Table 2.
Analysis of inter- and intraspecific variance components of sugar composition parameters in the set of nectar samples studied, obtained by fitting linear mixed models to individual flower data (n = 498), with species and individuals (nested within species) as random effects and log-yeast cell density and its interaction with species as fixed effects (see Table 3 for the results of fixed effects from the same analyses)
| Nectar sugar composition parameter | Between species |
Individuals within species |
||||
|---|---|---|---|---|---|---|
| Variance estimate ± s.e. | Z-value | P-value | Variance estimate ± s.e. | Z-value | P-value | |
| Concentration* | ||||||
| Fructose | 4·20 ±1·53 | 2·75 | 0·0029 | 0·93 ± 0·26 | 3·58 | 0·0002 |
| Glucose | 7·72 ± 2·64 | 2·93 | 0·0017 | 1·14 ± 0·29 | 3·90 | <0·0001 |
| Sucrose | 89·94 ± 29·37 | 3·06 | 0·0011 | 6·66 ± 1·62 | 4·11 | <0·0001 |
| All sugars | 87·30 ± 30·64 | 2·85 | 0·0022 | 10·20 ± 2·92 | 3·49 | 0·0002 |
| Percentage of total sugars | ||||||
| Fructose | 195·04 ± 63·67 | 3·06 | 0·0011 | 21·90 ± 4·50 | 4·87 | <0·0001 |
| Glucose | 286·07 ± 92·35 | 3·10 | 0·0010 | 15·16 ± 3·50 | 4·33 | <0·0001 |
| Sucrose | 797·30 ± 255·33 | 3·12 | 0·0009 | 50·43 ± 11·03 | 4·57 | <0·0001 |
* Grams of solute per 100 mL of solution.