{"refrec":{"BRefID":292449,"RR":"<b>Petersen, J.; Barras, C.; Bézos, A.; La, C.; de Nooijer, L.; Meysman, F.J.R.; Mouret, A.; Slomp, C.P.; Jorissen, F.J.</b> (2018). Mn∕Ca intra- and inter-test variability in the benthic foraminifer <i>Ammonia tepida</i>. <i>Biogeosciences 15(1)</i>: 331-348. <a href=\"https://doi.org/10.5194/bg-15-331-2018\" target=\"_blank\">https://doi.org/10.5194/bg-15-331-2018</a>","BEntID":284501,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Biogeosciences 15(1)</i>: 331-348. <a href=\"https://doi.org/10.5194/bg-15-331-2018\" target=\"_blank\">https://doi.org/10.5194/bg-15-331-2018</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Petersen, J.; Barras, C.; Bézos, A.; La, C.; de Nooijer, L.; Meysman, F.J.R.; Mouret, A.; Slomp, C.P.; Jorissen, F.J.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Petersen, J. <i>et al.</i>","Englishabstract":"The adaptation of some benthic foraminiferal species to low-oxygen conditions provides the prospect of using the chemical composition of their tests as proxies for bottom water oxygenation. Manganese may be particularly suitable as such a geochemical proxy because this redox element is soluble in reduced form (Mn<sup>2+</sup>) and hence can be incorporated into benthic foraminiferal tests under low-oxygen conditions. Therefore, intra- and inter-test differences in foraminiferal Mn∕Ca ratios may hold important information about short-term variability in pore water Mn<sup>2+</sup> concentrations and sediment redox conditions. Here, we studied Mn∕Ca intra- and inter-test variability in living individuals of the shallow infaunal foraminifer <i>Ammonia tepida</i> sampled in Lake Grevelingen (the Netherlands) in three different months of 2012. The deeper parts of this lake are characterized by seasonal hypoxia/anoxia with associated shifts in microbial activity and sediment geochemistry, leading to seasonal Mn<sup>2+</sup> accumulation in the pore water. Earlier laboratory experiments with similar seawater Mn<sup>2+</sup> concentrations as encountered in the pore waters of Lake Grevelingen suggest that intra-test variability due to ontogenetic trends (i.e. size-related effects) and/or other vital effects occurring during calcification in <i>A. tepida</i> (11–25 % relative SD, RSD) is responsible for part of the observed variability in Mn∕Ca. Our present results show that the seasonally highly dynamic environmental conditions in the study area lead to a strongly increased Mn∕Ca intra- and inter-test variability (average of 45 % RSD). Within single specimens, both increasing and decreasing trends in Mn∕Ca ratios with size are observed. Our results suggest that the variability in successive single-chamber Mn∕Ca ratios reflects the temporal variability in pore water Mn<sup>2+</sup>. Additionally, active or passive migration of the foraminifera in the surface sediment may explain part of the observed Mn∕Ca variability.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Mn∕Ca intra- and inter-test variability in the benthic foraminifer <i>Ammonia tepida</i>","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":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2018,"MonPub":null,"DateUpdate":"2022-10-11","DateCreate":"2018-02-06","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000422808000001","VABBcode":null,"OpenAcc":1,"DOI":"10.5194/bg-15-331-2018"},"refs":null,"anarec":{"AnaID":292449,"PubliDate":2018,"Pagination":"331-348","XtraPublOfAnaID":null,"ISBN":null,"Volume":"15","Issue":"1","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":68092,"SerRR":"<b>Gattuso, J.P.; Kesselmeier, J. 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