{"refrec":{"BRefID":365489,"RR":"<b>Zeman-Kuhnert, S.; Heim, C.; Öztoprak, M.; Thiel, V.</b> (2023). Reconstructing eutrophication trends of a shallow lake environment using biomarker dynamics and sedimentary sterols. <i>Org. Geochem. 177</i>: 104555. <a href=\"https://dx.doi.org/10.1016/j.orggeochem.2023.104555\" target=\"_blank\">https://dx.doi.org/10.1016/j.orggeochem.2023.104555</a>","BEntID":363210,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Org. Geochem. 177</i>: 104555. <a href=\"https://dx.doi.org/10.1016/j.orggeochem.2023.104555\" target=\"_blank\">https://dx.doi.org/10.1016/j.orggeochem.2023.104555</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Zeman-Kuhnert, S.; Heim, C.; Öztoprak, M.; Thiel, V.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Zeman-Kuhnert, S. <i>et al.</i>","Englishabstract":"Major extractable lipid biomarkers (hydrocarbons, sterols and fatty acids)    were assessed in Lake Seeburg, a shallow eutrophic lake that has    increasingly been suffering from cyanobacterial blooms due to continued    anthropogenic nutrient inputs over the last decades. Over the course of one    year (2018/19), the distributions of these compounds were analyzed in the    inflow, the lake water, and the topmost sediments (0–2 cm) to assess their    origin and transfer into the lake deposits. Principal component analysis    (PCA) was used to cluster the studied biomarkers into 5 groups with similar    characteristics. These groups were comprised of (i) compounds delivered from    external sources via the inflow, (ii) autochthonous compounds formed in the    lake by eukaryotes or (iii) bacteria, (iv) compounds accumulating in the    surface sediment, and (v) C<sub>27</sub> to C<sub>29</sub> stenols together with their degradation    products, C<sub>27</sub> to C<sub>29</sub> 5α(H)-stanols. Their seasonal partition clearly    revealed that C<sub>27</sub> stenols mainly derived from autochthonous sources within    the lake, whereas C<sub>29</sub> stenols largely reflect allochthonous material    reaching the lake via the inflow. Analysis of stenol plus stanol    concentrations with depth in two lake sediment cores (≈30 and 50 cm) found    highest C<sub>27</sub> to C<sub>29</sub> ratios in surface sediments with lowest ratios at depth.    These signals are interpreted to reflect the increasing trend of    eutrophication of Lake Seeburg and, thus, enhanced autochthonous organic    matter production in the lake over the last decades. The abundances of C<sub>27</sub>    vs. C<sub>29</sub> stenols, summed with their respective degradation products,    5α(H)-stanols, are considered as suitable molecular indicators to    qualitatively reconstruct historical eutrophication trends.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Reconstructing eutrophication trends of a shallow lake environment using biomarker dynamics and sedimentary sterols","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-05-24 01:32:15.295367","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Shallow lake; Eutrophication; Seasonal biomarker dynamics; Principal component analysis; Hydrocarbons; Sterols; Fatty acids; Biomarker preservation; Diagenesis","OtherDescriptors":null,"Notes":null,"AnaPub":2023,"MonPub":null,"DateUpdate":"2023-07-05","DateCreate":"2023-07-05","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000964182900001","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.orggeochem.2023.104555"},"refs":null,"anarec":{"AnaID":365489,"PubliDate":2023,"Pagination":"104555","XtraPublOfAnaID":null,"ISBN":null,"Volume":"177","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":111331,"SerRR":"Organic Geochemistry. 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