Role of seed size, phenology, oogenesis and host distribution in the specificity and genetic structure of seed weevils (Curculio spp.) in mixed forests  

作　　者：Harold ARIAS-LECLAIRE Raúl BONAL Daniel GARCÍA-LÓPEZ Josep Maria ESPELTA 

机构地区：[1]CREAF,Centre for Ecological Research and Forestry Applications,Cerdanyola del Vallès,08193,Spain [2]Exact and Natural Sciences School,State Distance University of Costa Rica,UNED,Mercedes de Montes de Oca,San José,Costa Rica [3]Forest Research Group,INDEHESA,University of Extremadura,Plasencia,Spain [4]DITEG Research Group,University of Castilla-La Mancha,Toledo,Spain [5]Zoology Department,Autonomous University of Barcelona,Cerdanyola del Vallès,Spain

出　　处：《Integrative Zoology》2018年第3期267-279,共13页整合动物学（英文版）

基　　金：This research was supported by the projects FORASSEMBLY(CGL2015-70558-P)and PLAGANADO(AGL2014-54739-R)of the Spanish Ministry of Economy;the projects BEEMED(SGR913)(Generalitat de Catalunya)and PII1C09-0256-9052(Regional Government of Castilla-La Mancha and the European Social Fund);R.B.was funded by a contract of the Program Atracción de Talento Investigador(Gobierno de Extremadura).

摘　　要：Synchrony between seed growth and oogenesis is suggested to largely shape trophic breadth of seed-feeding insects and ultimately to contribute to their co-existence by means of resource partitioning or in the time when infestation occurs.Here we investigated:(i)the role of seed phenology and sexual maturation of females in the host specificity of seed-feeding weevils(Curculio spp.)predating in hazel and oak mixed forests;and(ii)the consequences that trophic breadth and host distribution have in the genetic structure of the weevil populations.DNA analyses were used to establish unequivocally host specificity and to determine the population genetic structure.We identified 4 species with different specificity,namely Curculio nucum females matured earlier and infested a unique host(hazelnuts,Corylus avellana)while 3 species(Curculio venosus,Curculio glandium and Curculio elephas)predated upon the acorns of the 2 oaks(Quercus ilex and Quercus pubescens).The high specificity of C.nucum coupled with a more discontinuous distribution of hazel trees resulted in a significant genetic structure among sites.In addition,the presence of an excess of local rare haplotypes indicated that C.nucum populations went through genetic expansion after recent bottlenecks.Conversely,these effects were not observed in the more generalist Curculio glandium predating upon oaks.Ultimately,co-existence of weevil species in this multi-host-parasite system is influenced by both resource and time partitioning.To what extent the restriction in gene flow among C.nucum populations may have negative consequences for their persistence in a time of increasing disturbances(e.g.drought in Mediterranean areas)deserves further research.

关 键 词：Corylus avellana Curculio spp. genetic structure Quercus spp. trophic breadth 

分 类 号：S76[农业科学—森林保护学]