Photochemical activity of PSII of tropical phytoplankton communities of Southern Brazil exposed to solar radiation and nutrient addition

Differential Responses of Two Phytoplankton Communities from the Chubut River Estuary (Patagonia, Argentina) to the Combination of UVR and Elevated Temperature

“…In this regard, NPQ was higher, for both phytoplankton communities, on day 1 than day 5 (data not shown), reflecting higher dissipation of excess energy on day 1. Similarly, in studies carried out in a tropical estuary of southern Brazil (Babitonga Bay), higher NPQ values were found at the beginning of the experiment (i.e., nonacclimated cells) or under less favorable conditions (i.e., ambient concentration of nutrients vs. addition of nutrients) after a few days of acclimation (Villafañe et al 2013b).…”

Interactive Effect of UVR and Phosphorus on the Coastal Phytoplankton Community of the Western Mediterranean Sea: Unravelling Eco-Physiological Mechanisms

“…However, previous studies also have evidenced a null [ 20 ] or positive [ 21 ] effect of UVR on phytoplankton. Different protective strategies such as improved efficiency of repair processes at the sub-cellular level of algae exposed to high UVR [ 22 ], synthesis of photoprotective compounds [ 23 , 24 ] or changes in taxonomic composition towards communities better adapted to the new conditions [ 25 ] are among the mechanisms evolved to allow the acclimation of algae to UVR in marine waters.…”

“…Secondly, the nutrient status of phytoplankton may determine the susceptibility of these organisms to UVR [ 32 ]. Despite that nutrient-deficient phytoplankton, especially those limited by N [ 6 , 25 , 33 ], are generally considered to be more sensitive to UVR than are nutrient-replete phytoplankton, some authors have reported a higher sensitivity of phytoplankton to UVR under nutrient-replete conditions [ 34 ]. Variations in the type of nutrient that limits phytoplanktonic growth or the severity of this limitation, as well as differential tolerance/response to UVR by the phytoplanktonic community [ 26 ], are some of the potential interpretations proposed to explain the wide variability of algal responses to UVR and nutrients.…”