Biogeosciences Discuss., 10, 9243-9284, 2013
www.biogeosciences-discuss.net/10/9243/2013/
doi:10.5194/bgd-10-9243-2013
© Author(s) 2013. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Biogeosciences (BG). Please refer to the corresponding final paper in BG.
Foraminiferal survival after long term experimentally induced anoxia
D. Langlet1, E. Geslin1, C. Baal2, E. Metzger1, F. Lejzerowicz3, B. Riedel4, M. Zuschin2, J. Pawlowski3, M. Stachowitsch4, and F. J. Jorissen1
1LUNAM Université, Université d'Angers, CNRS, UMR6112 LPGN-BIAF – Laboratoire des Bio-Indicateurs Actuels et Fossiles, 2 Boulevard Lavoisier, 49045 Angers Cedex, France
2University of Vienna, Department of Paleontology, Althanstrasse 14, 1090, Vienna, Austria
3University of Geneva, Department of Genetics and Evolution, 1211 Genève 4, Switzerland
4University of Vienna, Department of Limnology and Oceanography, Althanstrasse 14, 1090, Vienna, Austria

Abstract. Anoxia has been successfully induced in four benthic chambers installed on the Northern Adriatic seafloor from 1 week to 10 months. To accurately determine whether benthic foraminifera can survive experimentally induced prolonged anoxia, the CellTrackerGreen method has been applied. Numerous individuals have been found living at all sampling times and at all sampling depths, showing that benthic foraminifera can survive up to 10 months of anoxia with co-occurring hydrogen sulphides. However, foraminiferal standing stocks decrease with sampling time in an irregular way. A large difference in standing stock between two cores samples in initial conditions indicates the presence of a large spatial heterogeneity of the foraminiferal faunas. An unexpected increase in standing stocks after 1 month is tentatively interpreted as a reaction to increased food availability due to the massive mortality of infaunal macrofaunal organisms. After this, standing stocks decrease again in a core sampled after 2 months of anoxia, to attain a minimum in the cores sampled after 10 months. We speculate that the trend of overall decrease of standing stocks is not due to the adverse effects of anoxia and hydrogen sulphides, but rather due to a continuous diminution of labile organic matter.

Citation: Langlet, D., Geslin, E., Baal, C., Metzger, E., Lejzerowicz, F., Riedel, B., Zuschin, M., Pawlowski, J., Stachowitsch, M., and Jorissen, F. J.: Foraminiferal survival after long term experimentally induced anoxia, Biogeosciences Discuss., 10, 9243-9284, doi:10.5194/bgd-10-9243-2013, 2013.
 
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