Document Detail

End-Cretaceous marine mass extinction not caused by productivity collapse.
MedLine Citation:
PMID:  22207626     Owner:  NLM     Status:  MEDLINE    
An asteroid impact at the end of the Cretaceous caused mass extinction, but extinction mechanisms are not well-understood. The collapse of sea surface to sea floor carbon isotope gradients has been interpreted as reflecting a global collapse of primary productivity (Strangelove Ocean) or export productivity (Living Ocean), which caused mass extinction higher in the marine food chain. Phytoplankton-dependent benthic foraminifera on the deep-sea floor, however, did not suffer significant extinction, suggesting that export productivity persisted at a level sufficient to support their populations. We compare benthic foraminiferal records with benthic and bulk stable carbon isotope records from the Pacific, Southeast Atlantic, and Southern Oceans. We conclude that end-Cretaceous decrease in export productivity was moderate, regional, and insufficient to explain marine mass extinction. A transient episode of surface ocean acidification may have been the main cause of extinction of calcifying plankton and ammonites, and recovery of productivity may have been as fast in the oceans as on land.
Laia Alegret; Ellen Thomas; Kyger C Lohmann
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2011-12-29
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  109     ISSN:  1091-6490     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-02-06     Completed Date:  2012-03-21     Revised Date:  2013-06-26    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  728-32     Citation Subset:  IM    
Departamento de Ciencias de la Tierra, Universidad Zaragoza, 50009 Zaragoza, Spain.
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MeSH Terms
Aquatic Organisms / growth & development*
Carbon Isotopes
Extinction, Biological*
Foraminifera / growth & development
Time Factors
Reg. No./Substance:
0/Carbon Isotopes

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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