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.

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

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

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

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


Hocking and Reimchen BMC Ecology 2002 2:4   doi:10.1186/1472-6785-2-4

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