Table 2 Soil accretion rates (cm yr⁻¹) and organic carbon (C_org) stocks (kg m⁻²) and accumulation rates (g m⁻² yr⁻¹) in Central Red Sea seagrass meadows (in 1 m-thick soils).

Core ID	Location	Seagrass species	Soil accretion rates (cm yr⁻¹)		Stock	Accumulation rates
Core ID	Location	Seagrass species	Mean	SE	(kg C_org m⁻²)	(g C_org m⁻² yr⁻¹)
T1	Thuwal	H. stipulacea	0.36	0.10	2.66	9.58
T2	Thuwal	H. stipulacea	n/a	n/a	2.94	n/a
T3	Thuwal	H. stipulacea	0.17	0.03	2.42	4.01
EC1	Economic city	T. hemprichii	0.40	n/a	5.39	21.57
EC2	Economic city	T. hemprichii	0.09	0.03	4.34	3.98
EC3	Economic city	T. hemprichii	0.10	n/a	4.62	4.41
EC4	Economic city	E. acoroides	0.10	0.01	4.10	4.25
EC5	Economic city	E. acoroides	0.02	0.01	4.17	0.81
EC6	Economic city	E. acoroides	0.05	0.00	2.60	1.29
EC7	Economic city	E. acoroides	0.08	0.01	4.24	3.20
EC8	Economic city	T. ciliatum	0.05	0.01	1.51	0.73
EC9	Economic city	T. ciliatum	0.06	0.02	2.73	1.70
EC10	Economic city	T. ciliatum	0.28	0.03	1.95	5.42
PR1	Petro Rabigh	T. ciliatum	n/a	n/a	1.96	n/a
PR2	Petro Rabigh	T. ciliatum	n/a	n/a	9.69	n/a
PR3	Petro Rabigh	T. ciliatum	1.06	n/a	2.43	25.74
PR4	Petro Rabigh	T. ciliatum	1.57	0.21	1.84	28.77
KA1	Khor Alkarar	H. uninervis	0.13	0.05	2.09	2.74
KA2	Khor Alkarar	H. uninervis	0.08	0.03	2.61	2.19
KA3	Khor Alkarar	H. uninervis	n/a	n/a	2.36	n/a
KA4	Khor Alkarar	H. stipulacea	0.06	n/a	2.26	1.39
KA5	Khor Alkarar	H. stipulacea	0.07	n/a	3.50	2.58
KA6	Khor Alkarar	H. stipulacea	n/a	n/a	3.09	n/a
KA7	Khor Alkarar	H. stipulacea	0.12	0.03	3.22	3.81
KA8	Khor Alkarar	H. stipulacea	0.27	0.02	3.93	10.81
KA9	Khor Alkarar	H. stipulacea	0.17	0.03	3.66	6.17
KA10	Khor Alkarar	H. uninervis	0.10	n/a	4.00	3.90
Mean			0.24	0.04	3.35	6.77

The C_org stocks were extrapolated to 1 m in 14 out of 27 cores studied (see methods section for further details). Mean ± SE values are reported. n/a indicates variables that were not measured.

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