Interactive effects of warming and ocean acidification on the Arctic picoeukaryote Micromonas pusilla ...

• Main Authors: Hoppe, Clara Jule Marie, Flintrop, Clara, Rost, Björn
• Format: Dataset
• Language: English
• Published: PANGAEA 2018
• Subjects: Arctic; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria <20 L; Chlorophyta; Coast and continental shelf; Growth/Morphology; Laboratory experiment; Micromonas pusilla; Pelagos; Phytoplankton; Plantae; Polar; Primary production/Photosynthesis; Single species; Temperature; Type; Species; Registration number of species; Uniform resource locator/link to reference; Temperature, water; Partial pressure of carbon dioxide water at sea surface temperature wet air; Identification; Growth rate; Division rate constant; Chlorophyll a per cell; Carbon, organic, particulate, per cell; Particulate organic nitrogen per cell; Carbon/Nitrogen ratio; Carbon, organic, particulate/chlorophyll a ratio; Carbon, organic, particulate, production per cell; Photochemical quantum yield; Functional absorption cross section; Photosystem II re-opening rate; Non photochemical quenching, maximum; Maximum light use efficiency; Maximal absolute electron transfer rate; Saturation light intensity; pH; Alkalinity, total; Carbon, inorganic, dissolved; Carbon dioxide; Salinity; Temperature, water, standard deviation; Carbonate system computation flag; Fugacity of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbonate ion; Aragonite saturation state; Calcite saturation state; Calculated using seacarb after Nisumaa et al. 2010; Arctic Ocean; Climate change; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.892370; https://doi.pangaea.de/10.1594/PANGAEA.892370

In the Arctic Ocean, climate change effects such as warming and ocean acidification (OA) are manifesting faster than in other regions. Yet, we are lacking a mechanistic understanding of the interactive effects of these drivers on Arctic primary producers. In the current study, one of the most abundant species of the Arctic Ocean, the prasinophyte Micromonas pusilla, was exposed to a range of different pCO2levels at two temperatures representing realistic scenarios for current and future conditions. We observed that warming and OA synergistically increased growth rates at intermediate to high pCO2 levels. Furthermore, elevated temperatures shifted the pCO2-optimum of biomass production to higher levels. Based on changes in cellular composition and photophysiology, we hypothesise that the observed synergies can be explained by beneficial effects of warming on carbon fixation in combination with facilitated carbon acquisition under OA. Our findings help to understand the higher abundances of picoeukaryotes such ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2016) 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 2018-07-12. ...