Table 1.
Results of statistical tests of bacterial OTU richness (S), diversity Exp(H), and community composition (redundancy analysis (RDA)) of floral nectar from both apple and pear, and sampling time including start of the flowering period (day 1), peak blooming (day 4), and three days later (day 7)
| Fruit species | Model | df | test | t value | p‐value |
|---|---|---|---|---|---|
| Bacterial OTU richness | |||||
| Apple & Pear | Sampling time x species | 2 | χ 2 | 265.3 | <.0001 |
| Apple | Sampling time | 2 | χ 2 | 282.52 | <.0001 |
| Apple | Day 1 vs. Day 4 | 1 | χ 2 | 235.08 | <.0001 |
| Apple | Day 1 vs. Day 7 | 1 | χ 2 | 68.13 | <.0001 |
| Apple | Day 4 vs. Day 7 | 1 | χ 2 | 45.6 | <.0001 |
| Pear | Sampling time | 2 | χ 2 | 141.15 | <.0001 |
| Pear | Day 1 vs. Day 4 | 1 | χ 2 | 5.42 | .02 |
| Pear | Day 1 vs. Day 7 | 1 | χ 2 | 33.36 | <.0001 |
| Pear | Day 4 vs. Day 7 | 1 | χ 2 | 141.14 | <.0001 |
| Exp(H) | |||||
| Apple & Pear | Sampling time x species | 2 | χ 2 | 190.06 | <.0001 |
| Apple | Sampling time | 2 | χ 2 | 121.69 | <.0001 |
| Apple | Day 1 vs. Day 4 | 1 | χ 2 | 104.31 | <.0001 |
| Apple | Day 1 vs. Day 7 | 1 | χ 2 | 13.74 | .0002 |
| Apple | Day 4 vs. Day 7 | 1 | χ 2 | 38.37 | <.0001 |
| Pear | Sampling time | 2 | χ 2 | 151.34 | <.0001 |
| Pear | Day 1 vs. Day 4 | 1 | χ 2 | 1.67 | .2 |
| Pear | Day 1 vs. Day 7 | 1 | χ 2 | 50.78 | <.0001 |
| Pear | Day 4 vs. Day 7 | 1 | χ 2 | 149.86 | <.0001 |
| Bacterial community composition | |||||
| Apple & Pear | Sampling time x species | 2 | F | 3.81 | .001 |
| Apple | Sampling time | 2 | F | 8.64 | .001 |
| Apple | Day 1 vs. Day 4 | 1 | F | 12.58 | .003 |
| Apple | Day 1 vs. Day 7 | 1 | F | 9.98 | .003 |
| Apple | Day 4 vs. Day 7 | 1 | F | 1.57 | .096 |
| Pear | Sampling time | 2 | F | 2.12 | .001 |
| Pear | Day 1 vs. Day 4 | 1 | F | 1.34 | .03 |
| Pear | Day 1 vs. Day 7 | 1 | F | 1.97 | .003 |
| Pear | Day 4 vs. Day 7 | 1 | F | 2.72 | .003 |
| Mantel test* | |||||
| Apple & Pear | R | 0.06 | .069 | ||
| Apple | R | 0.17 | .014 | ||
| Pear | R | −0.04 | .776 | ||
*
For the Mantel test, the correlation coefficient was given and not the t value.