Fig. 1

Diel transcript abundances of viral genes in the North Pacific Subtropical Gyre. a Every 4 h over 8 days (July 27–31 and August 1–3, 2015), the transcript abundances of viral genes at each sampling time point were normalized to the total non-rRNA transcripts that were aligned to an in-house microbial protein database. The transcript proportions of the five most abundant virus groups are shown. Grey bars indicate night periods. The pie chart on the right shows the average transcript proportions of cyanomyovirus, cyanopodovirus, and cyanosiphovirus relative to the total cyanophage transcripts. b Numbers of total genes and genes with diurnal transcriptional rhythms are shown for cyanophages, phages infecting heterotrophic bacteria, and algal viruses (see Supplementary Table 1 for details)