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Dive into the research topics where Isabelle Laurion is active.

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Featured researches published by Isabelle Laurion.


Journal of Phycology | 2009

GROWTH AND PHOTOPROTECTION IN THREE DINOFLAGELLATES (INCLUDING TWO STRAINS OF ALEXANDRIUM TAMARENSE) AND ONE DIATOM EXPOSED TO FOUR WEEKS OF NATURAL AND ENHANCED ULTRAVIOLET‐B RADIATION1

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

Attenuation of ultraviolet radiation in mountain lakes : factors controlling the among- and within-lake variability

Isabelle Laurion; Marc Ventura; Jordi Catalan; Roland Psenner; Ruben Sommaruga


Aquatic Microbial Ecology | 2002

Distribution of mycosporine-like amino acids and photoprotective carotenoids among freshwater phytoplankton assemblages

Isabelle Laurion; Andrea Lami; Ruben Sommaruga


Limnology and Oceanography | 2001

Large variability in the concentration of mycosporine‐like amino acids among zooplankton from lakes located across an altitude gradient

Barbara Tartarotti; Isabelle Laurion; Ruben Sommaruga


Limnology and Oceanography-methods | 2003

The quantitative filter technique for measuring phytoplankton absorption: Interference by MAAs in the UV waveband

Isabelle Laurion; Frédérick Blouin; Suzanne Roy


Aquatic Microbial Ecology | 1998

UVB effects on a plankton community: results from a large-scale enclosure assay

Isabelle Laurion; David R. S. Lean; Warwick F. Vincent


Archive | 2007

Les fleurs d'eau de cyanobactéries : Revue de littérature.

Isabelle Lavoie; Isabelle Laurion; Annabelle Warren; Warwick F. Vincent


Archive | 2007

Les fleurs d’eau de cyanobactéries, document d’information vulgarisée.

Isabelle Lavoie; Isabelle Laurion; Warwick F. Vincent


Archive | 2009

Mémoire sur la situation des lacs au Québec en regard des cyanobactéries.

Isabelle Laurion; Alain N. Rousseau; Karem Chokmani; Patrick Drogui; Sébastien Bourget; Annabelle Warren; Paul E. Drevnick


Archive | 2007

Les fleurs d’eau de cyanobactéries, vulnérabilité des prises d’eau.

Isabelle Lavoie; Isabelle Laurion; Warwick F. Vincent

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Suzanne Roy

Université du Québec à Rimouski

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Annabelle Warren

Institut national de la recherche scientifique

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Karem Chokmani

Institut national de la recherche scientifique

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Frédérick Blouin

Université du Québec à Rimouski

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