{"refrec":{"BRefID":143693,"RR":"<b>Cook, P.L.M.; van Oevelen, D.; Soetaert, K.; Middelburg, J.J.</b> (2009). Carbon and nitrogen cycling on intertidal mudflats of a temperate Australian estuary: 4. Inverse model analysis and synthesis. <i>Mar. Ecol. Prog. Ser. 394</i>: 35-48. <a href=\"http://dx.doi.org/10.3354/meps08270\" target=\"_blank\">http://dx.doi.org/10.3354/meps08270</a>","BEntID":136865,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Mar. Ecol. Prog. Ser. 394</i>: 35-48. <a href=\"https://dx.doi.org/10.3354/meps08270\" target=\"_blank\">https://dx.doi.org/10.3354/meps08270</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":1,"TerrestrialFlag":0,"Authorstring":"Cook, P.L.M.; van Oevelen, D.; Soetaert, K.; Middelburg, J.J.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Cook, P.L.M. <i>et al.</i>","Englishabstract":"Microphytobenthos (MPB) are recognised as exerting an important controlling influence over C and N flows in euphotic sediments; however, the coupling between these flows remains poorly studied. We undertook an inverse model analysis of C and N fluxes through the microbial compartment on intertidal flats in a temperate estuary. The analysis showed that the trophic balance of the sediment exerted a strong influence on the relative fluxes of C and N through the sediment microbial community. Under increasingly autotrophic conditions (production:respiration &gt;1), the assimilation of C relative to N rose above the cellular C:N ratio of MPB, resulting in increased excretion rates of organic matter by MPB. The C:N ratio of the organic matter excreted was also highly variable, ranging from ~20 (mol:mol) under heterotrophic conditions, and increasing to &gt;50 under autotrophic conditions. The relative fluxes of C and N through bacteria were also significantly affected by the trophic balance of the sediment and the ratio of C:N mineralized by bacteria was significantly higher under autotrophic conditions. Dissolved organic N release by bacteria and uptake by MPB also predominated over inorganic N forms under autotrophic conditions. We conclude that C and N fluxes through shallow euphotic sediments may become significantly decoupled and well above the commonly assumed Redfield ratio and measured cellular C:N ratios of MPB.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Carbon and nitrogen cycling on intertidal mudflats of a temperate Australian estuary: 4. 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