Fig. 2.

Box-whisker plots of the fraction of zooplankton biomass from terrestrial organic matter estimated from IsoSource models by using only one stable isotope ratio (δ²H) in Paul and Crampton lakes. The box boundaries represent the 25th and 75th percentile, the horizontal line is the median, and the whiskers mark the 10th and 90th percentiles. The dots denote the 5 and 95% values of the distribution. The models include combinations of possible sources: T, terrestrial; P, phytoplankton in the upper mixed layer; D, phytoplankton at the chlorophyll max in oxic water; L, benthic algae.