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

作　　者：Ernesto CRodríguez-Ramírez Levinn Camacho-Islas Ana Paola Martínez-Falcón Isolda Luna-Vega Pilar Carbó-Ramírez 

机构地区：[1]Laboratorio de Dendrocronología,Universidad Continental,Huancayo,Perú [2]Laboratorio de Biogeografía y Sistemática,Universidad Nacional Autonoma de México,Ciudad de México,Mexico [3]Centro de Investigaciones Biológicas,Universidad Autónoma de Estado de Hidalgo,Hidalgo,Mexico [4]Independent Researcher,Oulu,Finland

出　　处：《Avian Research》2021年第4期576-590,共15页鸟类学研究（英文版）

基　　金：granted by the postdoctoral fellowship CONACYT 2019–2020;funded by the DGAPA PAPIIT IN220621 project

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

关 键 词：Avian seed consumers Bird species Synchronous seed production Tropical montane cloud forest TURNOVER Zentrygon albifacies 

分 类 号：Q958.1[生物学—动物学]