Table 4.
Underwater dark respiration (RD) (µmol O2 m−2 s−1) of succulent stems of Tecticornia auriculata and Tecticornia medusa measured as O2 uptake in artificial lake water after four submergence durations (0, 3, 6 and 12 d)
| Species | #0 d | 3 d | 6 d | 12 d |
|---|---|---|---|---|
| T. auriculata | 0·90 ± 0·02 c | 0·77 ± 0·07b | 0·52 ± 0·04b | 0·39 ± 0·04b |
| T. auriculata (Triton X-100) | 0·55 ± 0·07b | 0·78 ± 0·11b | n.m. | n.m. |
| T. medusa | 0·27 ± 0·01a | 0·42 ± 0·06a | 0·33 ± 0·02a | 0·23 ± 0·02a |
| T. medusa (Triton X-100) | 0·28 ± 0·02a | 0·39 ± 0·04a | n.m. | n.m. |
The medium was near to air-equilibrium dissolved O2 and contained 40 µm CO2. Some stems were brushed with 0·05 % (v/v) Triton X-100 solution to remove gas films in the 0 and 3 d submergence treatments. Different letters indicate significant differences between rows using ANOVA and Tukey’s HSD post-hoc test (P < 0·05). Values are means ± s.e. (n = 4). #0 days refers to measurements taken as soon as stems were first submerged; n.m. = not measured.