The entropy effective number of species of a community, is defined as where is the entropy of the community [18] . Sample entropies were computed according to the method descried by Chao and Shen [25] , as implemented in the R ‘entropy’ package [26] . For each body-site, the effective number of species reported in the main text is the average of the effective number of species of all samples corresponding to that body-site.
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