{"refrec":{"BRefID":334023,"RR":"<b>Wang, K.J.; Huang, Y.; Majaneva, M.; Belt, S.T.; Liao, S.; Novak, J.; Kartzinel, T.R.; Herbert, T.D.; Richter, N.; Cabedo-Sanz, P.</b> (2021). Group 2i Isochrysidales produce characteristic alkenones reflecting sea ice distribution. <i>Nature Comm. 12</i>: 15. <a href=\"https://doi.org/10.1038/s41467-020-20187-z\" target=\"_blank\">https://doi.org/10.1038/s41467-020-20187-z</a>","BEntID":330578,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Nature Comm. 12</i>: 15. <a href=\"https://doi.org/10.1038/s41467-020-20187-z\" target=\"_blank\">https://doi.org/10.1038/s41467-020-20187-z</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Wang, K.J.; Huang, Y.; Majaneva, M.; Belt, S.T.; Liao, S.; Novak, J.; Kartzinel, T.R.; Herbert, T.D.; Richter, N.; Cabedo-Sanz, P.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Wang, K.J. <i>et al.</i>","Englishabstract":"<p>    Alkenones are biomarkers produced solely by algae in the order    Isochrysidales that have been used to reconstruct sea surface temperature    (SST) since the 1980s. However, alkenone-based SST reconstructions in the    northern high latitude oceans show significant bias towards warmer    temperatures in core-tops, diverge from other SST proxies in down core    records, and are often accompanied by anomalously high relative abundance    of the C<sub>37</sub> tetra-unsaturated methyl alkenone (%C<sub>37:4</sub>    ). Elevated %C<sub>37:4</sub> is widely interpreted as an indicator of low    sea surface salinity from polar water masses, but its biological source has    thus far remained elusive. Here we identify a lineage of Isochrysidales    that is responsible for elevated C<sub>37:4</sub> methyl alkenone in the    northern high latitude oceans through next-generation sequencing and    lab-culture experiments. This Isochrysidales lineage co-occurs widely with    sea ice in marine environments and is distinct from other known marinealkenone-producers, namely <em>Emiliania huxleyi</em> and    <em>Gephyrocapsa oceanica</em>. More importantly, the %C<sub>37:4</sub> in    seawater filtered particulate organic matter and surface sediments is    significantly correlated with annual mean sea ice concentrations. In    sediment cores from the Svalbard region, the %C<sub>37:4</sub>    concentration aligns with the Greenland temperature record and other    qualitative regional sea ice records spanning the past 14 kyrs, reflectingsea ice concentrations quantitatively. Our findings imply that %C    <sub>37:4</sub> is a powerful proxy for reconstructing sea ice conditions    in the high latitude oceans on thousand- and, potentially, on million-year    timescales.</p>","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Group 2i Isochrysidales produce characteristic alkenones reflecting sea ice distribution","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-10 01:32:34.040965","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2021,"MonPub":null,"DateUpdate":"2021-03-09","DateCreate":"2021-02-18","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000665625900012","VABBcode":null,"OpenAcc":1,"DOI":"10.1038/s41467-020-20187-z"},"refs":null,"anarec":{"AnaID":334023,"PubliDate":2021,"Pagination":"15","XtraPublOfAnaID":null,"ISBN":null,"Volume":"12","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":198717,"SerRR":"Nature Communications. 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