Masting effect on alpha and beta avian diversity in fragmented forests of relict-endangered Mexican Beech (Fagus grandifolia subsp. mexicana)

Abstract Background Tropical montane cloud forests are one of the most important hotspots on Earth and show presence relict-endemic endangered species, representing about 14% total tropical forest worldwide. Synchronous seed production or masting in tree species is a widespread reproductive strategy deciduous evergreen broad-leaved associations to decrease costs reproduction ensure offspring. Masting event maintains high avian diversity, which can be modified by phenological process (seed non-seed production). Methods The main aim this study was assess alpha beta diversity whether composition trophic guild modifies among processes between two fragmented relict-endangered Mexican Beech ( Fagus grandifolia subsp. mexicana ) (Medio Monte El Gosco) state Hidalgo. In addition, we evaluated beechnut production. Results We recorded 36 bird 11 them included some conservation risk status, 5 endemic species. Alpha values were dissimilar richness q = 0) beech forests. Avian communities three structurally similar, dominated during immature seeds Brown-backed Solitaire (granivores–insectivores–frugivores); mature White-crowned Parrot Pionus senilis , granivores–frugivores); Dwarf Jay Cyanolyca nana insectivores) abundant low quality. complementarity index found turnover value seeds—mature seeds—low Furthermore, similar pattern Seed showed number undamaged beechnuts Medio Monte, while Gosco attacked insects. Conclusions Our results reflect that contrasting forests’ structure influence shifts consumers. reaffirms importance continuing studies throughout all address regional efforts preserving relict-ecological interactions.