Faunal turnovers in central Pacific benthic foraminifera during the Paleocene-Eocene thermal maximum

Kotaro Takeda, Kunio Kaiho

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

Although it is well known that the Paleocene/Eocene thermal maximum (PETM) coincided with a major benthic foraminiferal extinction event, the detailed pattern of the faunal turnover has not yet been clarified. Our high-resolution benthic foraminiferal and carbon isotope analyses at the low latitude Pacific Ocean Shatsky Rise have revealed the following record of major faunal transitions: (1) An initial turnover which involved the benthic foraminiferal extinction event (BFE). The BFE, marked by a sharp transition from Pre-extinction fauna to Disaster fauna represented by small-sized Bolivina gracilis, expresses the onset of the PETM and the abrupt extinction of about 30% of taxa. This faunal transition lasted about 45-74 kyr after the initiation of the PETM and was followed by: (2) the appearance of Opportunistic fauna represented by Quadrimorphina profunda, which existed for about 74-91 kyr after the initiation of the PETM. These two faunas, which appeared after the extinction event, are characterized by low diversity and dwarfism, possibly due to lowered oxygen condition and decreased surface productivity. The second pronounced turnover involved the gradual recovery from Opportunistic Fauna to the establishment of Recovery fauna, which coincided with the recovery about 83-91 kyr after its initiation.

Original languageEnglish
Pages (from-to)175-197
Number of pages23
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume251
Issue number2
DOIs
Publication statusPublished - 2007 Aug 3

Keywords

  • Benthic foraminifera
  • C13/C12
  • Dissolved oxygen
  • Eocene
  • Faunal turnovers
  • Paleocene

ASJC Scopus subject areas

  • Oceanography
  • Ecology, Evolution, Behavior and Systematics
  • Earth-Surface Processes
  • Palaeontology

Fingerprint Dive into the research topics of 'Faunal turnovers in central Pacific benthic foraminifera during the Paleocene-Eocene thermal maximum'. Together they form a unique fingerprint.

  • Cite this