Deep-sea ostracode turnovers through the Paleocene-Eocene Thermal Maximum in DSDP Site 401, Bay of Biscay, North Atlantic

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doi: 10.1016/j.marmicro.2012.02.003
Author(s): Yamaguchi, Tatsuhiko; Norris, Richard D.
Author Affiliation(s): Primary:
Japan Society for the Promotion of Science, Japan
Scripps Institution of Oceanography, United States
Volume Title: Marine Micropaleontology
Source: Marine Micropaleontology, Vol.86-87, p.32-44. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0377-8398 CODEN: MAMIDH
Note: In English. Supplemental information/data is available in the online version of this article; includes appendix. 96 refs.; illus., incl. 1 table
Summary: Previous 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 (∼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 ∼50% species-level extinction in benthic foraminifers. Abstract Copyright (2012) Elsevier, B.V.
Year of Publication: 2012
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 10 Paleontology, Invertebrate; 12 Stratigraphy, Historical Geology and Paleoecology; Arthropoda; Atlantic Ocean; Bay of Biscay; Benthic taxa; C-13/C-12; Carbon; Cenozoic; Chemostratigraphy; Cluster analysis; Crustacea; DSDP Site 401; Deep Sea Drilling Project; Deep-sea environment; Extinction; Faunal list; Faunal studies; IPOD; Invertebrata; Isotope ratios; Isotopes; Leg 48; Mandibulata; Marine environment; Microfossils; Morphology; North Atlantic; O-18/O-16; Ostracoda; Oxygen; Paleocene-Eocene Thermal Maximum; Paleoecology; Paleoenvironment; Paleogene; Paleogeography; SEM data; Stable isotopes; Statistical analysis; Taxonomy; Tertiary
Coordinates: N472538 N472540 W0084837 W0084838
Record ID: 2013015220
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands