56336 20190131090522.0 doi 10.1002/2015PA002837 sideral 94585 ART-2016-94585 eng (orcid)0000-0003-0662-6840 Arreguín-Rodríguez, G.J. Late Paleocene-middle Eocene benthic foraminifera on a Pacific seamount (Allison Guyot, ODP Site 865): Greenhouse climate and superimposed hyperthermal events 2016 Access copy available to the general public Unrestricted We investigated the response of late Paleocene-middle Eocene (~60-37.5 Ma) benthic foraminiferal assemblages to long-term climate change and hyperthermal events including the Paleocene-Eocene Thermal Maximum (PETM) at Ocean Drilling Program (ODP) Site 865 on Allison Guyot, a seamount in the Mid-Pacific Mountains. Seamounts are isolated deep-sea environments where enhanced current systems interrupt bentho-pelagic coupling, and fossil assemblages from such settings have been little evaluated. Assemblages at Site 865 are diverse and dominated by cylindrical calcareous taxa with complex apertures, an extinct group which probably lived infaunally. Dominance of an infaunal morphogroup is unexpected in a highly oligotrophic setting, but these forms may have been shallow infaunal suspension feeders, which were ecologically successful on the current-swept seamount. The magnitude of the PETM extinction at Site 865 was similar to other sites globally, but lower diversity postextinction faunas at this location were affected by ocean acidification as well as changes in current regime, which might have led to increased nutrient supply through trophic focusing. A minor hyperthermal saw less severe effects of changes in current regime, with no evidence for carbonate dissolution. Although the relative abundance of infaunal benthic foraminifera has been used as a proxy for surface productivity through bentho-pelagic coupling, we argue that this proxy can be used only in the absence of changes in carbonate saturation and current-driven biophysical linking. info:eu-repo/grantAgreement/ES/DGA/E05 info:eu-repo/grantAgreement/ES/MINECO-FEDER/CGL2014-58794-P info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 3.254 2016 GEOSCIENCES, MULTIDISCIPLINARY 37 / 188 = 0.197 2016 Q1 T1 PALEONTOLOGY 1 / 53 = 0.019 2016 Q1 T1 OCEANOGRAPHY 8 / 62 = 0.129 2016 Q1 T1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion (orcid)0000-0002-8801-9544 Alegret, L. Universidad de Zaragoza Thomas, E. 2000 655 Universidad de Zaragoza Dpto. Ciencias de la Tierra Área Paleontología 31, 3 (2016), 346-364 Paleoceanography PALEOCEANOGRAPHY 0883-8305 1734095 http://zaguan.unizar.es/record/56336/files/texto_completo.pdf Versión publicada 128506 http://zaguan.unizar.es/record/56336/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:56336 articulos driver 2019-01-31-08:57:28 ARTICLE