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Table 2

Two-way Generalized Linear Models (Gamma distribution, log link function) to test the effect of sampling date and habitat type on the density of amphipods.

Species/group Effect df χ2 P
(a) Pontogammarus robustoides Sampling date (D) 3 327.2 <0.001*
Habitat type (H) 4 67.9 <0.001*
D × H 12 929.8 <0.001*
(b) Dikerogammarus villosus Sampling date (D) 3 13.8 0.003*
Habitat type (H) 4 894.4 <0.001*
D × H 12 37.9 <0.001*
(c) Dikerogammarus juveniles Sampling date (D) 3 4.5 0.215
Habitat type (H) 4 178.3 0.001*
D × H 12 17.9 0.119
(d) Echinogammarus ischnus Sampling date (D) 3 79.5 <0.001*
Habitat type (H) 4 948.3 <0.001*
D × H 12 317.8 <0.001*

*Asterisks indicate statistically significant effects.

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