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Evidence for specific adaptations of fossil benthic foraminifera to anoxic–dysoxic environments

Published online by Cambridge University Press:  26 October 2015

Aaron Meilijson ,
Sarit Ashckenazi-Polivoda ,
Peter Illner ,
Heiko Alsenz ,
Robert P. Speijer ,
Ahuva Almogi-Labin ,
Shimon Feinstein ,
Wilhelm Püttmann  and
Sigal Abramovich
Aaron Meilijson
Affiliation:
Department of Geological and Environmental Sciences, Post Office Box 653, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel. E-mail: [email protected], [email protected].
Sarit Ashckenazi-Polivoda
Affiliation:
Dead Sea and Arava Science Center, Neve Zohar, Dead Sea 86910, Israel. E-mail: [email protected]
Peter Illner
Affiliation:
Institute for Mineralogy and Geochemistry, Karlsruhe University 76131 Karlsruhe, Germany. E-mail: [email protected]
Heiko Alsenz
Affiliation:
Institute of Atmospheric and Environmental Sciences, Department of Environmental and Analytical Chemistry, Goethe-University, Altenhöferallee 1 60438 Frankfurt am Main, Germany. E-mail: [email protected], [email protected]
Robert P. Speijer
Affiliation:
Department of Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, B- 3001 Leuven, Belgium. E-mail: [email protected]
Ahuva Almogi-Labin
Affiliation:
Geological Survey of Israel, Malkhe Israel 30, Jerusalem 95501, Israel. E-mail: [email protected]
Shimon Feinstein
Affiliation:
Department of Geological and Environmental Sciences, Post Office Box 653, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel. E-mail: [email protected], [email protected].
Wilhelm Püttmann
Affiliation:
Institute of Atmospheric and Environmental Sciences, Department of Environmental and Analytical Chemistry, Goethe-University, Altenhöferallee 1 60438 Frankfurt am Main, Germany. E-mail: [email protected], [email protected]
Sigal Abramovich
Affiliation:
Department of Geological and Environmental Sciences, Post Office Box 653, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel. E-mail: [email protected], [email protected].
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Abstract

It has generally been argued that the majority of fossil benthic foraminifera, the most common proxy for paleo bottom oceanic conditions, could not tolerate anoxia. Here we present evidence that fossil foraminifera were able to successfully colonize anoxic–dysoxic bottom waters, by using adaptations similar to those found in living species. Our study is based on a multi proxy micropaleontological and geochemical investigation of the Upper Cretaceous sediments from the Levant upwelling regime. A shift from buliminid to diverse trochospiral dominated assemblages was recorded in an interval with a distinct anoxic geochemical signature coinciding with a regional change in lithology. This change was triggered by an alteration in the type of primary producers from diatoms to calcareous nannoplankton, possibly causing modifications in benthic foraminiferal morphological and physiological adaptations to life in the absence of oxygen.

Our data show that massive blooms of triserial (buliminid) benthic foraminifera with distinct apertural and test morphologies during the Campanian were enabled by their ability to sequester diatom chloroplasts and associate with bacteria, in a similar manner as their modern analogs. Diverse trochospiral forms existed during the Maastrichtian by using nitrate instead of oxygen for their respiratory pathways in a denitrifying environment. Species belonging to the Stilostomellidae and Nodosariidae families might have been affected by the change in food type arriving to the seafloor after the phytoplankton turnover at the Campanian/Maastrichtian boundary, in a similar manner as their mid Pleistocene descendants prior to their extinction. This study promotes the need for a re-evaluation of the current models used for interpreting paleoceanographic data and demonstrates that the identification of adaptations and mechanisms involved in promoting sustained life under anoxic to dysoxic conditions should become a standard in faunal paleoceanographic studies.

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Articles
Information
Paleobiology , Volume 42 , Issue 1 , February 2016 , pp. 77 - 97
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Copyright © 2015 The Paleontological Society. All rights reserved 

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