318
R. C. Zimmerman
Fig. 10. Relationship between seagrass photosynthesis and seawater pH derived from manipulation of dissolved aqueous CO 2 concentrations. Redrawn from Invers et al. (2001).
Doubled CO 2 Atmosphere
(pH = 7.74)
Present Day CO 2
(pH 8.2)
110 to 150 shoots m
-2
<110 shoots m -2
Existing Beds (110 shoots m -2 )
>150 shoots m -2
CO 2 Saturating
(pH = 6.2)
17 ha > 110 shoots m -2
23 ha > 110 shoots m -2
63 ha > 110 shoots m -2
Doubled CO 2 Atmosphere
(pH = 7.74)
Present Day CO 2
(pH 8.2)
110 to 150 shoots m
-2
<110 shoots m -2
Existing Beds (110 shoots m -2 )
>150 shoots m -2
CO 2 Saturating
(pH = 6.2)
17 ha > 110 shoots m -2
23 ha > 110 shoots m -2
63 ha > 110 shoots m -2
Doubled CO 2 Atmosphere
(pH = 7.74)
Present Day CO 2
(pH 8.2)
110 to 150 shoots m
-2
<110 shoots m -2
Existing Beds (110 shoots m -2 )
>150 shoots m -2
110 to 150 shoots m
-2
<110 shoots m -2
Existing Beds (110 shoots m -2 )
>150 shoots m -2
CO 2 Saturating
(pH = 6.2)
17 ha > 110 shoots m -2
23 ha > 110 shoots m -2
63 ha > 110 shoots m -2
Fig. 11. Predicted effect of increased ambient CO 2 concentrations on eelgrass distributions in Elkhorn Slough, California, USA. Seal
Bend is the ∩-shaped region in the middle of the channel. Elkhorn Slough drains westward into Monterey Bay (left side) from an upland
watershed to the east (right side). From Zimmerman and Palacios (2002).