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Bachmann, Jennifer; Heimbach, Tabea; Hassenrück, Christiane; Kopprio, Germa; Iversen, Morten Hvitfeldt; Grossart, Hans-Peter; Gärdes, Astrid (2018): Bacterial community composition off the coast of Mauritania and Senegal during METEOR cruise M129. PANGAEA,, Supplement to: Bachmann, J et al. (2018): Environmental Drivers of Free-Living vs. Particle-Attached Bacterial Community Composition in the Mauritania Upwelling System. Frontiers in Microbiology, 9,

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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.
Related 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. European Nucleotide Archive (ENA), insdc:PRJEB26997
Median Latitude: 17.802655 * Median Longitude: -17.475512 * South-bound Latitude: 12.999830 * West-bound Longitude: -20.749830 * North-bound Latitude: 20.749330 * East-bound Longitude: -16.228000
Date/Time Start: 2016-08-03T10:56:00 * Date/Time End: 2016-08-21T11:24:00
Minimum DEPTH, water: 2.6 m * Maximum DEPTH, water: 198.1 m
M129_837-1 * Latitude: 20.749330 * Longitude: -20.749830 * Date/Time: 2016-08-03T10:56:00 * Elevation: -3985.9 m * Location: Canarias Sea * Campaign: M129 * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
M129_840-1 * Latitude: 19.782500 * Longitude: -18.833670 * Date/Time: 2016-08-04T22:37:00 * Elevation: -2846.1 m * Location: South Atlantic Ocean * Campaign: M129 * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
M129_844-1 * Latitude: 20.533330 * Longitude: -17.400500 * Date/Time: 2016-08-05T18:58:00 * Elevation: -45.2 m * Location: Canarias Sea * Campaign: M129 * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventBachmann, Jennifer
2Sample IDSample IDBachmann, Jennifersample title
3Uniform resource locator/link to referenceURL refBachmann, JenniferNCBI Taxonomy ID
4Sample commentSample commentBachmann, Jenniferdeatiled sample description
5DEPTH, waterDepth watermBachmann, JenniferGeocode
6LocationLocationBachmann, Jennifer
7EnvironmentEnvironmentBachmann, JenniferBIOME: marine biome;
8EnvironmentEnvironmentBachmann, JenniferMATERIAL: sea water;
9EnvironmentEnvironmentBachmann, Jenniferfeature
10Temperature, waterTemp°CBachmann, Jennifer
11SalinitySalBachmann, Jennifer
12OxygenO2µmol/lBachmann, Jennifer
13TurbidityTurbidityarbitrary unitsBachmann, Jenniferin mg per cubic meter
14FluorescenceFluorescencearbitrary unitsBachmann, Jenniferin mg per cubic meter
15Nitrate and Nitrite[NO3]- + [NO2]-µmol/lBachmann, Jennifer
16Ammonium[NH4]+µmol/lBachmann, Jennifer
17Nitrite[NO2]-µmol/lBachmann, Jennifer
18Nitrate[NO3]-µmol/lBachmann, Jennifer
19Phosphate[PO4]3-µmol/lBachmann, Jennifer
20SilicateSi(OH)4µmol/lBachmann, Jennifer
21Nitrogen/Phosphorus ratioN/PBachmann, Jennifer
22Carbon, organic, dissolvedDOCµmol/lBachmann, Jennifer
23Carbon, total, particulateTPCµg/lBachmann, Jenniferretained on a GFF filter
24Carbon, organic, particulatePOCµg/lBachmann, Jenniferretained on a GFF filter
25Carbon, inorganic, particulatePICµg/lBachmann, Jenniferretained on a GFF filter
26Nitrogen, particulatePNµg/lBachmann, Jenniferretained on a GFF filter
27Carbon/Nitrogen ratioC/NBachmann, Jennifer
28DescriptionDescriptionBachmann, Jenniferof fraction
1260 data points

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