{"refrec":{"BRefID":10269,"RR":"<b>Elskens, M.; Goeyens, L.; Dehairs, F.A.; Rees, A.; Joint, I.; Baeyens, J.</b> (1999). Improved estimation of f-ratio in natural phytoplankton assemblages. <i>Deep-Sea Res., Part 1, Oceanogr. Res. Pap. 46(10)</i>: 1793-1808","BEntID":10269,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Deep-Sea Res., Part 1, Oceanogr. Res. Pap. 46(10)</i>: 1793-1808","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Elskens, M.; Goeyens, L.; Dehairs, F.A.; Rees, A.; Joint, I.; Baeyens, J.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Elskens, M. <i>et al.</i>","Englishabstract":"Statistical properties in non-linear regression models of <i>f</i>-ratio versus nitrate relationships were investigated using a case study conducted at the European continental margin (Project OMEX). Although the OMEX data fit within the family of empirical models introduced by Platt and Harrison (1985) Nature 318, 55&#x2013;58), it is shown that the discrepancy between experimental and fitted values is larger than expected, assuming that the data are accurate. Since the ambient ammonium concentration plays a leading role in regulating new production, the present analysis was extended to include explicitly the effect of ammonium on <i>f</i>-ratio versus nitrate plots. Experimental results based on controlled ammonium additions were used to express the <i>f</i>-ratio as a function of both nitrate concentration and ammonium inhibition, i.e. <i>f</i><sup>*</sup><sub>(<i>NO</i>3,&#x3b1;)</sub>.<i>I</i><sub>(<i>NH</i>4,&#x3b2;)</sub>. The estimation behaviour of the data set/model combination was analysed by testing the appropriateness of various model functions for <i>f</i><sup>*</sup> and <i>I</i>. The best fit was obtained with a sigmoid curve, for which mean values of the random fluctuation are almost commensurate with the estimated uncertainty of the measurements with natural phytoplankton assemblages. Precision of the <i>f</i>-ratio estimates was further assessed from contour diagrams of constant likelihood. The significance, validity limits of the estimated parameters, and the relevance of the proposed model as a predictive tool are discussed. Overall, this empirically determined model results in improved precision of <i>f</i>-ratio estimations.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Improved estimation of f-ratio in natural phytoplankton assemblages","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":1999,"MonPub":null,"DateUpdate":"2006-07-14","DateCreate":"2001-05-30","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000082560200007","VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":10269,"PubliDate":1999,"Pagination":"1793-1808","XtraPublOfAnaID":null,"ISBN":null,"Volume":"46","Issue":"10","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":45506,"SerRR":"Deep-Sea Research, Part I. 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