{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,3]],"date-time":"2026-10-03T04:53:30Z","timestamp":1791003210230,"version":"4.1.0"},"reference-count":67,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2026,10,2]],"date-time":"2026-10-02T00:00:00Z","timestamp":1790899200000},"content-version":"vor","delay-in-days":31,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T00:00:00Z","timestamp":1788220800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Geobiology"],"published-print":{"date-parts":[[2026,9]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    This study investigates the occurrence of aromatic carotenoids and oxygen\u2010bearing geolipids, namely \u03b3\u2010\n                    <jats:italic>n<\/jats:italic>\n                    \u2010alkyl\u2010\u03b3\u2010butyrolactones, \u03b4\u2010\n                    <jats:italic>n<\/jats:italic>\n                    \u2010alkyl\u2010\u03b4\u2010valerolactones, and \u03b3\u2010isoprenoid\u2010alkyl\u2010\u03b3\u2010butyrolactones, in Miocene sediments from the Valjevo\u2010Mionica Basin (Serbia), from the 360\u2013400\u2009m depth interval. Soluble organic matter was analyzed by gas chromatography\u2013mass spectrometry (GC\u2013MS), and the biomarker data were integrated with previously published geological, mineralogical, and geochemical data to reconstruct the depositional environment. Aromatic carotenoid distributions provide evidence for photic\u2010zone euxinia (PZE) and indicate changes in microbial community composition within the stratified lacustrine system. Isorenieratane and \u03b2\u2010isorenieratane predominance in the 360\u2013370\u2009m interval is most consistent with strongly stratified PZE conditions favoring low\u2010light\u2010adapted green sulfur bacteria. In contrast, the 370\u2013380\u2009m interval records a greater contribution from purple sulfur bacteria, as indicated by abundant okenane, whereas the prevalence of renierapurpurane in the 380\u2013400\u2009m interval, together with elevated Li, Mg, and B concentrations and clay minerals, is compatible with a significant cyanobacterial contribution under alkaline, restricted\u2010basin conditions. The occurrence of \u03b3\u2010 and \u03b4\u2010lactones is consistent with anoxic, saline depositional environments characterized by limited bioturbation and active microbial transformation of organic matter, with subsequent cyclization and dehydration occurring during early diagenesis. Mass spectral fragmentation patterns indicate the presence of a previously undescribed compound (molecular mass ~568\u2009Da) within the 370\u2013390\u2009m interval, for which intramolecular lactonization of a torularhodin\u2010derived precursor is proposed as one plausible formation pathway. These findings expand the diversity of biomarkers associated with PZE and contribute to paleoenvironmental reconstructions of paleolakes, which represent sensitive archives of global paleoclimate change.\n                  <\/jats:p>","DOI":"10.1111\/gbi.70069","type":"journal-article","created":{"date-parts":[[2026,10,3]],"date-time":"2026-10-03T04:21:41Z","timestamp":1791001301000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Biomarker Evidence for Photic\u2010Zone Euxinia and Oxygen\u2010Bearing Geolipids in Miocene Sediments of the Valjevo\u2010Mionica Basin"],"prefix":"10.1111","volume":"24","author":[{"given":"Aleksandra","family":"\u0160ajnovi\u0107","sequence":"first","affiliation":[{"name":"Institute of Chemistry, Technology and Metallurgy, National Institute of the Republic of Serbia University of Belgrade  Belgrade Serbia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5582-7393","authenticated-orcid":false,"given":"Nikola","family":"Burazer","sequence":"additional","affiliation":[{"name":"Institute of Chemistry, Technology and Metallurgy, National Institute of the Republic of Serbia University of Belgrade  Belgrade Serbia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2483-1779","authenticated-orcid":false,"given":"Vladimir","family":"Simi\u0107","sequence":"additional","affiliation":[{"name":"Faculty of Mining and Geology University of Belgrade  Belgrade Serbia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Branimir","family":"Jovan\u010di\u0107evi\u0107","sequence":"additional","affiliation":[{"name":"Faculty of Chemistry University of Belgrade  Belgrade Serbia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,10,2]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.apgeochem.2026.106917"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0146\u20106380(01)00042\u20100"},{"key":"e_1_2_11_4_1","doi-asserted-by":"publisher","DOI":"10.1080\/00206814.2024.2431815"},{"key":"e_1_2_11_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0016\u20107037(00)00423\u20103"},{"key":"e_1_2_11_6_1","unstructured":"Bhosale P.2001.\u201cStudies on YeastRhodotorula Its Carotenoids and Their Applications.\u201d Doctoral Dissertation University of Pune Pune India."},{"key":"e_1_2_11_7_1","doi-asserted-by":"publisher","DOI":"10.1007\/s002530000570"},{"key":"e_1_2_11_8_1","doi-asserted-by":"publisher","DOI":"10.1007\/s13358\u2010019\u201000194\u20104"},{"key":"e_1_2_11_9_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature04068"},{"key":"e_1_2_11_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.gca.2007.12.006"},{"key":"e_1_2_11_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0146\u20106380(98)00086\u20102"},{"key":"e_1_2_11_12_1","doi-asserted-by":"publisher","DOI":"10.1093\/plankt\/fbw066"},{"key":"e_1_2_11_13_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.2006379117"},{"key":"e_1_2_11_14_1","doi-asserted-by":"publisher","DOI":"10.1038\/s43247\u2010022\u201000668\u20103"},{"key":"e_1_2_11_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/0146\u20106380(95)00040\u2010L"},{"key":"e_1_2_11_16_1","first-page":"127","volume-title":"Marine Organic Matter: Biomarkers, Isotopes and DNA","author":"Damst\u00e9 J. 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