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Fossil Record A palaeontological open-access journal of the Museum für Naturkunde
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Volume 14, issue 1
Foss. Rec., 14, 95–101, 2011
https://doi.org/10.1002/mmng.201000017
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Foss. Rec., 14, 95–101, 2011
https://doi.org/10.1002/mmng.201000017
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

  01 Feb 2011

01 Feb 2011

Trajectories of Late Permian – Jurassic radiolarian extinction rates: no evidence for an end-Triassic mass extinction

W. Kiessling1,2 and T. Danelian2 W. Kiessling and T. Danelian
  • 1Museum für Naturkunde Berlin, Invalidenstraße 43, 10115 Berlin, Germany
  • 2Laboratoire Géosystèmes (FRE 3298), Université Lille 1, UFR des Sciences de la Terre – bâtiment SN, 59655 Villeneuve d'Ascq cedex, France

Abstract. The hypothesis that ocean acidification was a proximate trigger of the marine end-Triassic mass extinction rests on the assumption that taxa that strongly invest in the secretion of calcium-carbonate skeletons were significantly more affected by the crisis than other taxa. An argument against this hypothesis is the great extinction toll of radiolarians that has been reported from work on local sections. Radiolarians have siliceous tests and thus should be less affected by ocean acidification. We compiled taxonomically vetted occurrences of late Permian and Mesozoic radiolarians and analyzed extinction dynamics of radiolarian genera. Although extinction rates were high at the end of the Triassic, there is no evidence for a mass extinction in radiolarians but rather significantly higher background extinction in the Triassic than in the Jurassic. Although the causes for this decline in background extinction levels remain unclear, the lack of a major evolutionary response to the end-Triassic event, gives support for the hypothesis that ocean acidification was involved in the dramatic extinctions of many calcifying taxa.

doi:10.1002/mmng.201000017

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