{"refrec":{"BRefID":27036,"RR":"<b>De Brabandere, L.; Dehairs, F.A.; Van Damme, S.; Brion, N.; Meire, P.; Daro, N.</b> (2002). d<sup>15</sup>N and d<sup>13</sup>C dynamics of suspended organic matter in freshwater and brackish waters of the Scheldt estuary. <i>J. Sea Res. 48(1)</i>: 1-15. <a href=\"http://dx.doi.org/10.1016/s1385-1101(02)00132-6\" target=\"_blank\">dx.doi.org/10.1016/s1385-1101(02)00132-6</a>","BEntID":27036,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>J. Sea Res. 48(1)</i>: 1-15. <a href=\"https://dx.doi.org/10.1016/s1385-1101(02)00132-6\" target=\"_blank\">https://dx.doi.org/10.1016/s1385-1101(02)00132-6</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":1,"TerrestrialFlag":0,"Authorstring":"De Brabandere, L.; Dehairs, F.A.; Van Damme, S.; Brion, N.; Meire, P.; Daro, N.","OrigTitleTranslFlag":0,"Authorstringtrunc":"De Brabandere, L. <i>et al.</i>","Englishabstract":"Suspended particulate organic matter was sampled monthly between June 1999 and April 2000 in the Scheldt river and estuary to investigate the seasonal and spatial patterns of delta<sup>13</sup>C and delta<sup>15</sup>N signatures. delta<sup>15</sup>N of suspended matter showed large seasonal variation. Minimum values ranged from -0.5 promille in the freshwater zone (spring situation) to +2.3 promille in the mesohaline zone (winter situation). Maximum values (summer situation) ranged from +8.8 promille in the freshwater zone to +12.9 promille in the mesohaline zone. delta<sup>13</sup>C showed less seasonal variation and ranged overall from -31.1 promille in the freshwater zone to -23.7 promille in the mesohaline zone. During the growth season, decrease of delta<sup>13</sup>C and increase of delta<sup>15</sup>N of suspended matter were due to local phytoplanktonic and bacterial biomass. There is strong evidence that the delta<sup>15</sup>N enrichment of suspended matter during the growth season reflects the delta<sup>15</sup>N enrichment of the ambient NH<sub>4</sub><sup>+</sup> pool induced by nitrification and NH<sub>4</sub><sup>+</sup> uptake. Zooplankton in the mesohaline section of the river was consistently enriched in delta<sup>15</sup>N relative to suspended matter but followed its seasonal trend. During summer and autumn the isotopic offset between zooplankton and the suspended particulate organic matter was consistent with a pattern of selective feeding on phytoplankton. During summer, delta<sup>15</sup>N of zooplankton reached a value as high as +25.5 promille, the highest value observed during this study. During spring, present-day delta<sup>15</sup>N of suspended matter in the oligohaline and mesohaline section increased compared to the 1970s, probably because today nitrification, which enriches the NH<sub>4</sub><sup>+</sup> pool in delta<sup>15</sup>N, starts earlier in the season. For summer, the discrepancy between present-day suspended matter delta<sup>15</sup>N values and those observed in the 1970s was even larger, especially in the oligohaline and freshwater reaches, probably as a result of improved O<sub>2</sub> conditions now favouring nitrification. Likewise, the present decreased input of delta<sup>15</sup>N-depleted sewage will enhance delta<sup>15</sup>N enrichment of suspended matter during the growth season.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"d<sup>15</sup>N and d<sup>13</sup>C dynamics of suspended organic matter in freshwater and brackish waters of the Scheldt estuary","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2025-07-02 08:33:14.980000","timezone_type":1,"timezone":"+00:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"d<sup>15</sup>N; d<sup>13</sup>C; NH<sub>4</sub><sup>+</sup>; Zooplankton; Suspended organic matter; Seasonal variation","OtherDescriptors":"d<sup>15</sup>N and d<sup>13</sup>C; NH4+","Notes":null,"AnaPub":2002,"MonPub":null,"DateUpdate":"2018-05-17","DateCreate":"2002-09-11","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000178118100001","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/s1385-1101(02)00132-6"},"refs":null,"anarec":{"AnaID":27036,"PubliDate":2002,"Pagination":"1-15","XtraPublOfAnaID":null,"ISBN":null,"Volume":"48","Issue":"1","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43261,"SerRR":"Journal of Sea Research. 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