Abstract
The dark ocean refers to the oceanic water column deeper than 200 m, which includes the mesopelagic (200–1000 m), bathypelagic (1000–4000 m), abyssopelagic (4000–6000 m), and hadalpelagic (>6000 m) realms. This vast system is in terms of volume the largest habitat of the biosphere, harboring the largest reservoir of microbes in aquatic systems, and most of the heterotrophic microbial biomass and production of the global ocean. Despite its relevance, knowledge on the phylogenetic and functional diversity of the dark ocean’s microbes is rather limited compared to the euphotic waters. In this chapter, recent advances in our understanding of the dark ocean’s microbiome are summarized. The spatial and temporal heterogeneity of microbial communities and surface-deep ocean connectivity are described as well as their functional diversity. The chapter is concluding with a section summarizing the limited information available on the phylogenetic and functional microbial diversity of the abyssal and hadal realm. With this chapter, we hope to call the attention of the need to deepen our understanding on the dark ocean’s microbiome.
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Acknowledgments
GJH was supported by the Austrian Science Fund (FWF) project ARTEMIS (P28781-B21), the projects I486-B09 and P23234-B11, and by the European Research Council (ERC) under the European Community’s Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement 268595 (MEDEA project). FB was supported by the Austrian Science Fund (FWF) project OCEANIDES (P34304-B), by a University of Otago Research Grant and a Rutherford Discovery Fellowship (Royal Society of New Zealand).
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Baltar, F., Herndl, G.J. (2022). Microbial Inhabitants of the Dark Ocean. In: Stal, L.J., Cretoiu, M.S. (eds) The Marine Microbiome. The Microbiomes of Humans, Animals, Plants, and the Environment, vol 3. Springer, Cham. https://doi.org/10.1007/978-3-030-90383-1_10
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