Higher Abundance of Bacteria than of Viruses in Deep Mediterranean Sediments Conclusion: Results obtained in this study suggest that the number of viruses in deep-sea sediments might be dependent upon complex interactions with both abiotic factors (such as pressure, physical disturbance, and redox conditions) and biotic factors, including bacterial metabolic state and virus supply from the water column. Further studies are needed to clarify the causes of the low viral density, to estimate the actual impact of viruses on benthic…