Pearson’s correlation between the number of mapped reads obtained from libraries 3A and 3B using different primer pairs.

All = all species and all primer pairs; All mammals = all primer pairs including only mammalian species; All avian species = all primer pairs including only avian species; when primer pairs are indicated, all species were used in the correlation; the different primer pairs were also considered separately for mammalian and avian species as indicated. Correlation between the results of the two libraries obtained with primer pair 16S_Ki for the avian species is biased due to the lack of sequenced reads in birds.Pearson’s correlation between the number of mapped reads obtained from libraries 3A and 3B using different primer pairs.