Table 1.
Minimum inhibitory concentrations (50 and 100% kill) values for six bee species showing a sequence from solitary to eusocial organization. (Group size was the mean from 20 nests for each species. Within-group relatedness (R) was estimated using microsatellite genotypes. Standard errors are given in parentheses.)
| status | species | MIC(50) | MIC(100) | group size | R |
|---|---|---|---|---|---|
| solitary | Amegilla asserta | 201.1 (±17.0) | 362.0 (±28.9) | 1 | — |
| solitary | Amegilla bombiformis | 220.8 (±42.5) | 280.2 (±59.4) | 1 | — |
| semi-social | Exoneura robusta | 29.3 (±2.8) | 38.2 (±3.4) | 6.4 (±1.2) | 0.312 |
| semi-social | Exoneura nigrescens | 15.6 (±0.2) | 17.3 (±0.1) | 8.2 (±1.83) | 0.468 |
| eusocial | Exoneurella tridentate | 50.4 | 68.3 | 14.1 (±2.4) | 0.664 |
| eusocial | Trigona carbonaria | 0.7 (±0.2) | 2.2 (±0.3) | >1000 | 0.695 |