Abstract
The origin of eukaryotes in an anoxic versus an oxygenated environment is controversially discussed. To date, no conclusive data are available to decide this debate for the one or for the other camp. Yet, a substantial data set, coming from the anaerobic biochemistry of extant eukaryotes, the modeling of Proterozoic ocean chemistry, and earth’s history (specifically when considered in concerto), provides reasonable evidence for the hypothesis of an early eukaryote evolution in an anoxic world, which is summarized in the first part of this chapter. Contemporary anoxic and sulfidic environments are the stage on which to find the key players that can help to strengthen this view. We, in the second part of this chapter, present an ideal natural model system – the supersulfidic, anoxic Framvaren Fjord in south Norway – to study the evolution and diversity of unicellular eukaryotes – the protists – and summarize the knowledge that has been accumulated from the Framvaren Fjord in this field of research, evidencing the importance of such systems in evolution and biodiversity research.
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Stoeck, T., Behnke, A. (2012). The Anoxic Framvaren Fjord as a Model System to Study Protistan Diversity and Evolution. 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_22
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