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Table 6 Photosynthetic responses of experimental specimens of M. stellatus and C. crispus: amplitudes of the maximum quantum yield (Fv/Fm) for the high-light stress phase and the recovery phase of thallus branches collected on four sampling events (October 2011, March 2012, May 2012 and August 2012)

From: Fatty acid compositions associated with high-light tolerance in the intertidal rhodophytes Mastocarpus stellatus and Chondrus crispus

Fv/Fm amplitudes of thallus branches Sampling event
October 2011 March 2012 May 2012 August 2012
High-light stress phase
 Mast-ex 0.124 ± 0.026c 0.059 ± 0.014a 0.181 ± 0.023a 0.193 ± 0.026b
 Mast-ov 0.197 ± 0.024b 0.044 ± 0.017a 0.234 ± 0.027a 0.112 ± 0.026c
 Chon-ov 0.292 ± 0.033a 0.038 ± 0.011a 0.219 ± 0.027a 0.270 ± 0.035a
Recovery phase
 Mast-ex 0.135 ± 0.028 0.024 ± 0.013 0.069 ± 0.022 0.080 ± 0.036
 Mast-ov 0.200 ± 0.024 0.035 ± 0.013 0.188 ± 0.028 0.081 ± 0.025
 Chon-ov 0.128 ± 0.063 0.024 ± 0.007 0.145 ± 0.024 0.191 ± 0.048
  1. For this, differences between the beginning and end of the high-light stress phase (beginning of experiment and 120 min of high-light exposure) and the recovery phase (120 min of high-light exposure and 120 min of recovery) were calculated from absolute Fv/Fm values, respectively. Table shows mean ± SEM (n = 5). Different letters (a, b and c) indicate significant differences among algal isolates within one of the four sampling events (significant interaction isolate × sampling event of 2-way ANOVA followed by a Fisher’s LSD test, p < 0.05)
  2. Mast-ex, Mastocarpus stellatus from higher levels of the lower intertidal; Mast-ov, Mastocarpus stellatus from overlapping zone in deeper levels of lower intertidal; Chon-ov, Chondrus crispus from overlapping zone in deeper levels of lower intertidal; SEM, standard error of the mean