{"refrec":{"BRefID":106451,"RR":"<b>de Bie, M.J.M.; Speksnijder, A.G.C.L.; Kowalchuk, G.A.; Schuurman, T.; Zwart, G.; Stephen, J.R.; Diekmann, O.E.; Laanbroek, H.J.</b> (2001). Shifts in the dominant populations of ammonia-oxidizing ß-subclass proteobacteria along the eutrophic Schelde estuary. <i>Aquat. Microb. Ecol. 23</i>: 225-236. <a href=\"http://dx.doi.org/10.3354/ame023225\" target=\"_blank\">http://dx.doi.org/10.3354/ame023225</a>","BEntID":101341,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Aquat. Microb. Ecol. 23</i>: 225-236. <a href=\"http://dx.doi.org/10.3354/ame023225\" target=\"_blank\">http://dx.doi.org/10.3354/ame023225</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":1,"TerrestrialFlag":0,"Authorstring":"de Bie, M.J.M.; Speksnijder, A.G.C.L.; Kowalchuk, G.A.; Schuurman, T.; Zwart, G.; Stephen, J.R.; Diekmann, O.E.; Laanbroek, H.J.","OrigTitleTranslFlag":0,"Authorstringtrunc":"de Bie, M.J.M. <i>et al.</i>","Englishabstract":"The community structure of ammonia-oxidizing bacteria of the β-subclass Proteobacteria was investigated with respect to environmental gradients along the Schelde, a eutrophic estuary system. A dominance of <i>Nitrosomonas</i>-like sequences was detected using molecular techniques targeting the 16S rRNA gene on 3 separate sampling dates, and different <i>Nitrosomonas</i>-like populations were most dominant at different locations along the estuary. The most frequently detected ammonia oxidizer-like sequences in the freshwater part of the estuary were associated with a sequence cluster previously designated as <i>Nitrosomonas</i< Cluster 6a. This group, which is closely affiliated with the cultured species N. ureae, has previously been detected as the dominant ammonia-oxidizer group in various freshwater systems, and was also the dominant recovered sequence cluster from a contributory, untreated sewage effluent sample. The 16S rDNA recovered from brackish locations further downstream was dominated by a group of novel <i>Nitrosomonas</i>-like sequences. <i<Nitrosospira</i>-like sequences represented only a small minority of those detected for all samples. The shift in dominant ammonia-oxidizer populations occurred in the estuarine region with the sharpest observed gradients in salinity, oxygen, and ammonia. These results provide evidence in support of the differential selection of physiologically distinct <i>Nitrosomonas</i>-like groups according to the environmental gradients encountered along the estuary","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Shifts in the dominant populations of ammonia-oxidizing ß-subclass proteobacteria along the eutrophic Schelde estuary","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-22 01:31:34.961679","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2001,"MonPub":null,"DateUpdate":"2017-02-06","DateCreate":"2006-12-19","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000167636500002","VABBcode":null,"OpenAcc":1,"DOI":"10.3354/ame023225"},"refs":null,"anarec":{"AnaID":106451,"PubliDate":2001,"Pagination":"225-236","XtraPublOfAnaID":null,"ISBN":null,"Volume":"23","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42201,"SerRR":"Aquatic Microbial Ecology. 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