Table 4 Comparison of literature values for DOC exudation by seagrasses expressed as rates and as a percentage of gross primary production (GPP)

Thalassia testudinum

0.035 – 0.125

[26]^a

1

15-30

[55]

~1

[14]

0.019 ± 0.003^b

1.3

[13]

T. hemprichii

5.4

[20]

Halodule wrightii

1

6-17

[21]

0.022 ± 0.008^b

[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 ± 0.006^b

[59]

0.032 -0.069

0.6 -4.2

leaf

0.024 – 0.045

0.6 – 2.4

rhizome