Macroalgal responses to ocean acidification depend on nutrient and light levels ...

• Main Authors: Celis-Plá, Paula S M, Hall-Spencer, Jason M, Horta, Paulo Antunes, Milazzo, Marco, Korbee, Nathalie, Cornwall, Christopher Edward, Figueroa, Félix L
• Format: Dataset
• Language: English
• Published: PANGAEA 2015
• Subjects: Benthos; Biomass/Abundance/Elemental composition; Chromista; CO2 vent; Coast and continental shelf; Cystoseira compressa; Field experiment; Macroalgae; Macro-nutrients; Mediterranean Sea; Ochrophyta; Padina pavonica; Primary production/Photosynthesis; Single species; Temperate; Temperature; Species; Treatment; Nitrogen, per dry mass; Nitrogen content per dry mass, standard error; Carbon/Nitrogen ratio; Carbon/Nitrogen ratio, standard error; Maximum photochemical quantum yield of photosystem II; Maximum photochemical quantum yield of photosystem II, standard error; Phenolics, all; Phenolics, all, standard error; Carbon, per dry mass; Carbon content per dry mass, standard error; Photosynthetic efficiency; Photosynthetic efficiency, standard error; Electron transport rate; Electron transport rate, standard error; Light saturation point; Light saturation point, standard error; Non photochemical quenching; Non photochemical quenching, standard error; Chlorophyll a; Chlorophyll a, standard error; Chlorophyll c; Chlorophyll c, standard error; Fucoxanthin; Fucoxanthin, standard error; Violaxanthin; Violaxanthin, standard error; Antioxidant activity; Antioxidant activity, standard error; Salinity; Salinity, standard error; Temperature, water; Temperature, water, standard error; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.848718; https://doi.pangaea.de/10.1594/PANGAEA.848718

Ocean acidification may benefit algae that are able to capitalize on increased carbon availability for photosynthesis, but it is expected to have adverse effects on calcified algae through dissolution. Shifts in dominance between primary producers will have knock-on effects on marine ecosystems and will likely vary regionally, depending on factors such as irradiance (light vs. shade) and nutrient levels (oligotrophic vs. eutrophic). Thus experiments are needed to evaluate interactive effects of combined stressors in the field. In this study, we investigated the physiological responses of macroalgae near a CO2 seep in oligotrophic waters off Vulcano (Italy). The algae were incubated in situ at 0.2 m depth using a combination of three mean CO2 levels (500, 700-800 and 1200 µatm CO2), two light levels (100 and 70% of surface irradiance) and two nutrient levels of N, P, and K (enriched vs. non-enriched treatments) in the non-calcified macroalga Cystoseira compressa (Phaeophyceae, Fucales) and calcified Padina ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2015) 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 2015-08-17. ...