{"refrec":{"BRefID":437594,"RR":"<b>van Dijk, I.; Mouret, A.*; Oron, S.; Evans, D.; Boer, W.; Barras, C.</b> (2025). Species‐specific offsets in manganese incorporation in hyaline foraminiferal calcite across a gradient of seawater [Mn]. <i>Geochem. Geophys. Geosyst. 26(10)</i>: e2025GC012363. <a href=\"https://dx.doi.org/10.1029/2025gc012363\" target=\"_blank\">https://dx.doi.org/10.1029/2025gc012363</a>","BEntID":435425,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Geochem. Geophys. Geosyst. 26(10)</i>: e2025GC012363. <a href=\"https://dx.doi.org/10.1029/2025gc012363\" target=\"_blank\">https://dx.doi.org/10.1029/2025gc012363</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"van Dijk, I.; Mouret, A.*; Oron, S.; Evans, D.; Boer, W.; Barras, C.","OrigTitleTranslFlag":0,"Authorstringtrunc":"van Dijk, I. <i>et al.</i>","Englishabstract":"<span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">Mn/Ca of foraminiferal calcite has been proposed as a tool to reconstruct past oxygen conditions, but the impact of the concentration of Mn ([Mn]) in seawater on partitioning of Mn in foraminiferal calcite remains unclear. Here, we explore Mn incorporation of different species of foraminifera across a gradient of seawater [Mn] by culturing small and large benthic foraminifera in hypoxic conditions using a controlled laboratory set-up. Our observations confirm previous results that Mn incorporation varies greatly between species and underline the need for species-specific calibrations and mono-species application of Mn-based proxies. We explore whether the observed species-specific incorporation of Mn could be due to an interaction between Mn incorporation and Mg content, or other processes related to the co-uptake, -transport and -precipitation of Mn and Mg to the calcification site and ultimately foraminiferal calcite. Furthermore, results show that for several species (</span><i>Ammonia confertitesta</i><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">, </span><i>Bulimina marginata</i><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">, </span><i>Cassidulina laevigata</i><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\"> and </span><i>Amphistegina lessonii</i><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">) partitioning of Mn increases below a species-specific threshold of seawater [Mn]. For application of the Mn-proxy, this slightly higher Mn partitioning can lead to a slight overestimation (up to 5-fold) of reconstructed seawater Mn/Ca at very low concentrations close to 0 (e.g., well oxygenated conditions), when assuming a constant distribution coefficient for this proxy. However, this only occurs at extremely low seawater Mn/Ca, below 1.06&nbsp;mmol/mol. This trend is less clear for the larger benthic foraminifera (</span><i>Amphistegina lessonii</i><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\"> and </span><i>Operculina ammonoides</i><span style=\"background-color:rgb(255,255,255);color:rgb(0,0,0);\">), where it is potentially masked by the larger range of Mn/Ca data and additional impacts on Mn incorporation, such as ontogeny.</span>","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Species‐specific offsets in manganese incorporation in hyaline foraminiferal calcite across a gradient of seawater [Mn]","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-06 01:35:37.730869","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"foraminifera; hypoxia; manganese; LA-ICP-MS; symbionts","OtherDescriptors":null,"Notes":null,"AnaPub":2025,"MonPub":null,"DateUpdate":"2026-02-11","DateCreate":"2026-02-11","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1,"DOI":"10.1029/2025gc012363"},"refs":null,"anarec":{"AnaID":437594,"PubliDate":2025,"Pagination":"e2025GC012363","XtraPublOfAnaID":null,"ISBN":null,"Volume":"26","Issue":"10","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":100768,"SerRR":"Geochemistry, Geophysics, Geosystems. 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