Table 4. Concentrations of malate, inorganic anions and cations as well as the proportions of the single ions in the nectar.
| Species | Total malate [mM] | Total anions [mM] | Percentages of anions [%] | Total cations [mM] | Percentages of cations [%] | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cl- | NO3- | PO43- | SO42- | K+ | Na+ | NH4+ | Mg2+ | Ca2+ | ||||
| day flowering | ||||||||||||
| N. africana | 0.1 ± 0.1 | 3.5 ± 1.4 | 96 ± 3 | 2 ± 2 | 1 ± 1 | 1 ± 1 | 11.5 ± 2.0 | 95 ± 1 | 3 ± 1 | 0 ± 0 | 1 ± 0 | 0 ± 0 |
| N. attenuata | 1.5 ± 0.6 | 3.6 ± 1.3 | 58 ± 13 | 29 ± 12 | 5 ± 2 | 9 ± 3 | 4.3 ± 1.1 | 85 ± 4 | 7 ± 2 | 0 ± 0 | 3 ± 0 | 5 ± 2 |
| N. glauca | 0.2 ± 0 | 0.5 ± 0.1 | 71 ± 4 | 4 ± 5 | 15 ± 5 | 10 ± 4 | 1.0 ± 0.5 | 91 ± 2 | 4 ± 1 | 3 ± 2 | 4 ± 1 | 2 ± 0 |
| N. knightiana | 1.8 ± 0.4 | 3.7 ± 0.7 | 54 ± 17 | 4 ± 2 | 9 ± 3 | 33 ± 16 | 1.5 ± 0.6 | 86 ± 3 | 10 ± 2 | 0 ± 0 | 2 ± 2 | 2 ± 2 |
| N. langsdorffii | 2.0 ± 0.9 | 3.4 ± 0.3 | 82 ± 7 | 3 ± 1 | 12 ± 5 | 3 ± 1 | 2.5 ± 0.2 | 78 ± 1 | 10 ± 2 | 0 ± 0 | 7 ± 2 | 5 ± 2 |
| N. palmeri | 0.1 ± 0.1 | 6.0 ± 3.2 | 57 ± 5 | 5 ± 5 | 22 ± 4 | 17 ± 7 | 6.7 ± 1.5 | 97 ± 0 | 2 ± 1 | 1 ± 1 | 0 ± 0 | 0 ± 0 |
| N. paniculata | 0.1 ± 0.1 | 1.7 ± 1.5 | 49 ± 2 | 12 ± 12 | 21 ± 10 | 18 ± 3 | 4.4 ± 2.0 | 95 ± 2 | 4 ± 1 | 4 ± 1 | 0 ± 0 | 0 ± 0 |
| N. rustica | 0.2 ± 0 | 1.7 ± 0.6 | 59 ± 8 | 24 ± 5 | 5 ± 2 | 12 ± 6 | 7.8 ± 4.0 | 94 ± 1 | 4 ± 1 | 4 ± 2 | 1 ± 0 | 1 ± 0 |
| N. tabacum | 0.4 ± 0.1 | 12.7 ± 1.9 | 96 ± 1 | 1 ± 1 | 1 ± 1 | 2 ± 1 | 9.3 ± 2.9 | 93 ± 4 | 5 ± 1 | 1 ± 0 | 1 ± 0 | 1 ± 1 |
| mean | 0.7 ± 0.2 | 4.9 ± 1 | 69 ± 7 | 9 ± 5 | 10 ± 4 | 12 ± 5 | 5.6 ± 1.7 | 91 ± 2 | 5 ± 1 | 2 ± 1 | 2 ± 1 | 2 ± 1 |
| night flowering | ||||||||||||
| N. acuminata | 0.4 ± 0.2 | 1.6 ± 0.4 | 46 ± 6 | 35 ± 5 | 7 ± 2 | 11 ± 3 | 6.1 ± 1.4 | 92 ± 1 | 6 ± 1 | 1 ± 0 | 1 ± 0 | 1 ± 0 |
| N. alata | 0.4 ± 0.1 | 7.9 ± 1.1 | 91 ± 5 | 1 ± 0 | 1 ± 1 | 4 ± 2 | 4.7 ± 0.8 | 95 ± 1 | 3 ± 1 | 1 ± 0 | 1 ± 0 | 1 ± 0 |
| N. benthamiana | 0.5 ± 0.2 | 19.2 ± 1.8 | 97 ± 1 | 1 ± 1 | 1 ± 1 | 1 ± 1 | 12.0 ± 1.6 | 91 ± 1 | 4 ± 1 | 0 ± 0 | 1 ± 0 | 4 ± 1 |
| N. longiflora | 0.1 ± 0 | 14.3 ± 2.5 | 98 ± 2 | 1 ± 1 | 0 ± 0 | 1 ± 1 | 12.4 ± 4.7 | 95 ± 2 | 2 ± 1 | 1 ± 0 | 2 ± 2 | 0 ± 0 |
| N. nesophila | 1.1 ± 0.1 | 17.1 ± 2.6 | 97 ± 0 | 0 ± 0 | 1 ± 0 | 2 ± 1 | 10.3 ± 4.4 | 90 ± 2 | 9 ± 2 | 3 ± 1 | 1 ± 0 | 0 ± 0 |
| N. otophora | 1.6 ± 0.6 | 6.1 ± 2.3 | 59 ± 5 | 39 ± 5 | 0 ± 0 | 1 ± 1 | 4.7 ± 0.7 | 97 ± 1 | 1 ± 0 | 0 ± 0 | 2 ± 0 | 0 ± 0 |
| N. plumbaginifolia | 0.2 ± 0.3 | 3.5 ± 4.2 | 93 ± 5 | 1 ± 1 | 3 ± 1 | 4 ± 4 | 1.9 ± 0.6 | 89 ± 2 | 8 ± 2 | 0 ± 0 | 1 ± 0 | 1 ± 1 |
| N. suaveolens | 0.3 ± 0.2 | 6.0 ± 1.2 | 84 ± 9 | 1 ± 1 | 10 ± 6 | 5 ± 3 | 14.0 ± 2.3 | 97 ± 0 | 2 ± 0 | 1 ± 0 | 1 ± 0 | 1 ± 0 |
| N. sylvestris | 0.4 ± 0.2 | 10.4 ± 1.8 | 94 ± 1 | 2 ± 1 | 1 ± 0 | 3 ± 1 | 9.1 ± 2.1 | 99 ± 0 | 0 ± 0 | 0 ± 0 | 1 ± 0 | 0 ± 0 |
| mean | 0.6 ± 0.2 | 10.2 ± 1.9 | 84 ± 4 | 9 ± 2 | 3 ± 1 | 4 ± 2 | 8.4 ± 2.2 | 94 ± 1 | 3 ± 1 | 1 ± 0 | 1 ± 0 | 1 ± 0 |