Spatial distribution of viruses, bacteria and chlorophyll a in neritic, oceanic and estuarine environments

Abstract

The spatial distribution of viruses was investigated in the coastal and oceanic waters of the Southern California Bight and the brackish waters of the Gulf of Bothnia. Total virus abundances ranged from 0.3 to 52 × 109 l-1; higher concentrations of viruses were found in the upper 50 m of the water column and in coastal environments. Viruses with capsid diameters <60 nm dominated the virus community, were morphologically characterized as bacteriophages and were responsible for most of the observed spatial variability. Bacteria abundance alone explained 67% of the spatial variability in virus numbers, suggesting that bacteria constituted the major host organisms for viruses in these physically diverse habitats. -from Authors