Results/Conclusions The least abundant and frequent AM fungi species were Glomus sp1, Scutellospora heterogama, Acaulospora laevis, Glomus sp2, and Glomus sp4; whereas, the most abundant and registered in all fragments were Acaulospora spinosa, Glomus claroideum, Glomus sinuosum, Acaulospora scrobiculata, Glomus tenebrosum, and Glomus verruculosum. Estimated species richness, Simpson diversity index and Bray-Curtis similarity index were calculated. The smallest fragment presented the AM fungi highest estimated richness (91 species) while the largest fragments presented the lowest (29). However, there was a positive relationship between diversity and fragment size; the highest diversity value corresponded to the largest fragment. The smallest fragment shared more than 50% of species with the other fragments. Distance seems to be an important factor to explain these results, not size. But also it is clear that AM fungi community presents a great resistance to fragmentation effects, and may be these are more related to the interaction performance.