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Bocconea 16(1)- 2003 99
Multi-Response Permutation Procedures (MRPP)
Main matrix Second matrix J
44 islands ] 44 islands
[ 340 s;ecies
[ 1 substr~te group
variable
Dissimilarity measure: Sorensen
GROUP 1: Silicatic
Size: 19
Within-group average distance = 0.868625
GROUP 2: Carbonatic
Size: 25
Within-group average distance = 0.727454
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Test statistic: T = -6.006215
Observed delta= 0.788414
Expected delta= 0.806349
Chance-corrected within-group agreement: R = 0.022242
Probability (<obs. delta): p= 0.000084
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Fig. 5. Ressemblance flonstique à l'intérieur des deux groupes d'iles (calcaires et siliceuses) avec
l'analyse MRPP.
... 4 ANOVA test
F=0,548
iii p=0,4631
c
.1:
-.~.
QJ
..u
aQJ.
QJ
>.
.1:
Q.
e~
o
Carbonatic Silicatic
Fig. 6. Richesse muscinale moyenne des deux groupes de iles (calcaires et siliceuses).
