Open Access

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).

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.