at the edge of significancep = 0.058
However, Simpson diversity revealed non-significant differences when comparing all groups (H = 7.824, p = 0.099), but significant differences between Madeira-mainland Portugal (H = 5.143, p = 0.023) and differences at the edge of significance between Madeira and Selvagens (H = 3.57, p = 0.058) (Fig. 3 b).