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Table 4 Difference in O2 evolution of C. tomentosa with the addition of CaCl2, KCl, MgCl2 and NaCl referred to control (without addition)

From: Age and site-specific pattern on encrustation of charophytes

Addition1.22.43.64.86.07.28.4
CaCl22.1 ± 2.8 a0.1 ± 3.6 a− 1.2 ± 3.7 a− 1.2 ± 3.6 a− 1.3 ± 3.5 a− 1.0 ± 3.9 a− 0.2 ± 3.6 a
KCl− 1.0 ± 3.3 b0.0 ± 4.0 a1.4 ± 4.9 b1.4 ± 5.2 a1.1 ± 5.5 a0.9 ± 5.7 ab1.2 ± 5.9 a
MgCl2− 0.6 ± 2.3 b− 3.8 ± 2.3 b− 4.6 ± 2.9 c− 4.0 ± 3.6 b− 3.4 ± 4.2 b− 2.7 ± 4.3 bc− 1.7 ± 4.5 a
NaCl− 0.9 ± 3.7 b− 5.1 ± 5.5 b− 6.8 ± 5.4 c− 6.2 ± 5.8 b− 5.9 ± 5.6 b− 5.3 ± 5.9 c− 4.1 ± 5.6 b
  1. 1.2 mmol L−1 of CaCl2, KCl, MgCl2 and NaCl was added stepwise. O2 evolution (mmol O2 h−1 g chl a−1) is presented as accumulated concentrations (1.2, 2.4, 3.6, 4.8, 6.0, 7.2 and 8.4 mmol L−1). Sample size was n = 8 for the 20 min measurement of photosynthesis. Different letters indicate significant differences within a concentration level (Fischer LSD post hoc test, p < 0.05)