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The colonization of the oceans by calcifying pelagic algae.

Authors :
Suchéras-Marx, Baptiste
Mattioli, Emanuela
Allemand, Pascal
Giraud, Fabienne
Pittet, Bernard
Plancq, Julien
Escarguel, Gilles
Source :
Biogeosciences Discussions; 2018, p1-16, 16p
Publication Year :
2018

Abstract

The rise of calcareous nannoplankton in Mesozoic oceans has deeply impacted ocean chemistry and contributed to shape modern oceans. Nevertheless, the calcareous nannoplankton colonization of past marine environments remains poorly understood. Based on an extensive compilation of published and unpublished data, we show that their accumulation rates in sediments increased from the Early Jurassic (~ 200 Ma) to the Early Cretaceous (~ 120 Ma), although these algae diversified up to the end of the Mesozoic (66 Ma). After the middle Eocene (~ 45 Ma), a decoupling occurred between accumulation rates, diversity and coccolith size. The time series analysed points toward a three-phase evolutionary dynamic. An Invasion phase of the open-ocean realms was followed by a Specialization phase occurring along with taxonomic diversification, ended by an Establishment phase where few small-sized species dominated. The current hegemony of calcareous nannoplankton in the World Ocean results from a long-term and complex evolutionary history shaped by ecological interactions and abiotic forcing. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
18106277
Database :
Complementary Index
Journal :
Biogeosciences Discussions
Publication Type :
Academic Journal
Accession number :
133801095
Full Text :
https://doi.org/10.5194/bg-2018-493