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Habitat fragmentation alters predator satiation of acorns

Journal of Plant Ecology 2017年第1期10卷 67-73页

作者： Xin Tong Yu-Xuan Zhang Rong Wang Moshe Inbar Xiao-Yong Chen School of Ecological and Environmental Sciences East China Normal UniversityDongchuan Road 500Shanghai 200241China Department of Evolutionary and Environmental Biology University of Haifa199 Aba Khoushy Ave.Mount CarmelHaifa 31905Israel

Aims Acorn weevils(Curculio spp.),endoparasitic granivorous insects,impede recruitment of fagaceous trees,and in turn affect community structure and ecosystem *** studies have made considerable progress in elucidating local factors that contribute to seed predation by acorn weevils,but it is still not clear how habitat configurations interplay with local factors in influencing Curculio *** this study,we assessed the roles of crop size,landscape configurations(area and isolation)and their interactions on the predation rate of seeds by acorn *** We studied acorn weevils feeding on the seeds of Castanopsis sclerophylla(Fagaceae)on two peninsulas and nine islands with varying areas and isolation levels in the Thousand-island Lake in Chun’an County,Zhejiang Province of ***,crop size was estimated for 130 trees and predation status was assessed for 26207 seeds from these trees during two *** linear mixed models were performed to clarify how island area and isolation interplayed with crop size to determine predation rate on a single *** Findings A negative relationship was detected between crop size and seed predation rate,indicating predator satiation at the tree *** suggests that acorn weevils tend to stay sedentary once they have arrived at a suitable *** fragmentation had significant effects on seed predation such that predation rate was higher on larger,less isolated ***,the relationship between crop size and predation rate was significantly changed by both island area and *** finding highlighted that the effects of habitat isolation might be overlooked relative to those of habitat loss.

关键词： Castanopsis sclerophylla Curculio isolation limited dispersal predator satiation

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