p</em>CO<sub>2</sub>, showing enhanced, decreased as well as unaltered growth and production rates. For instance, <em>Cyanothece</em> increased production rates with <em>p</em>CO<sub>2</sub>, which is in line with the general view that N<sub>2</sub> fixers benefit from ocean acidification. Due to lowered growth and production of <em>Nodularia</em>, nitrogen input to the Baltic Sea might decrease in the future. In <em>Calothrix</em>, no significant changes in growth or production could be observed, even though N<sub>2</sub> fixation was stimulated under elevated <em>p</em>CO<sub>2</sub>. Reviewing literature data confirmed a large variability in CO<sub>2</sub> sensitivity across diazotrophs. The contrasting response patterns in our and previous studies were discussed with regard to the carbonate chemistry in the respective natural habitats, the mode of N<sub>2</sub> fixation as well as differences in cellular energy limitation between the species. The group-specific CO<sub>2</sub> sensitivities will impact differently on future biogeochemical cycles of open-ocean environments and systems like the Baltic Sea and should therefore be considered in models estimating climate feedback effects.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Diversity of ocean acidification effects on marine N<sub>2</sub> fixers","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-14 01:31:31.236375","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Calothrix; Nodularia; Symbiotic cyanobacteria","OtherDescriptors":null,"Notes":null,"AnaPub":2014,"MonPub":null,"DateUpdate":"2018-02-13","DateCreate":"2015-11-05","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000337868700024","VABBcode":null,"OpenAcc":1,"DOI":"10.1016/j.jembe.2014.04.015"},"refs":null,"anarec":{"AnaID":250884,"PubliDate":2014,"Pagination":"199-207","XtraPublOfAnaID":null,"ISBN":null,"Volume":"457","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43229,"SerRR":"Journal of Experimental Marine Biology and Ecology. 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