Caption [Edited]

Figure x: concentration of lead (Pb), zinc (Zn), copper (Cu), manganese (Mn) and chromium (Cr) analyzed in sediment from the Paramecium Pond system. Data from the Pond Edge and Pond Center are average values from several sample locations, while the stream values are single data points. Note that in general, Mn concentration decreases through the system; Zn decreases through the stream, but is more present in the pond; and Pb has a higher concentration in the pond than in the stream. Also note that Cu and Cr are not present in the stream at detectable levels.

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