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By measuring Chl a, zooplankton biomass, nutrient concentrations, and water residence time in 31 rivers in eastern Canada, we tested the following hypotheses: Chl a is positively related to nutrient concentrations and water residence time, and zooplankton biomass is positively related to Chl a and water residence time. Chl a ranged from 1.8 to 27.6 µ g liter −1 , total phosphorus (TP) from 7.3 to 212.3 µ g liter −1 , and water residence time from 3.3 to 19.4 d. There was a positive relationship between Chl a and TP ( R 2 = 0.76) and no relationship between Chl a and residence time. In contrast, zooplankton biomass was positively related to water residence time ( R 2 = 0.33). There was only a weak positive relationship between Chl a and zooplankton biomass. Mean river zooplankton biomass was low (11.3 µ g liter −1 dry mass) compared to lakes of similar Chl a concentration.
Bum et al. (Fri,) studied this question.