Table 4.

Comparison of literature values for DOC exudation by seagrasses expressed as rates and as a percentage of gross primary production (GPP)

Seagrass	Exudation rates (mg C gdw-1 h-1)	Leaves (%)	Rhizome/Root (%)	Source
Thalassia testudinum	0.035 – 0.125			[26]a
		1	15-30	[55]
			~1	[14]
	0.019 ± 0.003b	1.3		[13]
T. hemprichii			5.4	[20]
Halodule wrightii		1	6-17	[21]
	0.022 ± 0.008b			[13]
Posidonia oceanica	0.022	1.9		[25]
	0.007 - 0.02			[19]c
Cymodocea rotundata			7	[20]
Cymodocea nodosa	0.057			[17]
Zostera marina		2		[15]
		0.2	2.2	[14]
	0.015 ± 0.006b			[59]
	0.032 -0.069	0.6 -4.2		leaf
	0.024 – 0.045		0.6 – 2.4	rhizome

^a DOC flux from [26], above ground biomass ~100 gdw m^-2 from [49].

^b mean ± SD.

^c values based on conversion of annualized (4360 mmols C m^-2 y^-1) and June (34.7 mmols C m^-2 d^-1) fluxes.