{"refrec":{"BRefID":354079,"RR":"<b>Graniero, L.E.; Gillikin, D.P.; Surge, D.; Kelemen, Z.; Bouillon, S.</b> (2021). Assessing δ<sup>15</sup>N values in the carbonate-bound organic matrix and periostracum of bivalve shells as environmental archives. <i>Palaeogeogr. Palaeoclimatol. Palaeoecol. 564</i>: 110108. <a href=\"https://dx.doi.org/10.1016/j.palaeo.2020.110108\" target=\"_blank\">https://dx.doi.org/10.1016/j.palaeo.2020.110108</a>","BEntID":351792,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Palaeogeogr. Palaeoclimatol. Palaeoecol. 564</i>: 110108. <a href=\"https://dx.doi.org/10.1016/j.palaeo.2020.110108\" target=\"_blank\">https://dx.doi.org/10.1016/j.palaeo.2020.110108</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Graniero, L.E.; Gillikin, D.P.; Surge, D.; Kelemen, Z.; Bouillon, S.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Graniero, L.E. <i>et al.</i>","Englishabstract":"Though previous studies demonstrate the utility of nitrogen and carbon stable isotope ratios (δ<sup>15</sup>N and δ13C, respectively) in bivalve soft tissues as biogeochemical proxies, it is necessary to develop alternative proxies for environmental reconstructions when soft tissues are unavailable, such as with fossils or in museum-archived specimens. This study assesses the reliability of the δ<sup>15</sup>N values of carbonate-bound organic matrix (δ<sup>15</sup>N<sub>CBOM</sub>) and periostracum (δ<sup>15</sup>N<sub>periostracum</sub>) in bivalve shells as recorders of the δ<sup>15</sup>N values of particulate nitrogen (δ<sup>15</sup>N<sub>PN</sub>) by comparing the δ<sup>15</sup>N<sub>CBOM</sub> and δ<sup>15</sup>N<sub>periostracum</sub> values of live-collected freshwater mussels (<i>Elliptio complanata</i>) and estuarine clams (<i>Rangia cuneata</i>) to the δ<sup>15</sup>N values of particulate nitrogen (δ<sup>15</sup>N<sub>PN</sub>) in the water column. The δ<sup>15</sup>N<sub>CBOM</sub> and δ<sup>15</sup>N<sub>periostracum</sub> values in both species were within the range of the δ<sup>15</sup>N<sub>PN</sub> values that have been corrected for trophic-level enrichment. Thus, our findings illustrate that δ<sup>15</sup>N<sub>CBOM</sub> and δ<sup>15</sup>N<sub>periostracum</sub> values reliably record δ<sup>15</sup>N<sub>PN</sub> values in rivers and estuaries. The significant positive correlation between δ<sup>15</sup>N<sub>CBOM</sub> and δ<sup>15</sup>N<sub>periostracum</sub> values in both species indicates that they may be used in a similar manner to record δ<sup>15</sup>N<sub>PN</sub> values. The δ<sup>15</sup>N values in <i>E. complanata</i> muscle, mantle, and gill tissues were enriched by about +3.4‰ compared to δ<sup>15</sup>N<sub>PN</sub> from the water column, which suggests that they are primary consumers that reflect baseline trophic levels. On the other hand, δ<sup>15</sup>N values in the soft tissues of <i>R. cuneata</i> have trophic-level enrichment consistent with both primary and secondary consumption. Therefore, variations in the δ<sup>15</sup>N values of tissues in <i>R. cuneata</i> may be related to trophic-level shifts and/or changes in N sources. Differences between the δ<sup>15</sup>N values of soft tissue, CBOM, and periostracum in <i>E. complanata</i> and <i>R. cuneata</i> can be attributed to asynchronous growth, metabolic rate, and organic molecule composition. The δ<sup>15</sup>N<sub>CBOM</sub> values vary along a freshwater-estuarine gradient because of land-use change and differences in the trophic level of the compared species. The δ<sup>15</sup>N<sub>CBOM</sub> values between neighboring sites reflect influences from biosolid application and treated wastewater discharge. While δ<sup>15</sup>N<sub>CBOM</sub> values did not differentiate between sites dominated by urban and forested land-cover, δ<sup>15</sup>N<sub>CBOM</sub> values were highest at the site with the highest agricultural land-use. These results demonstrate the potential of δ<sup>15</sup>N<sub>CBOM</sub> values in bivalve shells to record long-term changes in watershed land use.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Assessing δ<sup>15</sup>N values in the carbonate-bound organic matrix and periostracum of bivalve shells as environmental archives","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-20 01:32:51.875833","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Nitrogen; Carbon; Stable isotopes; Trophic level; Environmental proxy; Land-use change","OtherDescriptors":null,"Notes":null,"AnaPub":2021,"MonPub":null,"DateUpdate":"2022-07-26","DateCreate":"2022-07-25","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000636756800002","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.palaeo.2020.110108"},"refs":null,"anarec":{"AnaID":354079,"PubliDate":2021,"Pagination":"110108","XtraPublOfAnaID":null,"ISBN":null,"Volume":"564","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43483,"SerRR":"Palaeogeography, Palaeoclimatology, Palaeoecology. 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