Figure 6. Stable isotope results for potential source materials of sedimentary organic matter with shading showing observed ranges for each type of material in the Tualatin River basin, Oregon. Groups with statistically significant differences (α=0.05) are denoted with different letters (Tukey Grouping). No significant differences were found among the groups for δ¹³C. [Abbreviations: WR=Western Red, TR=Tualatin River, number following TR=river mile location, JB=Jackson Bottom, DW=duckweed, OGI=Oregon Graduate Institute, RC=Rock Creek, Dur=Durham, WWTF=Wastewater Treatment Facility].

First posted August 17, 2010