The O2, pH and Ca2+ Microenvironment of Benthic Foraminifera in a High CO2 World ...

• Main Authors: Glas, Martin S, Fabricius, Katharina Elisabeth, de Beer, Dirk, Uthicke, Sven, Gilbert, Jack Anthony
• Format: Dataset
• Language: English
• Published: PANGAEA 2012
• Subjects: Amphistegina radiata; Benthos; Bottles or small containers/Aquaria <20 L; Chromista; Coast and continental shelf; Foraminifera; Heterostegina depressa; Heterotrophic prokaryotes; Laboratory experiment; Marginopora vertebralis; Miliola sp.; Peneroplis sp.; Primary production/Photosynthesis; Quinquelloculina sp.; Single species; South Pacific; Tropical; Figure; Date; Identification; Treatment; Time point, descriptive; Species; Group; Individual code; Size; Position; Irradiance; Oxygen; Slope; Hydrogen ion concentration; Hydrogen ion concentration, standard deviation; Oxygen, standard deviation; Slope, standard deviation; Calcium ion; Salinity; Temperature, water; Temperature, water, standard deviation; Phosphate; Phosphate, standard deviation; Silicate; Silicate, standard deviation; pH; pH, standard deviation; Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Alkalinity, total; Alkalinity, total, standard deviation; Partial pressure of carbon dioxide water at sea surface temperature wet air; Partial pressure of carbon dioxide, standard deviation; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.833612; https://doi.pangaea.de/10.1594/PANGAEA.833612

Ocean acidification (OA) can have adverse effects on marine calcifiers. Yet, phototrophic marine calcifiers elevate their external oxygen and pH microenvironment in daylight, through the uptake of dissolved inorganic carbon (DIC) by photosynthesis. We studied to which extent pH elevation within their microenvironments in daylight can counteract ambient seawater pH reductions, i.e. OA conditions. We measured the O2 and pH microenvironment of four photosymbiotic and two symbiont-free benthic tropical foraminiferal species at three different OA treatments (~432, 1141 and 2151 µatm pCO2). The O2 concentration difference between the seawater and the test surface (delta O2) was taken as a measure for the photosynthetic rate. Our results showed that O2 and pH levels were significantly higher on photosymbiotic foraminiferal surfaces in light than in dark conditions, and than on surfaces of symbiont-free foraminifera. Rates of photosynthesis at saturated light conditions did not change significantly between OA ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne et al, 2014) 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 is 2014-06-19. ...