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Estimated biomass for floating and benthic biofilms harvested from periphytometers after 7-day incubation periods. (a) Representation of the seasonal trend in average pixel density. (b) Correlation of pixel density estimates and estimated AFDW of benthic samples. (c) Correlation analyses of biomass versus light: optical density of biofilms (squares, benthic; circles, floating) and ambient PAR. (d) Optical density estimates and average ambient water temperatures.
