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JPR Advance Access published online on July 26, 2005
Journal of Plankton Research, doi:10.1093/plankt/fbi042
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org
Received January 27, 2005
Accepted June 23, 2005

Article

Seasonal changes in composition of the cyanobacterial community and the occurrence of hepatotoxic blooms in the Eastern Townships, Quebec, Canada

Anne Rolland 1, David F. Bird 1*, and Alessandra Giani 2

1 Département des Sciences Biologiques, Université du Québec à Montréal Case postale 8888, succ. Centre-ville, Montréal Canada H3C 3P8
2 Universidade Federal de Minas Gerais, Dept. Botanica - ICB. C.P. 486, 31270-010. Belo Horizonte, MG, Brasil

* To whom correspondence should be addressed.
David F. Bird, E-mail: bird.david{at}uqam.ca


  Abstract

Four eutrophic lakes in the Eastern Townships (Quebec, Canada) were sampled on a biweekly basis between May and October 2001 to examine seasonal changes, and to study the role of taxonomic and environmental factors in cyanobacterial toxin production. Microcystin-LR (MC-LR) equivalent content was determined using a protein phosphatase inhibition assay on extracts of lyophilized plankton. Three of the lakes showed a similar pattern of maximum water column toxicity in late summer, while in the fourth toxicity was highest in spring and then declined over the year. Variations in water toxicity level could be attributed to the abundance of two potentially toxigenic genera, Microcystis and Anabaena. A multiple regression model explained 75% of the variation in microcystin concentration, based on water column total nitrogen concentration (TN) and the biomass of these two genera. Microcystis and Anabaena genera appeared to be similarly toxic in all lakes. Increased water column stability, higher light extinction coefficient and a lack of dissolved nutrients were all associated with increased total biomass of toxigenic cyanobacterial genera.

Keywords: cyanobacteria, hepatotoxins, microcystin, seasonal changes.
Communicating Editor: KJ Flynn
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