georefid:2013-015220SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2013-07-08T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1016/j.marmicro.2012.02.0032012-01-01publicationgeorefid:2013-015220doi:10.1016/j.marmicro.2012.02.003Yamaguchi, TatsuhikoJapan Society for the Promotion of Science, JapanauthorNorris, Richard D.Scripps Institution of Oceanography, United StatesauthorElsevier, Amsterdam, NetherlandspublisherdocumentHardcopyMarine Micropaleontology86-8732-44Previous low resolution studies suggest that ostracodes, in contrast with deep sea foraminifera, largely survived the massive environmental changes of the Paleocene-Eocene thermal maximum (PETM). In a new high-resolution study from the continental slope ( approximately 1800 m paleodepth) NE Atlantic, we also find extensive survivorship of ostracode faunas, but this is accompanied by a temporary drop in species diversity and ecological diversity during the PETM. There are 12 common ostracode species before the PETM that are reduced to only two species at the same time as the benthic foraminiferal extinction event. All but three species reappear in the later parts of the PETM and statistical analysis suggests that most of the apparent "Lazarus" species might be found with sufficient sampling of PETM faunas. We find no evidence for an excursion fauna of ostracodes as has been detected in calcareous nannofossils, planktic foraminifera, and benthic foraminifera. However, the ostracode assemblages changed from a relatively diverse ecological assemblage before and after the PETM to one dominated by infaunal species typical of low oxygen conditions during the PETM. The absence of major extinction and the temporary nature of species disappearances are comparable to turnovers in shallow marine ostracodes and stands in sharp contrast to the approximately 50% species-level extinction in benthic foraminifers. Abstract Copyright (2012) Elsevier, B.V.completedInvertebrate paleontologyStratigraphyArthropodaAtlantic OceanBay of Biscaybenthic taxaC-13/C-12carbonCenozoicchemostratigraphycluster analysisCrustaceaDeep Sea Drilling Projectdeep-sea environmentDSDP Site 401extinctionfaunal listfaunal studiesInvertebrataIPODisotope ratiosisotopesLeg 48Mandibulatamarine environmentmicrofossilsmorphologyNorth AtlanticO-18/O-16OstracodaoxygenPaleocene-Eocene Thermal MaximumpaleoecologypaleoenvironmentPaleogenepaleogeographySEM datastable isotopesstatistical analysistaxonomyTertiaryurn:org.iodp:exp:48urnlargerWorkCitationcampaignurn:org.iodp:exp:48:site:401urnlargerWorkCitationstudyurn:org.iodp:exp:48urnlargerWorkCitationcampaignEnglishgeoscientificInformation-8.4838-8.483747.253847.2540Supplemental information/data is available in the online version of this article; includes appendix