ORCID Profile
0000-0002-1070-2968
Current Organisation
Université de Montréal
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Publisher: Informa UK Limited
Date: 1995
Publisher: Elsevier BV
Date: 1995
DOI: 10.1016/0269-7491(94)P4167-M
Abstract: To assess the potential of the epiphyton community for monitoring spatial and temporal variations in the environmental quality of freshwater ecosystems, this paper describes the response of epiphytons to ecological and toxicological factors in Lake Saint-François, a fluvial lake of the St. Lawrence River (Québec). First, community descriptions and biotic indices based on size structure and on taxonomic composition were compared to test if size could usefully describe epiphyton response to environmental factors. Secondly, the relative contribution of ecological and toxicological variables in explaining the variation observed in epiphyton was quantified. A size-based approach classified the sites similarly to taxonomic analysis, but a larger portion of variance in size could be explained indicating a stronger relationship with environmental factors. Among both taxonomy and size-based biotic indices, the slope of the normalized size spectra performed best in terms of total explained variance. There were strong interactions between toxicological and ecological variables. These interactions should be considered in the planning and interpretation of biomonitoring studies. In such surveys, s les should be collected at sites with similar ecological characteristics: for ex le, the same macrophyte type and sediment texture. Interpretation of the data should consider the possible covariance of toxicological and ecological variables.
Publisher: Wiley
Date: 17-01-2003
Publisher: Oxford University Press (OUP)
Date: 07-08-2007
Publisher: Oxford University Press (OUP)
Date: 10-2002
Publisher: Canadian Science Publishing
Date: 10-2006
DOI: 10.1139/F06-117
Abstract: Changes in phytoplankton and zooplankton communities were studied in 16 lake-years during a large-scale experimental before–after study as part of the Terrestrial Riparian Organisms Lakes and Streams (TROLS) project. After forest harvesting, phytoplankton biomass and especially cyanobacterial biomass increased in some of the experimental lakes, up to an order of magnitude. Although the response of phytoplankton was not directly related to the intensity of forest harvesting, this large-scale experiment provided a unique opportunity for studying the effects of an increasing gradient in cyanobacterial biomass on zooplankton communities. Cladoceran size structure and biomass were negatively correlated with cyanobacterial biomass, suggesting that large cladocerans and especially daphnids were inhibited by the increase in cyanobacterial biomass. The increase in cyanobacterial biomass seems to have caused a significant reduction in the size structure of zooplankton communities. As no correlation was found between cladocerans and cyanotoxins, our results point more towards feeding inhibition by filamentous and colonial cyanobacteria as a possible cause for the decline in the size structure and biomass of zooplankton communities. These results suggest that the increase in cyanobacterial biomass is likely to cause a shift in the size of zooplankton communities, which will lead to a profound change in functioning of lake systems.
Publisher: Wiley
Date: 06-1998
Publisher: Wiley
Date: 24-08-2001
Publisher: Informa UK Limited
Date: 2008
Publisher: Wiley
Date: 05-2004
Publisher: Springer Netherlands
Date: 2007
No related grants have been discovered for Bernadette Pinel-Alloul.