Abstract
Marine sediments cover more than two-thirds of the Earth’s surface and have been estimated to contain as much as one-third of Earth’s prokaryotic biomass (Whitman et al. 1998). Despite this, relatively little is known about this deep biosphere, and essentially nothing is known about the presence of microbial eukaryotes (protists) in sediments deeper than a few centimeters. Through consumption of dissolved organic matter and by selective grazing in subsurface horizons where bacterial and/or archaeal numbers are high, protists may significantly impact carbon cycling in the marine subsurface. An understanding of the biogeochemical activities, composition, and temporal and spatial dynamics of marine subsurface communities is essential for accurate modeling of nutrient cycling in this vast subsurface biosphere.
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 Acknowledgements
Support for the deep subsurface investigation of fungi was provided by a grant from the Deep Ocean Exploration Institute, Woods Hole Oceanographic Institution (award number 32031109) and a NASA NPP fellowship administered by ORAU to JB.
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Edgcomb, V.P., Biddle, J.F. (2012). Microbial Eukaryotes in the Marine Subsurface?. 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_25
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