Table 1.
Generalised linear models of the chemotaxis index in two Burkholderia species (B. agricolaris and B. hayleyella) in response to five D. discoideum host types in the (A) full model, (B) Post-hoc Tukey tests by host type and (C) by symbiont species. Significant effects are highlighted in bold.
| A) Full model | |||
| Fixed effects | DF | Chi-Square | P |
| Symbiont species | 1 | 0.74 | 0.388 |
| Host type | 4 | 29.91 | <0.001 |
| Burkholderia clone (Symbiont species) | 4 | 70.52 | <0.001 |
| Host clone (Host type) | 10 | 143.75 | <0.001 |
| Symbiont species*Host type | 4 | 43.45 | <0.001 |
| B) By Host Type | |||
| Pairwise differences | Variance ± SE | Z value | P |
| B. agricolaris farmer (B. agricolaris vs. B. hayleyella) | −0.302 ± 0.181 | −1.66 | 0.096 |
| B. hayleyella farmer (B. agricolaris vs. B. hayleyella) | −0.499 ± 0.371 | −1.35 | 0.178 |
| Non-farmer (B. agricolaris vs. B. hayleyella) | 0.457 ± 0.300 | 1.52 | 0.128 |
| Cured B. agricolaris farmer (B. agricolaris vs. B. hayleyella) | −0.061 ± 0.323 | −0.19 | 0.85 |
| Cured B. hayleyella farmer (B. agricolaris vs. B. hayleyella) | 0.014 ± 0.156 | 0.09 | 0.927 |
| C) By Symbiont species | |||
| Pairwise differences | Variance ± SE | Z value | P |
| B. agricolaris (B. agricolaris farmer vs. non-farmer) | −0.055 ± 0.167 | −0.33 | 0.997 |
| B. agricolaris (B. agricolaris farmer vs. B. hayleyella farmer) | 0.167 ± 0.170 | 0.98 | 0.863 |
| B. agricolaris (B. agricolaris farmer vs. cured B. agricolaris farmer) | 0.266 ± 0.215 | 1.24 | 0.73 |
| B. agricolaris (B. agricolaris farmer vs. cured B. hayleyella farmer) | 0.320 ± 0.185 | 1.73 | 0.418 |
| B. agricolaris (B. hayleyella farmer vs. non-farmer) | −0.222 ± 0.178 | −1.25 | 0.722 |
| B. agricolaris (B. hayleyella farmer vs. cured B. hayleyella farmer) | 0.153 ± 0.195 | 0.79 | 0.935 |
| B. agricolaris (cured B. agricolaris farmer vs. cured B. hayleyella farmer) | 0.054 ± 0.235 | 0.23 | 0.999 |
| B. agricolaris (cured B. agricolaris farmer vs. non-farmer) | −0.321 ± 0.221 | −1.45 | 0.595 |
| B. agricolaris (cured B. agricolaris farmer vs. B. hayleyella farmer) | −0.099 ± 0.223 | −0.44 | 0.992 |
| B. agricolaris (cured B. hayleyella farmer vs. non-farmer) | −0.375 ± 0.193 | −1.95 | 0.292 |
| B. hayleyella (B. agricolaris farmer vs. non-farmer) | 0.565 ± 0.210 | 2.69 | 0.007 |
| B. hayleyella (B. agricolaris farmer vs. B. hayleyella farmer) | 0.149 ± 0.182 | 0.82 | 0.411 |
| B. hayleyella (B. agricolaris farmer vs. cured B. agricolaris farmer) | 0.543 ± 0.268 | 2.02 | 0.043 |
| B. hayleyella (B. agricolaris farmer vs. cured B. hayleyella farmer) | 0.693 ± 0.230 | 3.01 | 0.003 |
| B. hayleyella (B. hayleyella farmer vs. non-farmer) | 0.416 ± 0.236 | 1.77 | 0.057 |
| B. hayleyella (B. hayleyella farmer vs. cured B. hayleyella farmer) | 0.544 ± 0.254 | 2.15 | 0.032 |
| B. hayleyella (cured B. agricolaris farmer vs. cured B. hayleyella farmer) | 0.150 ± 0.322 | 0.47 | 0.64 |
| B. hayleyella (cured B. agricolaris farmer vs. non-farmer) | 0.023 ± 0.308 | 0.07 | 0.95 |
| B. hayleyella (cured B. agricolaris farmer vs. B. hayleyella farmer) | −0.393 ± 0.289 | −1.36 | 0.173 |
| B. hayleyella (cured B. hayleyella farmer vs. non-farmer) | −0.128 ± 0.275 | −0.46 | 0.643 |