Ocean acidification decreases the light-use efficiency in an Antarctic diatom under dynamic but not constant light.

ABSTRACT: 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 μatm) 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

SUBMITTER: Hoppe CJM 

PROVIDER: S-EPMC4950296 | biostudies-literature | 2015 Jul

REPOSITORIES: biostudies-literature