Rates and pattern of evolution among Cretaceous radiolarians: relations with global paleoceanographic events

Details

Serval ID
serval:BIB_5542E94D87B8
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Rates and pattern of evolution among Cretaceous radiolarians: relations with global paleoceanographic events
Journal
Micropaleontology
Author(s)
O'Dogherty L., Guex J.
ISSN-L
0026-2803
Publication state
Published
Issued date
2002
Peer-reviewed
Oui
Volume
48
Pages
1-22
Language
english
Notes
9th Meeting of the International Association of Radiolarian Paleontologists, BLAIRSDEN, CA, SEP 17-22, 2000
Abstract
We present a new approach for analyzing the turnover rates of Cretaceous
radiolarians recorded in pelagic sequences of western Tethys, The
analysis of major extinction-radiation events and the fluctuation of
diversity are compared with major paleoceanographic events and variation
of diversity in dinoflagellates, calcareous nannoplankton and ammonites.
There is an extraordinary correlation between biotic changes and sea
level changes, temperatures, O, C and Sr isotopes, phosphorus
accumulation rates and anoxic episodes. This reveals a predominantly
abiotic control on the evolution of radiolarians. The rate of turnover
and the diversity through time of two major orders of radiolarians
(nassellarians and spumellarians) exhibits (1) the quasi-parallelism of
their diversity curves, excluding a direct competition between them, (2)
greater resistance of spumellarians to extinction during the early stage
of extinction intervals and (3) a stronger post-extinction recovery of
nassellarians. Evolutionary rates of radiolarians can be a good means of
monitoring global environmental changes and allowing us to understand
more clearly the relationship between plankton evolution, climate and
pale oceanographic processes.
Create date
19/10/2012 15:48
Last modification date
20/08/2019 14:09
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