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Global diversity and biogeography of deep-sea pelagic prokaryotes

AutorSalazar, Guillem ; Cornejo-Castillo, Francisco M. ; Benítez Barrios, Verónica ; Fraile-Nuez, E.; Álvarez-Salgado, Xosé Antón ; Duarte, Carlos M. ; Gasol, Josep M. ; Acinas, Silvia G.
Fecha de publicación2016
EditorInternational Society for Microbial Ecology
CitaciónISME Journal 10: 596-608 (2016)
ResumenThe deep-sea is the largest biome of the biosphere, and contains more than half of the whole ocean’s microbes. Uncovering their general patterns of diversity and community structure at a global scale remains a great challenge, as only fragmentary information of deep-sea microbial diversity exists based on regional-scale studies. Here we report the first globally comprehensive survey of the prokaryotic communities inhabiting the bathypelagic ocean using high-throughput sequencing of the 16S rRNA gene. This work identifies the dominant prokaryotes in the pelagic deep ocean and reveals that 50% of the operational taxonomic units (OTUs) belong to previously unknown prokaryotic taxa, most of which are rare and appear in just a few samples. We show that whereas the local richness of communities is comparable to that observed in previous regional studies, the global pool of prokaryotic taxa detected is modest (~3600 OTUs), as a high proportion of OTUs are shared among samples. The water masses appear to act as clear drivers of the geographical distribution of both particle-attached and free-living prokaryotes. In addition, we show that the deep-oceanic basins in which the bathypelagic realm is divided contain different particle-attached (but not free-living) microbial communities. The combination of the aging of the water masses and a lack of complete dispersal are identified as the main drivers for this biogeographical pattern. All together, we identify the potential of the deep ocean as a reservoir of still unknown biological diversity with a higher degree of spatial complexity than hitherto considered
Descripción13 pages, 6 figures, 1 table, supplementary Information http://www.nature.com/ismej/journal/v10/n3/suppinfo/ismej2015137s1.html
Versión del editorhttp://dx.doi.org/10.1038/ismej.2015.137
Identificadoresdoi: 10.1038/ismej.2015.137
issn: 1751-7362
e-issn: 1751-7370
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