Common honey bee gut bacterial species groups are ubiquitous and detected by multiple approaches.

Honey bee species group designations after Babendreier et al. [8]. #-For studies using T-RFLP or similar method, presence is shown as “+.” Number of unique associated sequences are indicated in parentheses. For studies with random sequencing, percent representation is given. *-Several other distant lineages retrieved but frequencies cannot be estimated due to the methods used in these studies. ̂-Sequences were mostly from cultured isolates and thus may not represent all bacteria in the gut. $-Reads that clustered within the Alpha-2 species group did not pass our initial filtering criteria. These reads were identified after selecting for those between 310–350 bp long. The average abundance of Alpha-2 reads in our analysis of the Mattila et al. (2012) dataset was 1.22%, SD = 0.80%. &-Includes the CFB-1 bee species group.