Nannoplankton origination events and environmental changes in the late Paleocene and early Eocene

Andrea L. Kalb, Timothy Bralower

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The origination of six nannoplankton species in the late Paleocene to middle Eocene involves significant change in the entire nannofossil assemblage. The change began at the first occurrence and accelerates at the increase in abundance of the new species. The changes in the environment generally reflect the preferred ecology of the originating species. The species that originated in the late Paleocene to early Eocene (outside of the Paleocene-Eocene thermal maximum (PETM)) are generally thought to be oligotrophic taxa adapted to warm water conditions. During this long interval, temperatures were generally increasing and nutrient availability was decreasing; conditions that would have been advantageous for the originating taxa. Conversely, the species that originated in the middle Eocene are generally thought to be mesotrophs adapted to colder water conditions. These taxa were selected for during a time of generally increasing nutrient availability and decreasing temperature. Orbital stratigraphy indicates that the first occurrences of three Paleocene taxa are time transgressive by up to 400. kyr. The only event that appears to be synchronous is the abundance increase of Zygrhablithus bijugatus during the PETM. This species is thought to be mesotrophic and replaces the genus Fasciculithus at a time when nutrient availability was likely increasing rapidly.

Original languageEnglish (US)
Pages (from-to)1-15
Number of pages15
JournalMarine Micropaleontology
Volume92-93
DOIs
StatePublished - Sep 1 2012

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nanoplankton
Paleocene
environmental change
Eocene
nutrient availability
Hypsithermal
nanofossil
warm water
cold water
stratigraphy
temperature
new species
ecology

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Palaeontology

Cite this

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Nannoplankton origination events and environmental changes in the late Paleocene and early Eocene. / Kalb, Andrea L.; Bralower, Timothy.

In: Marine Micropaleontology, Vol. 92-93, 01.09.2012, p. 1-15.

Research output: Contribution to journalArticle

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