Ocean acidification decreases the light-use efficiency in an Antarctic diatom under dynamic but not constant light, link to supplementary data ...

• Main Authors: Hoppe, Clara Jule Marie, Holtz, Lena-Maria, Trimborn, Scarlett, Rost, Björn
• Format: Dataset
• Language: English
• Published: PANGAEA 2015
• Subjects: Antarc*; Antarctic; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.842808; https://doi.pangaea.de/10.1594/PANGAEA.842808

There is increasing evidence that different light intensities strongly modulate the effects of ocean acidification (OA) on marine phytoplankton. The aim of the present study was to investigate interactive effects of OA and dynamic light, mimicking natural mixing regimes.The Antarctic diatom Chaetoceros debilis was grown under two pCO2 (390 and 1000 latm) and light conditions (constant and dynamic), the latter yielding the same integrated irradiance over the day. To characterize interactive effects between treatments, growth, elemental composition, primary production and photophysiology were investigated.Dynamic light reduced growth and strongly altered the effects of OA on primary production, being unaffected by elevated pCO2 under constant light, yet significantly reduced under dynamic light. Interactive effects between OA and light were also observed for Chl production and particulate organic carbon (POC) quotas.Response patterns can be explained by changes in the cellular energetic balance. While the ... : Supplement to: Hoppe, Clara Jule Marie; Holtz, Lena-Maria; Trimborn, Scarlett; Rost, Björn (2015): Ocean acidification decreases the light-use efficiency in an Antarctic diatom under dynamic but not constant light. New Phytologist, 207(1), 159-171 ...