Figure 1.
Location of sampling stations of the LTER site HAUSGARTEN and corresponding pigment concentrations (CPE).
Distances in km between sampling stations were calculated from latitude or longitude only for the latitudinal and bathymetric transect, respectively. Map created with GeoMapApp [70].
Figure 2.
Comparison of bacterial classes in sediments from HAUSGARTEN with other datasets.
A: Globally distributed sediments; B: sediments from the Siberian continental margin. The solid lines indicate the best fit using linear regression; solid grey lines indicate 95% confidence intervals; dotted grey lines indicate predicted intervals at a 95% confidence level; dotted black lines indicate the case where equal proportions were found in the datasets being compared (y = x).
Figure 3.
Accumulation curves per taxonomic category based on MPTS data.
Arrows indicate how many stations are needed to recover 95% of categories per taxonomic level. The percentages indicated for n = 1 station correspond to how much diversity would be recovered on average by randomly sampling only one station.
Figure 4.
Changes in bacterial community structure with water depth and CPE concentrations and along spatial distance for the two transects.
The plots A, B, C and D are based on MPTS data, plots in E, F, G and H are based on ARISA data. Filled circles indicate comparisons of samples from the latitudinal transect, open circles indicate comparisons of samples from the bathymetric transect, crosses indicate comparisons across transects. C, D, G and H are based on a subset of 6 and 8 samples for the bathymetric and latitudinal transects, respectively. Mantel tests were used to assess the significance of Spearman’s correlation coefficients (r) based on 1000 permutations.
Figure 5.
Non-metric multidimensional scaling (NMDS) plot of community data.
MPTS (A) and ARISA (B) data based on Bray-Curtis dissimilarity matrices. Open circles indicate stations from the bathymetric transect, filled circles indicate stations from the latitudinal transect and the crosses indicate the central station. Dotted lines show a minimum spanning tree connecting nearest neighbours. Stress values: 0.05 for A and 0.06 for B.
Table 1.
Community response to spatial and environmental factors.