10.1594/PANGAEA.924054
Osma, Natalia
Natalia
Osma
0000-0002-6537-8739
Latorre-Melín, Laura
Laura
Latorre-Melín
Jacob, Bárbara
Bárbara
Jacob
Contreras, Paulina Y
Paulina Y
Contreras
von Dassow, Peter
Peter
von Dassow
0000-0002-1858-1953
Vargas, Cristian A
Cristian A
Vargas
0000-0002-1486-3611
Seawater carbonate chemistry and phytoplankton community structure
PANGAEA
2020
Biomass/Abundance/Elemental composition
Coast and continental shelf
Community composition and diversity
Containers and aquaria (20-1000 L or < 1 m**2)
Entire community
Laboratory experiment
Pelagos
South Pacific
Temperate
Event label
Type
Location
Treatment
Day of experiment
Temperature, water
Salinity
pH
pH, standard deviation
Replicates
Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)
Partial pressure of carbon dioxide, standard deviation
Nitrogen/Phosphorus ratio
Nitrogen/Phosphorus ratio, standard deviation
Silicon/Nitrogen, molar ratio
Silicon/Nitrogen ratio, standard deviation
Chlorophyll a
Chlorophyll a, standard deviation
Cell density
Cell density, standard deviation
Abundance
Carbonate system computation flag
Carbon dioxide
Carbon dioxide, standard deviation
Fugacity of carbon dioxide (water) at sea surface temperature (wet air)
Fugacity of carbon dioxide in seawater, standard deviation
Bicarbonate ion
Bicarbonate ion, standard deviation
Carbonate ion
Carbonate ion, standard deviation
Carbon, inorganic, dissolved
Carbon, inorganic, dissolved, standard deviation
Alkalinity, total
Alkalinity, total, standard deviation
Aragonite saturation state
Aragonite saturation state, standard deviation
Calcite saturation state
Calcite saturation state, standard deviation
Experiment
Calculated using seacarb after Nisumaa et al. (2010)
Calculated using seacarb after Orr et al. (2018)
Ocean Acidification International Coordination Centre (OA-ICC)
Yang, Yan
Yan
Yang
0000-0003-4900-5606
Dataset
10.3389/fmars.2020.00323
https://CRAN.R-project.org/package=seacarb
1224 data points
text/tab-separated-values
Creative Commons Attribution 4.0 International
The interplay of coastal oceanographic processes usually results in partial pressures of CO2 (pCO2) higher than expected from the equilibrium with the atmosphere and even higher than those expected by the end of the century. Although this is a well-known situation, the natural variability of seawater chemistry at the locations from which tested organisms or communities originate is seldom considered in ocean acidification experiments. In this work, we aimed to evaluate the role of the carbonate chemistry dynamics in shaping the response of coastal phytoplankton communities to increased pCO2 levels. The study was conducted at two coastal ecosystems off Chile, the Valdivia River estuary and the coastal upwelling ecosystem in the Arauco Gulf. We characterized the seasonal variability (winter/summer) of the hydrographic conditions, the carbonate system parameters, and the phytoplankton community structure at both sites. The results showed that carbonate chemistry dynamics in the estuary were mainly related to seasonal changes in freshwater discharges, with acidic and corrosive conditions dominating in winter. In the Arauco Gulf, these conditions were observed in summer, mainly associated with the upwelling of cold and high pCO2 (>1,000 μatm) waters. Diatoms dominated the phytoplankton communities at both sites, yet the one in Valdivia was more diverse. Only certain phytoplankton groups in this latter ecosystem showed a significant correlations with the carbonate system parameters. When the impact of elevated pCO2 levels was investigated by pCO2 manipulation experiments, we did not observe any significant effect on the biomass of either of the two communities. Changes in the phytoplankton species composition and abundance during the incubations were related to other factors, such as competition and growth phases. Our findings highlight the importance of the natural variability of coastal ecosystems and the potential for local adaptation in determining responses of coastal phytoplankton communities to increased pCO2 levels.
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 2020-10-20.
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