Seawater carbonate chemistry and photosynthetic rates of macroalgae ...

• Main Authors: Cornwall, Christopher Edward, Hurd, Catriona L
• Format: Dataset
• Language: English
• Published: PANGAEA 2019
• Subjects: Benthos; Coast and continental shelf; Containers and aquaria 20-1000 L or < 1 m**2; Heminuera frondosa; Laboratory experiment; Macroalgae; Plantae; Plocamium angustum; Primary production/Photosynthesis; Rhodophyta; Rhodymenia sp.; Single species; South Pacific; Temperate; Type; Species; Registration number of species; Uniform resource locator/link to reference; Treatment; Photosynthetic rate, oxygen, per dry mass; Photosynthetic quotient; Dissolved inorganic carbon uptake rate; Partial pressure of carbon dioxide water at sea surface temperature wet air; Temperature, water; Salinity; pH; pH, standard deviation; Alkalinity, total; Alkalinity, total, standard deviation; Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Partial pressure of carbon dioxide, standard deviation; Carbon dioxide; Carbon dioxide, standard deviation; Bicarbonate ion; Bicarbonate ion, standard deviation; Carbonate system computation flag; Fugacity of carbon dioxide water at sea surface temperature wet air; Carbonate ion; Aragonite saturation state; Calcite saturation state; Experiment; Calculated using seacarb after Nisumaa et al. 2010; Ocean Acidification International Coordination Centre OA-ICC; Pacific; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.912280; https://doi.pangaea.de/10.1594/PANGAEA.912280

Increasing concentrations of surface-seawater carbon dioxide (CO2) (ocean acidification) could favour seaweed species that currently are limited for dissolved inorganic carbon (DIC). Among them, those that are unable to use CO2-concentrating mechanisms (CCMs) to actively uptake bicarbonate (HCO3–) across the plasmalemma are most likely to benefit. Here, we assess how the DIC uptake and photosynthetic rates of three rhodophytes without CCMs respond to four seawater CO2 concentrations representing pre-industrial (280 μatm), present-day (400 μatm), representative concentration pathway (RCP) emissions scenario 8.5 2050 (650 μatm) and RCP 8.5 2100 (1000 μatm). We demonstrated that the photosynthetic rates of only one species increase between the preindustrial and end-of-century scenarios, but because of differing photosynthetic quotients (DIC taken up relative to O2 evolved), all three increase their DIC uptake rates from pre-industrial or present-day scenarios to the end-of-century scenario. These variable, but ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2019) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation by seacarb is 2020-02-17. ...