Publication Date:
2024-03-15
Description:
Oceanic dimethyl sulfide (DMS) is the enzymatic cleavage product of the algal metabolite dimethylsulfoniopropionate (DMSP) and is the most abundant form of sulfur released into the atmosphere. To investigate the effects of two emerging environmental threats (ocean acidification and warming) on marine DMS production, we performed a large-scale perturbation experiment in a coastal environment. At both ambient temperature and 2 °C warmer, an increase in partial pressure of carbon dioxide (pCO2) in seawater (160-830 ppmv pCO2) favored the growth of large diatoms, which outcompeted other phytoplankton species in a natural phytoplankton assemblage and reduced the growth rate of smaller, DMSP-rich phototrophic dinoflagellates. This decreased the grazing rate of heterotrophic dinoflagellates (ubiquitous micrograzers), resulting in reduced DMS production via grazing activity. Both the magnitude and sign of the effect of pCO2 on possible future oceanic DMS production were strongly linked to pCO2-induced alterations to the phytoplankton community and the cellular DMSP content of the dominant species and its association with micrograzers.
Keywords:
19-Hexanoyloxyfucoxanthin; Alexandrium sp.; Alkalinity, total; Alloxanthin; Ammonia; Aragonite saturation state; Behaviour; Bicarbonate ion; Biomass; Calcite saturation state; Calculated; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, organic, dissolved; Carbon, organic, particulate; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Cell density; Cerataulina pelagica; Chlorophyll a; Chlorophyll b; Coast and continental shelf; Community composition and diversity; Date; Dimethyl sulfide; Dimethylsulfoniopropionate, particulate; Dimethylsulfoniopropionate lyase activity; Dimethylsulfoniopropionate lyase activity, standard deviation; Entire community; EXP; Experiment; Field experiment; Fucoxanthin; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Grazing rate; Grazing rate, standard error; Identification; Incubation duration; Jangmok; Mesocosm or benthocosm; Nitrate and Nitrite; North Pacific; OA-ICC; Ocean Acidification International Coordination Centre; Other metabolic rates; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; Peridinin; pH; Phosphate; Primary production/Photosynthesis; Salinity; Silicate; Species; Temperate; Temperature; Temperature, water; Treatment; Zeaxanthin
Type:
Dataset
Format:
text/tab-separated-values, 29214 data points
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