Fig 1.
Simplified diagram of the open-water mesocosm system.
Table 1.
Daily water properties in the two large reservoirs at different times across the experimental period.
Table 2.
Summary of seawater chemistry in the different treatments.
Fig 2.
Effects of seawater acidification and current velocity on (A) gross primary production (GPP), (B) respiration (R) and (C) net primary production (NPP). LV = Low velocity, MV = Medium velocity, HV = High velocity, CpH = Current pH, FpH = Forecasted pH.
Table 3.
Two-way ANOVA results for the effect of seawater acidification and current velocity (CV) on gross primary production (GPP), respiration (R), net primary production (NPP), dissolved organic carbon flux (DOC) and biomass loss (BL).
Fig 3.
Effects of seawater acidification and current velocity on (A) aboveground sucrose, (B) belowground sucrose, (C) aboveground starch and (D) belowground starch. LV = Low velocity, MV = Medium velocity, HV = High Velocity, CpH = Current pH, FpH = Forecasted pH.
Table 4.
Two-way ANOVA results for the effect of seawater acidification and current velocity (CV) on aboveground sucrose, belowground sucrose, aboveground starch and belowground starch (mg sucrose or starch g DW-1).
Fig 4.
Effects of seawater acidification and current velocity on net DOC flux.
LV = Low velocity, MV = Medium velocity, HV = High velocity, CpH = Current pH, FpH = Forecasted pH.
Fig 5.
Conceptual model showing the likely effects of CO2 concentration, current velocity and shoot density on gross production (GPP) and respiration (R).
(↑) Increase, () Decrease, (↑↑) Significant increase. Current pH means the actual sea pH (pH = 8.1). Forecasted pH means the ocean acidification scenario forecasted by the Intergovernmental Panel on Climate Change (pH = 7.65).
Fig 6.
Relationship between current velocity and DOC flux.
CpH = Current pH, FpH = Forecasted pH.