Open Access
Table 1
Results of the GLM for the effects of crayfish status and time on macroinvertebrate densities and species richness.
| Response | Factors | d.f. | F | P |
|---|---|---|---|---|
| Overall density | Crayfish status | 2 | 17.09 | <0.001 |
| Year | 4 | 5.10 | 0.003 | |
| Crayfish status * Year-interaction | 8 | 3.61 | 0.005 | |
| Gastropoda density | Crayfish status | 2 | 161.00 | <0.001 |
| Year | 4 | 8.95 | <0.001 | |
| Crayfish status * Year-interaction | 8 | 11.85 | <0.001 | |
| Bivalvia density | Crayfish status | 2 | 4.42 | 0.021 |
| Year | 4 | 2.32 | 0.081 | |
| Crayfish status * Year-interaction | 8 | 2.28 | 0.050 | |
| Coleoptera density | Crayfish status | 2 | 30.74 | <0.001 |
| Year | 4 | 2.05 | 0.114 | |
| Crayfish status * Year-interaction | 8 | 1.54 | 0.188 | |
| Crustacea density | Crayfish status | 2 | 13.88 | <0.001 |
| Year | 4 | 10.53 | <0.001 | |
| Crayfish status * Year-interaction | 8 | 10.53 | <0.001 | |
| Diptera density | Crayfish status | 2 | 2.97 | 0.067 |
| Year | 4 | 2.39 | 0.074 | |
| Crayfish status * Year-interaction | 8 | 3.50 | 0.006 | |
| Ephemeroptera density | Crayfish status | 2 | 31.08 | <0.001 |
| Year | 4 | 13.95 | <0.001 | |
| Crayfish status * Year-interaction | 8 | 10.67 | <0.001 | |
| Hirunidea density | Crayfish status | 2 | 16.17 | <0.001 |
| Year | 4 | 18.61 | <0.001 | |
| Crayfish status * Year-interaction | 8 | 10.88 | <0.001 | |
| Oligochaeta density | Crayfish status | 2 | 7.012 | 0.003 |
| Year | 4 | 3.111 | 0.030 | |
| Crayfish status * Year-interaction | 8 | 3.347 | 0.007 | |
| Trichoptera density | Crayfish status | 2 | 28.76 | <0.001 |
| Year | 4 | 16.38 | <0.001 | |
| Crayfish status * Year-interaction | 8 | 14.36 | <0.001 | |
| Overall species richness | Crayfish status | 2 | 17.092 | <0.001 |
| Year | 4 | 4.302 | <0.001 | |
| Crayfish status * Year-interaction | 8 | 1.708 | 0.130 | |
| Gastropoda species richness | Crayfish status | 2 | 153.02 | <0.001 |
| Year | 4 | 5.29 | <0.001 | |
| Crayfish status * Year-interaction | 8 | 6.22 | <0.001 |
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