Physiological responses of coastal and oceanic diatoms to diurnal fluctuations in seawater carbonate chemistry under two CO2 concentrations ...

• Main Authors: Li, Futian, Wu, YaPing, Hutchins, David A, Fu, Feixue, Gao, Kunshan
• Format: Dataset
• Language: English
• Published: PANGAEA 2016
• Subjects: Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria <20 L; Chromista; Growth/Morphology; Laboratory experiment; Laboratory strains; North Atlantic; Ochrophyta; Other; Pelagos; Phytoplankton; Primary production/Photosynthesis; Respiration; Single species; Thalassiosira oceanica; Thalassiosira weissflogii; Type; Species; Registration number of species; Uniform resource locator/link to reference; Figure; Table; Time in hours; Treatment; pH; pH, standard deviation; Growth rate; Growth rate, standard deviation; Chlorophyll a production per cell; Chlorophyll a, production, standard deviation; Carbon, organic, particulate, production per cell; Particulate organic carbon, production, standard deviation; Production of particulate organic nitrogen; Particulate organic nitrogen production, standard deviation; Biogenic silica production per cell; Biogenic silica production, standard deviation; Net photosynthesis rate, oxygen, per chlorophyll a; Net photosynthesis rate, standard deviation; Net photosynthesis rate, oxygen, per cell; Respiration rate, oxygen, per cell; Respiration rate, oxygen, standard deviation; Cell size; Cell size, standard deviation; Chlorophyll a per cell; Chlorophyll a, standard deviation; Particulate organic carbon, per cell; Particulate organic carbon content per cell, standard deviation; Particulate organic nitrogen per cell; Particulate organic nitrogen, standard deviation; Biogenic silica, per cell; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.868779; https://doi.pangaea.de/10.1594/PANGAEA.868779

Diel and seasonal fluctuations in seawater carbonate chemistry are common in coastal waters, while in the open-ocean carbonate chemistry is much less variable. In both of these environments, ongoing ocean acidification is being superimposed on the natural dynamics of the carbonate buffer system to influence the physiology of phytoplankton. Here, we show that a coastal Thalassiosira weissflogii isolate and an oceanic diatom, Thalassiosira oceanica, respond differentially to diurnal fluctuating carbonate chemistry in current and ocean acidification (OA) scenarios. A fluctuating carbonate chemistry regime showed positive or negligible effects on physiological performance of the coastal species. In contrast, the oceanic species was significantly negatively affected. The fluctuating regime reduced photosynthetic oxygen evolution rates and enhanced dark respiration rates of T. oceanica under ambient CO2 concentration, while in the OA scenario the fluctuating regime depressed its growth rate, chlorophyll a content, ... : 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 is 2016-11-24. ...