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Carbon and Nitrogen Isotopic Fractionation in Foraminifera: Possible Signatures from Anoxia

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Anoxia

Abstract

Our study aims to record carbon and nitrogen isotopic fractionations in Foraminifera recovered from the sulfidic and long term anoxic environment of the Namibian diatomaceous mud belt. Two species which can be considered facultative anaerobes were investigated, Virgulinella fragilis Grindell and Collen and Nonionella stella Cushman and Moyer. The former species shelters presumably chemotrophic bacteria as endosymbionts and utilizes electron acceptors other than dissolved oxygen (Bernhard 2003; Tsuchia et al. 2006), and the latter species accumulates large quantities of intracellular nitrate for denitrification (Risgaard-Petersen et al. 2006; Høgslund 2008; Høgslund et al. 2008) and sequesters chloroplasts (Bernhard and Bowser 1999; Grzymski et al. 2002).

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Altenbach, A.V., Leiter, C., Mayr, C., Struck, U., Hiss, M., Radic, A. (2012). Carbon and Nitrogen Isotopic Fractionation in Foraminifera: Possible Signatures from Anoxia. In: Altenbach, A., Bernhard, J., Seckbach, J. (eds) Anoxia. Cellular Origin, Life in Extreme Habitats and Astrobiology, vol 21. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-1896-8_27

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