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Summary of the Canonical Correspondence Analyses performed on 
the 4 taxa examined. Significant factors were selected by a stepwise procedure 
analogous to backward elimination in multiple regression analysis. 

CORALS Axis 1 Axis 2 Axis 3
Correlations of environmental variables with ordination axes
(1) Passes  0.799 0.337 0
(2) Degree of aperture 0.779 -0.379 0
Summary statistics for ordination axes 
Eigenvalues 0.298 0.108 0.169
Cumulative % of variance (species data) 34.8 47.4 67.2
Species-environment correlations 0.870 0.857 0
 
Sum of all unconstrained eigenvalues 0.856
Sum of all canonical eigenvalues 0.406
Monte Carlo probability for significance of the sum of all eigenvalue 0.04


MOLLUSCS Axis 1 Axis 2 Axis 3 
Correlations of environmental variables with ordination axes 
(1) Degree of aperture  0.930 0 0
Summary statistics for ordination axes
Eigenvalues 0.400 0.296 0.166
Cumulative % of variance (species data) 34.0 59.2 73.3
Species-environment correlations 0.930 0 0
 
Sum of all unconstrained eigenvalues 1.175
Sum of all canonical eigenvalues 0.400
Monte Carlo probability for significance of the sum of all eigenvalues 0.01


ECHINODERMS Axis 1 Axis 2 Axis 3
Correlations of environmental variables with ordination axes 
(1) Passes 0.492 0.158  0.419
(2) Surface area -0.036 -0.180 0.485
(3) Pinnacles 0.092 -0.488 0.415
Summary statistics for ordination axes
Eigenvalues 0.654 0.102 0.108
Cumulative % of variance (species data) 71.7 82.9 83.0
Species-environment correlations 0.980 0.910 0.496
 
Sum of all unconstrained eigenvalues 0.912
Sum of all canonical eigenvalues 0.757
Monte Carlo probability for significance of the sum of all eigenvalues 0.04


MACROALGAE Axis 1 Axis 2 Axis 3
Correlations of environmental variables with ordination axes 
(1) Passes 0.722 0 0
Summary statistics for ordination axes
Eigenvalues 0.161 0.305 0.110
Cumulative % of variance (species data) 24.0 69.4 85.9
Species-environment correlations  0.722 0 0
 
Sum of all unconstrained eigenvalues 0.670
Sum of all canonical eigenvalues 0.161
Monte Carlo probability for significance of the sum of all eigenvalues 0.01

 

* Selected factors are significant at p<0.1 

mise à jour : 10/07/2008

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