Table 2 Physiological parameters measured in the four pH treatments.

From: Morphological plasticity of the coral skeleton under CO2-driven seawater acidification

 

Units

7.20

7.40

7.80

8.0

F

P -value

Normalized by surface area

 Photosynthesis

μmol O2 h−1 cm−2

1.14±0.18

0.82±0.15

1.00±0.18

1.01±0.23

F3,36=0.988

0.409

 Respiration

μmol O2 h−1 cm−2

1.39±0.24

1.31±0.23

1.33±0.20

1.25±0.18

F3,36=0.072

0.974

 Protein

mg cm−2

1.18±0.12

0.91±0.11

0.95±0.11

0.97±0.10

F3,36=2,493

0.76

 Symbiont density

cells cm−2

2.11 × 106±1.68 × 105

1.78 × 106±1.68 × 105

1.50 × 106±1.78 × 105

2.14 × 106±2.03 × 105

F3,16=2.110

0.139

 Chla

μg cm−2

9.77±0.58

11.20±0.59

9.35±0.58

7.80±1.05

F3,16=1.710

0.205

 Chlc2

μg cm−2

2.01±0.16

2.27±0.16

1.63±0.16

1.74±0.12

F3,16=2.458

0.100

Normalized by protein

 Photosynthesis

μmol O2 h−1 mg−1

0.95±0.11

0.82±0.18

0.95±0.18

0.92±0.14

F3,48= 0.444

0.723

 Respiration

μmol O2 h−1 mg−1

1.03±0.21

1.40±0.36

1.45±0.21

1.24±0.12

F3,48= 0.554

0.648

 Symbiont density

Cell mg−1

2.12 × 106±1.53 × 105

1.82 × 106±1.72 × 105

1.71 × 106±1.54 × 105

2.56 × 106±1.58 × 105

F3,16=0.699

0.566

 Chla

μg mg−1

9.82±0.51

11.44±0.59

10.39±0.72

9.41±1.16

F3,16=0.851

0.486

 Chlc2

μg mg−1

2.01±0.14

2.02±0.16

2.20±0.18

2.34±0.24

F3,16=1.933

0.165

Normalized per symbiont cell

 Photosynthesis

μmol O2 h−1 cell−1

4.15 × 10−7±2.26 × 10−8

3.97 × 10−7±2.50 × 10−7

3.66 × 10−7±2.23 × 10−8

3.89 × 10−7±3.13 × 10−8

F3,16=2.493

0.967

 Chla

pg cell−1

4.69*±0.30

4.95*±0.28

5.03*±0.10

5.42±0.14

F3,16 =6,173

0.005

 Chlc2

pg cell−1

0.96±0.06

0.99±0.05

1.04±0.05

1.09±0.05

F3, 16=3,152

0.052

  1. Data are mean±s.e. Data were analysed by 1 way ANOVA.
  2. *Denotes mean values significantly different than the mean value from treatment with pH 8 (P<0.05).
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