[R-sig-eco] Mantel() with strata

Hi all I’m computing mantel test between species dissimilarity and geographic distance between all pairwise island comparisons in three archipelagos (each with 9, 7 and 3 islands) within the same biogeographical region. I’m using mantel() of vegan package, and I was wondering if I should use the

[R-sig-eco] FW: betadisper

Dear all I'm using betadisper () to evaluate if geographical and historical heterogeneity differ statistically between two archipelagos. I have not problems in obtaining the results for the geographical hypothesis (computing the Euclidean distance between UTM centroids of each island), but for