Acidification and irradiance effect on the photo-physiological fitness, growth and carbon production of the Antarctic cryptophyte Geminigera cryophila, supplement to: Trimborn, Scarlett; Thoms, Silke; Karitter, Pascal; Bischof, Kai (2019): Ocean acidification and high irradiance stimulate growth of the Antarctic cryptophyte Geminigera cryophila. Biogeosciences, 16, 2997–3008

• Main Author: Trimborn, Scarlett
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2019
• Subjects: cryptophytes; irradiance; Ocean acidification; Southern Ocean; Type; Species; Registration number of species; Uniform resource locator/link to reference; Treatment light intensity; Treatment partial pressure of carbon dioxide; Phytoplankton growth rate; Growth rate, standard deviation; Carbon, organic, particulate, per cell; Carbon, organic, particulate, standard deviation; Production of particulate organic carbon per cell; Particulate organic carbon, production, standard deviation; Nitrogen, organic, particulate, per cell; Nitrogen, organic, particulate, per cell, standard deviation; Production of particulate organic nitrogen; Particulate organic nitrogen production, standard deviation; Carbon/Nitrogen ratio; Carbon/Nitrogen ratio, standard deviation; Maximum photochemical quantum yield of photosystem II; Maximum photochemical quantum yield of photosystem II, standard deviation; Recovery; Standard deviation; Functional photosystem II reaction centers; Functional photosystem II reaction centers, standard deviation; Connectivity between photosystem II; Connectivity between photosystem II, standard deviation; Functional absorption cross sections of photosystem II reaction centers; Functional absorption cross sections of photosystem II reaction centers, standard deviation; Re-oxidation time of the Qa acceptor; Re-oxidation time of the Qa acceptor, standard deviation; Irradiance; Electron transport rate, absolute; Electron transport rate, absolute, standard deviation; Non photochemical quenching; Non photochemical quenching, standard deviation; Antarctic; The Antarctic; Antarc*
• Online Access: https://dx.doi.org/10.1594/pangaea.904010; https://doi.pangaea.de/10.1594/PANGAEA.904010

Ecophysiological studies on Antarctic cryptophytes to assess whether climatic changes such as ocean acidification and enhanced stratification affect their growth in Antarctic coastal waters in the future are lacking so far. This is the first study that investigates the combined effects of the increasing availability of pCO2 (400 and 1000 μatm) and irradiance (20, 200 and 500 μmol photons m-2 s-1) on growth, elemental composition and photo-physiology of the Antarctic cryptophyte Geminigera cryophila. Under ambient pCO2, this species was characterized by a pronounced sensitivity to increasing irradiance with complete growth inhibition at the highest light intensity. Interestingly, when grown under high pCO2 this negative light effect vanished, and it reached the highest rates of growth and particulate organic carbon production at the highest irradiance compared to the other tested experimental conditions. Our results for G. cryophila reveal beneficial effects of ocean acidification in conjunction with enhanced irradiance on growth and photosynthesis. Hence, cryptophytes such as G. cryophila may be potential winners of climate change, potentially thriving better in more stratified and acidic coastal waters and contributing in higher abundance to future phytoplankton assemblages of coastal Antarctic waters. : #999: not grown