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Applied Multivariate Analysis in SAR and Environmental by Brigitte Escofier, Jérôme Pagès (auth.), J. Devillers, W.

By Brigitte Escofier, Jérôme Pagès (auth.), J. Devillers, W. Karcher (eds.)

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Example text

Two main hypotheses can explain this difference in the structure of the two groups: 1) botanical variability is due not only to edaphic variability but also from other ecological factors like human influence. 2) botanical parameters can be considered as exhaustive because all the plants were recorded. 3. The MFA weighting - Despite its smaller number of variables, the edaphic group has a higher first eigenvalue than the botanical group. This is due to the strongly unidimensional structure of edaphic parameters.

This factor can be considered as genernl, that is concerning many stations. The factors of rank 2,3,4 have nearly identical inertias. They are due almost exclusively to the botanical group. This is not really surprising since only this group has a multidimensional structure. The study of these factors in the framework ofMFA (which is constructed in order to study several groups of variables simultaneously) is not of principal importance. Thus we restrict our comments to the two first factors. 2 % (B9).

2. RESULTS (SEE PRINTOUT APPENDIX 5 AND FIGURE 16) The first factor accounts for 63% of the total inertia, and the second one for 17%. The first factor is preponderant and the first plane fits the data well. The first factor opposes elephants to birds. Among the 7 frugivores, these two have the most different diets. The quality of representation of these two points is large : the difference of their diets is well shown by this factor. What are the characters which oppose the diet of elephants to the diet of birds?

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