Table 3
Generalized Linear Models (Gamma distribution, log link function) to test the relationships among particular amphipod groups and other macroinvertebrate taxa.
| Amphipod | Habitat | Covariate | χ2 | P | B |
|---|---|---|---|---|---|
| (a) Pontogammarus robustoides | Sand 0.2 m | Chir | 3.1 | 0.079 | |
| Oli | 0.4 | 0.534 | |||
| Sand 0.5 m | Gastr | 1.4 | 0.229 | ||
| Dp | 0.5 | 0.479 | |||
| Sph | 0.0 | 0.877 | |||
| Chir | 0.6 | 0.422 | |||
| Oli | 0.0 | 0.878 | |||
| Plants | Dv | 2.0 | 0.156 | ||
| Gastr | 0.1 | 0.714 | |||
| Dp | 5.9 | 0.015 | −0.001 | ||
| Sph | 62.2 | <0.001 | 0.003 | ||
| Chir | 40.4 | <0.001 | 0.0001 | ||
| Oli | 9.7 | 0.002 | 0.0001 | ||
| Stones | Dv | 4.2 | 0.040 | 0.001 | |
| Ei | 9.6 | 0.002 | 0.005 | ||
| Gastr | 6.3 | 0.012 | 0.00002 | ||
| Dp | 2.9 | 0.089 | |||
| Chir | 57.2 | <0.001 | 0.002 | ||
| Oli | 0.1 | 0.796 | |||
| (b) Dikerogammarus villosus | Plants | Pr | 0.7 | 0.401 | |
| Gastr | 2.3 | 0.134 | |||
| Dp | 0.7 | 0.392 | |||
| Sph | 1.0 | 0.327 | |||
| Chir | 1.0 | 0.311 | |||
| Oli | 0.6 | 0.425 | |||
| Stones | Pr | 16.0 | <0.001 | 0.002 | |
| Ei | 3.7 | 0.043 | 0.002 | ||
| Gastr | 0.2 | 0.686 | |||
| Dp | 93.6 | <0.001 | 0.0003 | ||
| Chir | 20.0 | <0.001 | 0.001 | ||
| Oli | 15.8 | <0.001 | −0.004 | ||
| (c) Dikerogammarus juveniles | Stones | Pr | 0.6 | 0.427 | |
| Dv | 11.1 | 0.001 | −1.95 | ||
| Ei | 9.0 | 0.003 | 3.23 | ||
| Gastr | 2.7 | 0.099 | |||
| Dp | 7.1 | 0.008 | 0.6 | ||
| Chir | 2.2 | 0.143 | |||
| Oli | 1.6 | 0.203 | |||
| (d) Echinogammarus ischnus | Stones | Pr | 6.6 | 0.010 | 0.003 |
| Dv | 7.9 | 0.005 | 0.003 | ||
| Gastr | 5.7 | 0.017 | −0.0005 | ||
| Dp | 6.4 | 0.012 | 0.001 | ||
| Chir | 1.9 | 0.165 | |||
| Oli | 7.1 | 0.008 | 0.031 |
Competitors/predators: Pr, Pontogammarus robustoides; Dv, Dikerogammarus villosus; Djuv, Dikerogammarus juveniles; Ei, Echinogammarus ischnus. Shelter providers: Gastr, Gastropoda; Dp, Dreissena polymorpha; Sph, Sphaeriidae; Chir, Chironomidae; Oli, Oligochaeta.
The models were conducted separately for each habitat type and included one of the amphipod groups as a response variable, sampling date (not shown) as a categorical factor and all other taxa present in a given habitat as covariates. Positive and negative values of regression parameters (B) shown for significant effects indicate positive and negative relationships (respectively).
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