Table 1 Average ± standard error (SE) of (a) dry bulk density (in g cm−3), organic carbon (Corg) content (in % and mg cm−3), δ13C signatures of soil organic matter and (b) sediment grain-size content at Red Sea seagrass soil cores (for the total length of core sampled; see Supporting Information Table B for further details).

From: Carbon stocks and accumulation rates in Red Sea seagrass meadows

(a) Core ID

Seagrass spp.

Dry bulk density (g cm−3)

Corg (%)

Corg (mg cm−3)

δ13C (‰)

N

Mean

SE

N

Mean

SE

Mean

SE

Mean

SE

T1

H. stipulacea

117

1.26

0.01

68

0.24

0.02

2.98

0.17

−18.61

0.35

T2

H. stipulacea

17

1.18

0.04

17

0.24

0.02

2.96

0.40

−18.41

0.48

T3

H. stipulacea

20

1.05

0.02

20

0.27

0.02

2.82

0.21

−17.78

0.55

EC1

T. hemprichii

8

0.69

0.05

8

0.80

0.05

5.38

0.37

−11.95

0.64

EC2

T. hemprichii

42

0.64

0.03

31

0.72

0.03

4.45

0.15

−10.91

0.19

EC3

T. hemprichii

8

0.94

0.05

8

0.50

0.06

4.61

0.45

−11.45

0.10

EC4

E. acoroides

18

0.73

0.02

18

0.57

0.04

4.09

0.18

−11.63

0.19

EC5

E. acoroides

136

0.93

0.02

77

0.45

0.03

3.75

0.19

−13.08

0.20

EC6

E. acoroides

105

0.92

0.01

61

0.32

0.02

2.65

0.14

−13.22

0.08

EC7

E. acoroides

20

1.10

0.04

20

0.40

0.06

3.99

0.39

−11.31

0.31

EC8

T. ciliatum

7

0.96

0.03

7

0.16

0.04

1.52

0.40

−14.14

0.18

EC9

T. ciliatum

7

0.89

0.09

7

0.36

0.10

2.74

0.32

−14.82

0.48

EC10

T. ciliatum

47

1.05

0.03

33

0.21

0.03

2.40

0.31

−15.43

0.24

PR1

T. ciliatum

164

1.14

0.01

92

0.14

0.01

1.61

0.07

−23.00

0.19

PR2

T. ciliatum

13

0.91

0.03

13

0.95

0.24

9.03

2.33

−22.94

0.35

PR3

T. ciliatum

15

1.02

0.01

15

0.18

0.02

1.89

0.17

−22.47

0.56

PR4

T. ciliatum

16

1.00

0.02

16

0.24

0.04

2.31

0.33

−22.91

0.31

KA1

H. uninervis

120

1.35

0.01

70

0.17

0.01

2.26

0.13

−14.13

0.13

KA2

H. uninervis

18

1.13

0.02

18

0.22

0.01

2.52

0.13

−14.44

0.06

KA3

H. uninervis

7

0.93

0.04

7

0.26

0.02

2.37

0.09

−14.30

0.16

KA4

H. stipulacea

6

0.80

0.04

6

0.29

0.04

2.30

0.28

−13.97

0.11

KA5

H. stipulacea

10

0.95

0.06

10

0.38

0.05

3.48

0.35

−15.11

0.13

KA6

H. stipulacea

9

0.85

0.07

9

0.39

0.06

3.05

0.33

−15.28

0.25

KA7

H. stipulacea

60

0.96

0.02

40

0.37

0.02

3.33

0.14

−14.81

0.09

KA8

H. stipulacea

10

0.96

0.07

10

0.42

0.03

3.96

0.23

−13.92

0.10

KA9

H. stipulacea

56

0.86

0.02

38

0.45

0.01

3.76

0.12

−14.23

0.05

KA10

H. uninervis

9

0.94

0.06

9

0.44

0.03

4.02

0.21

−14.03

0.05

Total

 

1065

1.05

0.01

728

0.33

0.01

3.05

0.07

−16.02

0.15

(b) Core ID

N

<0.063 mm

>0.063 <0.125 mm

>0.125 <0.25 mm

>0.25 <0.5 mm

>0.5 <1 mm

Mean

SE

Mean

SE

Mean

SE

Mean

SE

Mean

SE

T1

56

44.0

2.6

34.2

1.5

17.7

0.9

2.7

0.2

1.4

0.2

T2

13

44.2

3.8

35.7

2.1

17.9

1.5

1.6

0.3

0.5

0.2

T3

14

42.7

3.2

33.8

1.5

16.2

1.1

5.2

0.6

2.1

0.4

EC1

8

52.3

3.1

22.4

0.7

8.7

0.6

8.4

1.1

8.1

2.3

EC2

31

44.2

0.7

25.3

0.8

12.7

0.4

9.4

0.4

8.4

0.7

EC3

8

21.7

1.0

19.7

0.6

20.5

0.5

19.0

0.4

19.1

1.0

EC4

14

40.42

2.0

16.8

0.5

11.8

0.5

13.8

0.5

17.2

1.4

EC5

53

52.3

1.3

16.5

0.4

10.2

0.3

10.4

0.5

10.6

0.8

EC6

55

38.6

0.9

13.8

0.4

10.5

0.3

16.0

0.4

21.2

0.9

EC7

16

30.6

1.9

12.0

1.1

8.9

0.4

16.9

0.7

31.6

2.7

EC8

7

6.3

2.5

2.5

0.7

2.8

0.9

22.3

1.8

66.0

5.3

EC9

7

21.1

4.1

7.0

1.6

4.2

0.8

19.5

1.8

48.2

5.0

EC10

33

11.2

1.6

4.7

0.7

3.9

0.4

20.9

0.7

59.3

2.7

PR1

49

31.6

2.6

35.6

1.4

28.2

1.3

4.5

0.5

0.1

0.0

PR2

11

15.1

2.5

28.6

1.2

37.1

1.4

15.2

1.5

4.0

0.7

PR3

12

26.1

4.6

32.5

1.2

31.3

2.8

9.1

1.5

1.0

0.3

PR4

13

29.5

5.1

35.2

2.6

27.5

2.5

6.3

1.0

1.4

0.3

KA1

54

10.8

0.4

18.6

0.3

29.9

0.5

24.1

0.2

16.5

0.7

KA2

15

26.7

1.0

15.1

0.6

15.9

0.4

19.8

0.6

22.5

1.3

KA3

7

32.8

1.5

16.0

0.5

13.3

0.4

17.1

0.9

20.8

1.1

KA4

6

40.6

3.1

17.2

1.0

11.0

0.3

13.6

1.4

17.6

2.4

KA5

10

44.8

1.9

14.4

0.7

10.0

0.3

14.0

0.8

16.8

1.9

KA6

9

46.1

3.8

14.1

1.3

9.1

0.4

13.3

1.5

17.5

3.3

KA7

40

43.7

0.9

15.0

0.3

11.6

0.3

13.7

0.3

16.0

0.6

KA8

10

57.0

1.4

21.2

0.8

8.3

0.3

6.8

0.5

6.7

1.5

KA9

38

60.8

1.1

20.0

0.3

8.5

0.2

6.1

0.4

4.7

0.6

KA10

9

61.5

1.6

21.0

0.7

8.4

0.4

5.7

0.9

3.3

1.1

Total

598

36.8

0.7

21.1

0.4

15.6

0.4

12.0

0.3

14.4

0.7

  1. The total number of data (N) provides an indication of the core length. Cores T1 to T3 were sampled at Thuwal Island, cores EC1 to EC10 at Economic city, cores PR1 to PR4 at Petro Rabigh and cores KA1 to KA10 at Khor Alkarar.
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