{"refrec":{"BRefID":296677,"RR":"<b>Schilder, J.; van Roij, L.; Reichart, G.-J.; Sluijs, A.; Heiri, O.</b> (2018). Variability in δ<super>13</super> C values between individual  <i>Daphnia</i>  ephippia: Implications for palaeo-studies. <i>Quat. Sci. Rev. 189</i>: 127-133. <a href=\"https://doi.org/10.1016/j.quascirev.2018.04.007\" target=\"_blank\">https://doi.org/10.1016/j.quascirev.2018.04.007</a>","BEntID":288766,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Quat. Sci. Rev. 189</i>: 127-133. <a href=\"https://doi.org/10.1016/j.quascirev.2018.04.007\" target=\"_blank\">https://doi.org/10.1016/j.quascirev.2018.04.007</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Schilder, J.; van Roij, L.; Reichart, G.-J.; Sluijs, A.; Heiri, O.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Schilder, J. <i>et al.</i>","Englishabstract":"The stable carbon isotope ratio (δ<super>13</super> C value) of <i>Daphnia</i> spp. resting egg shells (ephippia) provides information on past changes in <i>Daphnia</i> diet. Measurements are typically performed on samples of _20 ephippia, which obscures the range of values associated with individual ephippia. Using a recently developed laser ablation-based technique, we perform multiple δ<super>13</super> C analyses on individual ephippia, which show a high degree of reproducibility (standard deviations 0.1e0.5‰). We further measured δ<super>13</super> C values of 13 ephippia from surface sediments of three Swiss lakes. In the well-oxygenated lake with low methane concentrations, δ<super>13</super> C values are close to values typical for algae (_31.4‰) and the range in values is relatively small (5.8‰). This variability is likely driven by seasonal (or inter-annual) variability in algae δ<super>13</super> C values. In two seasonally anoxic lakes with higher methane concentrations, average values were lower (_41.4 and _43.9‰, respectively) and the ranges much larger (10.7 and 20.0‰).We attribute this variability to seasonal variation in incorporation of methane-derived carbon. In one lake we identify two statistically distinct isotopic populations, which may reflect separate production peaks. The potentially large within-sample variability should be considered when interpreting small-amplitude, short-lived isotope excursions based on samples consisting of few ephippia. We show that measurements on single ephippia can be performed using laser ablation, which allows for refined assessments of past <i>Daphnia</i> diet and carbon cycling in lake food webs. Furthermore, our study provides a basis for similar measurements on other chitinous remains (e.g. from chironomids, bryozoans).","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Variability in δ<super>13</super> C values between individual  <i>Daphnia</i>  ephippia: Implications for palaeo-studies","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":"Daphnia ephippia; Stable carbon isotopes; Laser ablation; Lakes; Seasonality; Present; Palaeolimnology; Europe; Stable isotopes","OtherDescriptors":null,"Notes":null,"AnaPub":2018,"MonPub":null,"DateUpdate":"2018-06-07","DateCreate":"2018-06-07","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000432758500008","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.quascirev.2018.04.007"},"refs":null,"anarec":{"AnaID":296677,"PubliDate":2018,"Pagination":"127-133","XtraPublOfAnaID":null,"ISBN":null,"Volume":"189","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":45667,"SerRR":"Quaternary Science Reviews. Pergamon Press: Oxford; New York.  ISSN 0277-3791; e-ISSN 1873-457X","StandardTitleSer":"Quaternary Science Reviews","ISSN":"0277-3791","AbbrevSer":"Quat. Sci. 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