Bacterial community composition off the coast of Mauritania and Senegal during METEOR cruise M129

DOI

Saharan dust input and seasonal upwelling along North–West Africa provide a model system for studying microbial processes related to the export and recycling of nutrients. This study offers the first molecular characterization of prokaryotic particle-attached (PA; >3.0 μm) and free-living (FL; 0.2–3.0 μm) players in this important ecosystem during August 2016. Environmental drivers for alpha-diversity, bacterial community composition, and differences between FL and PA fractions were identified. The ultra-oligotrophic waters off Senegal were dominated by Cyanobacteria while higher relative abundances of Alphaproteobacteria, Bacteroidetes, Verrucomicrobia, and Planctomycetes (known particle-degraders) occurred in the upwelling area. Temperature, proxy for different water masses, was the best predictor for changes in FL communities. PA community variation was best explained by temperature and ammonium. Bray Curtis dissimilarities between FL and PA were generally very high and correlated with temperature and salinity in surface waters. Greatest similarities between FL and PA occurred at the deep chlorophyll maximum, where bacterial substrate availability was likely highest. This indicates that environmental drivers do not only influence changes among FL and PA communities but also differences between them. This could provide an explanation for contradicting results obtained by different studies regarding the dissimilarity/similarity between FL and PA communities and their biogeochemical functions.

Supplement to: Bachmann, Jennifer; Heimbach, Tabea; Hassenrück, Christiane; Kopprio, Germa; Iversen, Morten Hvitfeldt; Grossart, Hans-Peter; Gärdes, Astrid (2018): Environmental Drivers of Free-Living vs. Particle-Attached Bacterial Community Composition in the Mauritania Upwelling System. Frontiers in Microbiology, 9

Identifier
DOI https://doi.org/10.1594/PANGAEA.889977
Related Identifier https://doi.org/10.3389/fmicb.2018.02836
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.889977
Provenance
Creator Bachmann, Jennifer; Heimbach, Tabea; Hassenrück, Christiane ORCID logo; Kopprio, Germa; Iversen, Morten Hvitfeldt ORCID logo; Grossart, Hans-Peter ORCID logo; Gärdes, Astrid ORCID logo
Publisher PANGAEA
Publication Year 2018
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Language English
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 1260 data points
Discipline Earth System Research
Spatial Coverage (-20.750W, 13.000S, -16.228E, 20.749N); Canarias Sea; South Atlantic Ocean
Temporal Coverage Begin 2016-08-03T10:56:00Z
Temporal Coverage End 2016-08-21T11:24:00Z