Figure 2

Spatio-temporal variation in the proportions of the main photosynthetic taxonomic groups in the Loue River biofilms estimated by microscopic cell counting (stacked histogram) and in chlorophyll-a concentrations (black circles). Values and error bars represent the means of the three replicates and the standard deviations, respectively, except for Chamblay in July, where only one sample was collected due to poor weather conditions. Abbreviations: Aug, August; Sept, September.