Table 4 Results of General Linear Models. Soil dry bulk density, soil accretion rates, organic carbon (Corg) concentration, stable carbon signatures (δ13C) of sedimentary organic matter, and sediment grain size fractions in response to Site (Thuwal Island, Economic City, Petro Rabigh and Khor Alkharar) and Seagrass species (Halophila stipulacea, Thalassia hemprichii, Enhalus acoroides, Thalassodendrum ciliatum and Halodule uninervis).

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

Variable

Factor

F

d.f.

P-value

Dry bulk density (g cm−3)

Site

25.771

2

<0.001

Seagrass spp.

17.010

3

<0.001

Soil accretion rates (cm yr−1)

Site

25.089

2

<0.001

Seagrass spp.

1.153

3

0.360

Corg (%)

Site

13.298

2

<0.001

Seagrass spp.

31.146

3

<0.001

Corg (mg cm−3)

Site

7.912

2

<0.001

Seagrass spp.

20.885

3

<0.001

Corg stock (kg m−2 in 1m-thick)

Site

1.375

2

0.276

Seagrass spp.

1.574

3

0.227

Corg accumulation rates (g m−2 yr−1)

Site

12.721

2

<0.01

Seagrass spp.

2.307

3

0.118

δ13C (‰)

Site

241.523

2

<0.001

Seagrass spp.

63.414

3

<0.001

<0.063 mm (%)

Site

11.291

2

<0.001

Seagrass spp.

55.494

3

<0.001

>0.063 <0.125 mm (%)

Site

169.449

2

<0.001

Seagrass spp.

57.760

3

<0.001

>0.125 <0.25 mm (%)

Site

135.947

2

<0.001

Seagrass spp.

34.330

3

<0.001

>0.25 <0.5 mm (%)

Site

58.551

2

<0.001

Seagrass spp.

11.601

3

<0.001

>0.5 <1 mm (%)

Site

283.002

2

<0.001

Seagrass spp.

72.341

3

<0.001

  1. The degrees of freedom (d.f.) for each term in the mixed model analysis are indicated.
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