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Table 1 Tukey's multiple comparison post hoc tests for δ15N values in four invertebrate trophic groups collected above and below waterfalls on the Clatse and Neekas Rivers, British Columbia. N/A indicates post hoc tests not possible due to low sample sizes.

From: Salmon-derived nitrogen in terrestrial invertebrates from coniferous forests of the Pacific Northwest

   Clatse River
   Below falls Above falls
Trophic grouping (1) Trophic grouping (J) Mean Difference (I-J) Significance Mean Difference (I-J) Significance
Predators Root Feeders 5.93 <0.001 8.31 <0.001
Predators Detritivores 5.81 <0.001 4.39 <0.001
Predators Omnivores 1.28 0.615 1.30 0.123
Omnivores Root Feeders 4.65 0.002 7.01 <0.001
Omnivores Detritivores 4.52 0.005 3.09 <0.001
Detritivores Root Feeders 0.13 1.000 3.92 <0.001
   Neekas River
   Below falls Above falls
Trophic grouping (1) Trophic grouping (J) Mean Difference (I-J) Significance Mean Difference (I-J) Significance
Predators Root Feeders 8.55 <0.001 5.33 N/A
Predators Detritivores 6.14 <0.001 5.32 <0.001
Predators Omnivores 5.84 <0.001 3.34 <0.001
Omnivores Root Feeders 2.7 0.548 1.99 N/A
Omnivores Detritivores 0.3 0.999 1.98 0.006
Detritivores Root Feeders 2.4 0.693 0.01 N/A