Diversity and Biogeography of Bathyal and Abyssal Seafloor Bacteria and Archaea Along a Mediterranean—Atlantic Gradient

Type Article
Date 2021-11
Language English
Author(s) Trouche Blandine1, Brandt Miriam2, Belser Caroline3, Orejas Covadonga4, Pesant Stéphane5, Poulain Julie3, Wincker Patrick3, Auguet Jean-Christophe6, Arnaud-Haond SophieORCID2, Maignien Lois1, 7
Affiliation(s) 1 : Univ Brest, CNRS, IFREMER, Microbiology of Extreme Environments Laboratory (LM2E), Plouzané, France
2 : MARBEC, Univ Montpellier, Ifremer, IRD, CNRS, Sète, France
3 : Génomique Métabolique, Genoscope, Institut François Jacob, CEA, CNRS, Univ. Évry, Université Paris-Saclay, Evry, France
4 : Centro Oceanográfico de Baleares, Instituto Español de Oceanografía, Palma de Mallorca, Spain
5 : European Molecular Biology Laboratory, European Bioinformatics Institute, Cambridge, United Kingdom
6 : MARBEC, Univ Montpellier, CNRS, IFREMER, IRD, Montpellier, France
7 : Marine Biological Laboratory, Josephine Bay Paul Center for Comparative Molecular Biology and Evolution, Woods Hole, MA, United States
Source Frontiers In Microbiology (1664-302X) (Frontiers Media SA), 2021-11 , Vol. 12 , P. 702016 (14p.)
DOI 10.3389/fmicb.2021.702016
WOS© Times Cited 2
Keyword(s) biogeography, distance-decay relationship, dispersal limitation, drift, benthic microbiology, seafloor sediment, bathyal zone, metabarcoding

Seafloor sediments cover the majority of planet Earth and microorganisms inhabiting these environments play a central role in marine biogeochemical cycles. Yet, description of the biogeography and distribution of sedimentary microbial life is still too sparse to evaluate the relative contribution of processes driving this distribution, such as the levels of drift, connectivity, and specialization. To address this question, we analyzed 210 archaeal and bacterial metabarcoding libraries from a standardized and horizon-resolved collection of sediment samples from 18 stations along a longitudinal gradient from the eastern Mediterranean to the western Atlantic. Overall, we found that biogeographic patterns depended on the scale considered: while at local scale the selective influence of contemporary environmental conditions appeared strongest, the heritage of historic processes through dispersal limitation and drift became more apparent at regional scale, and ended up superseding contemporary influences at inter-regional scale. When looking at environmental factors, the structure of microbial communities was correlated primarily with water depth, with a clear transition between 800 and 1,200 meters below sea level. Oceanic basin, water temperature, and sediment depth were other important explanatory parameters of community structure. Finally, we propose increasing dispersal limitation and ecological drift with sediment depth as a probable factor for the enhanced divergence of deeper horizons communities.

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Table S2 39 KB Open access
Table S5 24 KB Open access
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Trouche Blandine, Brandt Miriam, Belser Caroline, Orejas Covadonga, Pesant Stéphane, Poulain Julie, Wincker Patrick, Auguet Jean-Christophe, Arnaud-Haond Sophie, Maignien Lois (2021). Diversity and Biogeography of Bathyal and Abyssal Seafloor Bacteria and Archaea Along a Mediterranean—Atlantic Gradient. Frontiers In Microbiology, 12, 702016 (14p.). Publisher's official version : https://doi.org/10.3389/fmicb.2021.702016 , Open Access version : https://archimer.ifremer.fr/doc/00733/84457/