Combined effects of increased UV-B and temperature on the pigment-determined marine phytoplankton community of the St. Lawrence Estuary

The combined effects of increased UV-B and temperature on natural marine phytoplankton from the St. Lawrence Estuary (Canada) were examined in an 8 d mesocosm experiment carried out in Rimouski (Québec, Canada) in August 2008. We tested the hypothesis that increased temperature (+3°C) will offset al...

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Bibliographic Details
Published in:Marine ecology. Progress series (Halstenbek) 2012-01, Vol.445, p.219-234
Main Authors: Lionard, M., Roy, S., Tremblay-Létourneau, M., Ferreyra, G. A.
Format: Article
Language:English
Subjects:
Algal blooms
Bacillariophyceae
Biomass
Brackish
Diatoms
Global warming
High temperature
Lamps
Marine
Phytoplankton
Pigments
Temperature effects
Violas
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Summary:The combined effects of increased UV-B and temperature on natural marine phytoplankton from the St. Lawrence Estuary (Canada) were examined in an 8 d mesocosm experiment carried out in Rimouski (Québec, Canada) in August 2008. We tested the hypothesis that increased temperature (+3°C) will offset algal growth suppression by UV-B (78% UV-B increase) using duplicate mesocosm experiments containing natural phytoplankton assemblages. The response of the entire phytoplankton community, in terms of HPLC pigment-based phytoplankton bio mass, community composition (CHEMTAX), xanthophyll cycles photoprotection and quantum yield of photosystem II (the ratio of variable to maximum fluorescence:F v/F m), showed a significant influence of temperature (negative on small phytoplanktonic cells,
ISSN:0171-8630
1616-1599
DOI:10.3354/meps09484