Isabelle Laurion
Université du Québec à Rimouski
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Isabelle Laurion.
Journal of Phycology | 2009
Isabelle Laurion; Suzanne Roy
Long‐term growth response to natural solar radiation with enhanced ultraviolet‐B (UVB) exposure was examined in two species of dinoflagellates [Alexandrium tamarense (M. Lebour) Balech, At, and Heterocapsa triquetra (Ehrenb.) F. Stein, Ht], including two strains of A. tamarense, one from Spain and another from UK, and one diatom species (Thalassiosira pseudonana Hasle et Heimdal). We examined whether variable photoprotection (mycosporine‐like amino acids [MAAs] and xanthophyll‐cycle pigments) affected photosynthetic performance, phytoplankton light absorption, and growth. Growth rate was significantly reduced under enhanced UVB for the UK strain of At and for Ht (both grew very little) as well as for the diatom (that maintained high growth rates), but there was no effect for the Spanish strain of At. MAA concentration was high in the dinoflagellates, but undetectable in the diatom, which instead used the xanthophyll cycle for photoprotection. The highest cell concentrations of MAAs and photoprotective pigments were observed in the UK strain of At, along with lowest growth rates and Fv/Fm, indicating high stress levels. In contrast, the Spanish strain showed progressive acclimation to the experimental conditions, with no significant difference in growth between treatments. Increase in total MAAs followed linearly the cumulative UVB of the preceding day, and both total and primary MAAs were maintained at higher constitutive levels in this strain. Acclimation to enhanced UVB in the diatom resulted in an increase in PSII activity and reduction in nonphotochemical quenching, indicating an increased resistance to photoinhibition after a few weeks. All four species showed increased phytoplankton light absorption under enhanced UVB. Large intrastrain differences suggest a need to consider more closely intraspecific variability in UV studies.
Limnology and Oceanography | 2000
Isabelle Laurion; Marc Ventura; Jordi Catalan; Roland Psenner; Ruben Sommaruga
Aquatic Microbial Ecology | 2002
Isabelle Laurion; Andrea Lami; Ruben Sommaruga
Limnology and Oceanography | 2001
Barbara Tartarotti; Isabelle Laurion; Ruben Sommaruga
Limnology and Oceanography-methods | 2003
Isabelle Laurion; Frédérick Blouin; Suzanne Roy
Aquatic Microbial Ecology | 1998
Isabelle Laurion; David R. S. Lean; Warwick F. Vincent
Archive | 2007
Isabelle Lavoie; Isabelle Laurion; Annabelle Warren; Warwick F. Vincent
Archive | 2007
Isabelle Lavoie; Isabelle Laurion; Warwick F. Vincent
Archive | 2009
Isabelle Laurion; Alain N. Rousseau; Karem Chokmani; Patrick Drogui; Sébastien Bourget; Annabelle Warren; Paul E. Drevnick
Archive | 2007
Isabelle Lavoie; Isabelle Laurion; Warwick F. Vincent