{"refrec":{"BRefID":231291,"RR":"<b>Hardison, A.K.; Anderson, I.C.; Canuel, E.A.; Tobias, C.R.; Veuger, B.</b> (2011). Carbon and nitrogen dynamics in shallow photic systems: interactions between macroalgae, microalgae, and bacteria. <i>Limnol. Oceanogr. 56(4)</i>: 1489-1503. <a href=\"http://dx.doi.org/10.4319/lo.2011.56.4.1489\" target=\"_blank\">dx.doi.org/10.4319/lo.2011.56.4.1489</a>","BEntID":223003,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Limnol. Oceanogr. 56(4)</i>: 1489-1503. <a href=\"https://dx.doi.org/10.4319/lo.2011.56.4.1489\" target=\"_blank\">https://dx.doi.org/10.4319/lo.2011.56.4.1489</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Hardison, A.K.; Anderson, I.C.; Canuel, E.A.; Tobias, C.R.; Veuger, B.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Hardison, A.K. <i>et al.</i>","Englishabstract":"We tracked carbon (C) and nitrogen (N) uptake into sediments in the presence and absence of benthic macroalgae using dual stable isotope tracers in combination with compound-specific isotope analyses of hydrolyzable amino acids and phospholipid-linked fatty acids to quantify the uptake and retention of C and N within bulk sediments, benthic microalgae (BMA), and heterotrophic bacteria. Stable isotope tracers (as <sup>15</sup>NH<sup>+</sup><sub>4</sub> and H<sup>13</sup>CO<sup>−</sup><sub>3</sub>) were added to mesocosms either via the surface water or pore water for the first 14 d of the 42-d experiment. Macroalgae and sediments exposed to ambient light and dark cycles rapidly took up label from both sources and retained label for at least 4 weeks after isotope additions ended. BMA dominated sediment uptake of <sup>13</sup>C and <sup>15</sup>N, initially accounting for 100% of total uptake. Over time, heterotrophic bacterial uptake became relatively more important, increasing from 0% on day 1 to 20–50% on day 42, indicating a close coupling between BMA and bacterial production. In treatments with macroalgae, sediment <sup>13</sup>C and <sup>15</sup>N uptake was ∼ 40% lower than treatments without macroalgae, likely because of shading of the sediment surface by macroalgae, which decreased BMA production, which in turn decreased bacterial production. Overall, sediments served as a sink for C and N through uptake and retention by the microbial community, but retention was lower in the presence of macroalgae.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Carbon and nitrogen dynamics in shallow photic systems: interactions between macroalgae, microalgae, and bacteria","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":"2016-09-22","DateCreate":"2013-12-01","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000294603400025","VABBcode":null,"OpenAcc":1,"DOI":"10.4319/lo.2011.56.4.1489"},"refs":null,"anarec":{"AnaID":231291,"PubliDate":2011,"Pagination":"1489-1503","XtraPublOfAnaID":null,"ISBN":null,"Volume":"56","Issue":"4","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43511,"SerRR":"Limnology and Oceanography. 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