Effects of solar ultraviolet radiation on biomass production and pigment contents of Spirulina platensis in commercial operations under sunny and cloudy weather conditions

CO<sub>2</sub>-induced seawater acidification affects physiological performance of the marine diatom <i>Phaeodactylum tricornutum</i>

“…Since phytoplankton cells are also susceptible to solar UV radiation in their natural environment (Gao et al, 2007), their physiology may be synergistically affected by UV and ocean acidification (Sobrino et al, 2008). While UV-A was also found to enhance photosynthetic carbon fixation (Gao et al, 2007) of phytoplankton assemblages and growth of a cyanobacterium (Wu et al, 2005), the change of water column primary productivity is uncertain due to the scarce knowledge on the combined effects of acidification and solar radiation in the euphotic zone. Based on the results from the present study, the ongoing ocean acidification may cause diatoms to increase growth, down-regulate their CCM, and experience enhanced photoinhibition and dark respiration.…”

Solar UV Radiation Drives CO2 Fixation in Marine Phytoplankton: A Double-Edged Sword

“…UV-A enhances carbon fixation of phytoplankton under reduced (Nilawati et al, 1997;Barbieri et al, 2002) or fast-fluctuating solar irradiance and allows photorepair of UV-B-induced DNA damage (Buma et al, 2003). Furthermore, the presence of UV-A resulted in higher biomass production of A. platensis as compared to that under PAR alone (Wu et al, 2005a). Energy of UVR absorbed by the diatom Pseudo-nitzschia multiseries was found to cause fluorescence (Orellana et al, 2004).…”

Synergistic effect of UV radiation and nutrient limitation on Chlorella fusca (Chlorophyta) cultures grown in outdoor cylindrical photobioreactors

“…UVA has been reported to have both negative and positive effects in phytoplankton. A decrease in primary production (measured as C incorporation) is among the negative effects , while among the positive effects, UVA can act to enhance C fixation , allow photorepair (Buma et al 2003), increase biomass (Wu et al 2005) and favour primary productivity by means of utilization of UVA as an energy supply for CO 2 fixation (Gao et al 2007). The impact of UVR on the cells depends on the bio-optical characteristics related to cell size and pigment composition .…”