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Seasonal changes in the abundance of free virus-like particles (VLPs) and ratios of viruses to bacteria (VBRs) in four microhabitats of a littoral freshwater marsh. (A and E) Marsh water column. (B and F) Biofilm on reed stems. (C and G) Decaying plant litter. (D and H) Aerobic top sediment layer. Error bars depict ±1 SE; n = 6 (each histogram).
