TABLE 2.

Statistical analyses reveal that isolation frequency and diversity of endophytes from aquatic macrophytes did not differ significantly as a function of sampling period, reservoir (Lower Lake Mary, Watson Lake, Willow Creek Reservoir), host species (Persicaria amphibia, Stuckenia pectinata), tissue type (roots vs. submerged photosynthetic tissues), or water depth at the sampling site. Only reservoirs and hosts sampled in both years were considered. Because no interannual differences in isolation frequency or diversity were observed, data were combined for both years prior to analysis by reservoir. Thereafter, data were iteratively combined in the order shown below for each subsequent analysis. No interaction terms were significant. Asterisks indicate moderately supported but nonsignificant trends suggesting (a) higher isolation frequency in shallower water, and (b) higher diversity in roots vs. submerged photosynthetic tissues. Survey data and means and standard deviations following appropriate transformations for each analysis are shown in Table S1 and Table S2, respectively.

Explanatory variable	Isolation frequency	Diversity
Sampling period	t = −0.39, p = 0.0755	t = −0.49, p = 0.6435
Reservoir	F = 0.29, p = 0.7477	F = 0.43, p = 0.6654
Host species	t = −0.08, p = 0.9399	t = −1.62, p = 0.1441
Tissue	t = −0.47, p = 0.6386	t = −2.46, p = 0.0577*
Water depth	R2 = 0.08, p = 0.0609*	R2 = 0.01, p = 0.7321