Table 2 Tukey's multiple comparison post hoc tests for δ13C values in four invertebrate trophic groups collected above and below waterfall barriers to salmon migration on the Clatse and Neekas Rivers, British Columbia. N/A indicates post hoc tests not possible due to low sample sizes.
| Â | Â | Clatse River | |||
|---|---|---|---|---|---|
| Â | Â | Below falls | Above falls | ||
Trophic grouping (1) | Trophic grouping (J) | Mean Difference (I-J) | Significance | Mean Difference (I-J) | Significance |
Predators | Root Feeders | 0.77 | 0.555 | 1.17 | 0.004 |
Predators | Omnivores | 1.27 | 0.036 | 2.14 | <0.001 |
Omnivores | Root Feeders | -0.49 | 0.847 | -0.92 | 0.058 |
| Â | Â | Neekas River | |||
| Â | Â | Below falls | Above falls | ||
Trophic grouping (1) | Trophic grouping (J) | Mean Difference (I-J) | Significance | Mean Difference (I-J) | Significance |
Predators | Root Feeders | 1.80 | 0.033 | 0.90 | N/A |
Predators | Omnivores | 2.02 | <0.001 | 2.46 | <0.001 |
Omnivores | Root Feeders | -0.22 | 0.984 | -2.08 | N/A |