FIGURE 4.

Taxonomic diversity and relative abundance at the class level of bacteria from the samples collected at spring (A) and at winter (B). Sequences were taxonomically assigned to the Greengenes database (DeSantis et al., 2006) using QIIME (Caporaso et al., 2010). For clarity of presentation, unassigned sequences and classes comprising < 1% of the total number of sequences within a sample were simply classified as “Other.”