{"refrec":{"BRefID":220286,"RR":"<b>D'haenens, S.; Bornemann, A.; Roose, K.; Claeys, P.; Speijer, R.P.</b> (2012). Stable isotope paleoecology (d<sup>13</sup>C and d<sup>18</sup>O) of early Eocene <i>Zeauvigerina aegyptiaca</i> from the North Atlantic (DSDP Site 401). <i>Austrian J. Earth Sci. 105(1)</i>: 179-188","BEntID":212019,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Austrian J. Earth Sci. 105(1)</i>: 179-188","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"D'haenens, S.; Bornemann, A.; Roose, K.; Claeys, P.; Speijer, R.P.","OrigTitleTranslFlag":0,"Authorstringtrunc":"D'haenens, S. <i>et al.</i>","Englishabstract":"Within the expanded and clay-enriched interval following the Paleocene-Eocene Thermal Maximum (PETM; ~55.8 Ma) at Deep Sea Drilling Project (DSDP) Site 401 (eastern North Atlantic), high abundances of well-preserved biserial planktic foraminifera such as <i>Zeauvigerina aegyptiaca</i> and <i>Chiloguembelina</i> spp. occur. The paleoecological preferences of these taxa are only poorly constrained, largely because existing records are patchy in time and space. The thin-walled <i>Z. aegyptiaca</i> is usually rather small (<125 µm) and thus prone to recrystallization and dissolution; stable isotopes measurements are therefore virtually non-existent. A comparative stable isotope (d<sup>13</sup>C and d<sup>18</sup>O) study of well-preserved specimens of <i>Z. aegyptiaca</i> and several planktic foraminiferal species (<i>Morozovella subbotinae, Subbotina patagonica, Chiloguembelina wilcoxensis</i>) enabled us to determine the preferred depth habitat and mode of life for <i>Z. aegyptiaca</i>. Oxygen isotope values of <i>Z. aegyptiaca</i> range from -1.57‰ to -2.07‰ and overlap with those of <i>M. subbotinae</i> indicating that their habitat is (1) definitely planktic, which has been questioned by some earlier isotopic studies, and (2) probably within the lower surface mixed layer. Carbon isotope ratios range from 0.99‰ to 1.34‰ and are distinctly lower than values for non-biserial planktic species. This may indicate isotopic disequilibrium between ambient seawater and the calcareous tests of <i>Z. aegyptiaca</i>, which we relate to vital effects and to its opportunistic behavior. The observed isotopic signal of <i>Z. aegyptiaca</i> relative to the other planktic foraminiferal species is highly similar to many other microperforate bi- and triserial planktic genera that have appeared through geological time such as <i>Heterohelix, Guembelitria, Chiloguembelina, Streptochilus</i> and <i>Gallitellia</i> and we suggest that <i>Z. aegyptiaca</i> shares a similar ecology and habitat. Thus, in order for the opportunistic <i>Z. aegyptiaca</i> to bloom during the aftermath of the PETM, we assume that at that time, the surface waters at Site 401 were influenced by increased terrestrial run-off and nutrient availability.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Stable isotope paleoecology (d<sup>13</sup>C and d<sup>18</sup>O) of early Eocene <i>Zeauvigerina aegyptiaca</i> from the North Atlantic (DSDP Site 401)","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":"Paleocene-Eocene Thermal Maximum, biserial planktic foraminifera, ecological opportunism, depth habitat, ontogeny","OtherDescriptors":null,"Notes":null,"AnaPub":2012,"MonPub":null,"DateUpdate":"2013-12-03","DateCreate":"2012-11-21","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000304628000019","VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":220286,"PubliDate":2012,"Pagination":"179-188","XtraPublOfAnaID":null,"ISBN":null,"Volume":"105","Issue":"1","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":220217,"SerRR":"Austrian Journal of Earth Sciences = Mitteilungen der Österreichischen Geologischen Gesellschaft. Austrian Geological Society: Wien.  ISSN 2072-7151; e-ISSN 2072-7151","StandardTitleSer":"Austrian Journal of Earth Sciences = Mitteilungen der Österreichischen Geologischen Gesellschaft","ISSN":"2072-7151","AbbrevSer":"Austrian J. 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