Figure 3

Cyanobacterial genera. Relative abundance of cyanobacterial genera occurring above 1% relative abundance threshold (compared to all bacteria) in each U.S. river at each time point sampled in 2019. Samples are grouped by river (top) and arranged by date (shapes under each bar—see legend below shapes). Samples taken sequentially (replicates) are indicated by colored hashes below date shape. Samples with detectible microcystin toxin levels are indicated by asterisk above bar. Bar color indicates genera as shown by legend.