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Fig. S1. Vertical patterns of the virus-to-prokaryote abundance ratio (VPR) along the vertical profiles in the two investigated habitats. A, non-vegetated sediments; B, vegetated sediments.

Fig. S2. T-RFLP electropherograms in non-vegetated and vegetated sediments in different sediment horizons and habitats. Shown are the results obtained using the enzyme Rsa I.

Table S1. Environmental and biotic drivers of prokaryotic abundance in the sediments from the two habitats based on DISTLM analysis outputs. Data are from the forward selection procedure with the conditional tests (i.e. fitting each variable one at a time, conditional on the variables that are already included in the model). The cumulative percentage of variance is also reported. P-value is expressed as * (statistical significance at P < 0.05 in the marginal test), ** (P < 0.01) and *** (P < 0.001). pH data are not available for vegetated sediments. SS, sum of square; p-F, pseudo-F; Prop %, percentage of variance explained by each variable; n.s., not significant.

Table S2. Environmental and biotic drivers of prokaryotic heterotrophic production in the sediments from the two habitats based on DISTLM analysis outputs. Data are from the forward selection procedure with the conditional tests (i.e. fitting each variable one at a time, conditional on the variables that are already included in the model). The cumulative percentage of variance is also reported. P-value is expressed as * (statistical significance at P < 0.05 in the marginal test), ** (P < 0.01) and *** (P < 0.001). pH data are not available for vegetated sediments. SS, sum of square; p-F, pseudo-F; Prop %, percentage of variance explained by each variable; n.s., not significant.

Table S3. Environmental and biotic drivers of α-diversity patterns in the sediments from the two habitats based on DISTLM analysis outputs. Data are from the forward selection procedure with the conditional tests (i.e. fitting each variable one at a time, conditional on the variables that are already included in the model). The cumulative percentage of variance is also reported. P-value is expressed as * (statistical significance at P < 0.05 in the marginal test), ** (P < 0.01) and *** (P < 0.001). pH data are not available for vegetated sediments. SS, sum of square; p-F, pseudo-F; Prop %, percentage of variance explained by each variable; n.s., not significant.

Table S4. Environmental and biotic drivers of β-diversity patterns in the sediments from the two habitats based on DISTLM analysis outputs. Data are from the forward selection procedure with the conditional tests (i.e. fitting each variable one at a time, conditional on the variables that are already included in the model). The cumulative percentage of variance is also reported. P-value is expressed as * (statistical significance at P < 0.05 in the marginal test), ** (P < 0.01) and *** (P < 0.001). SS, sum of square; p-F, pseudo-F; Prop %, percentage of variance explained by each variable; n.s., not significant.

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