Summary of Shannon diversity analysis of all DGGE results from all sample years and nucleic acid types.

1Although date was a significant factor in the ANOVA, means comparison tests did not indicate any significant differences among dates.
P-values are only shown for terms with P<0.05. Means followed by the same letter for a given factor are not significantly different (P<0.05; Tukey’s HSD test where there are more than two treatment levels).