Invasive oaks escape pre-dispersal insect seed predation and trap enemies in their seeds  

作　　者：MichałBOGDZIEWICZ Raul BONAL Josep MESPELTA Ewa M.KALEMBA Michael A.STEELE RafałZWOLAK 

机构地区：[1]Department of Systematic Zoology,Faculty of Biology,Adam Mickiewicz University,Poznań,Poland [2]CREAF,Cerdanyola del Valles,Catalonia,Spain [3]Forest Research Group,INDEHESA,University of Extremadura,Plasencia,Spain [4]DITEG Research Group,University of Castilla-La Mancha,Toledo,Spain [5]Laboratory of Seed Biochemistry,Institute of Dendrology,Polish Academy of Sciences,Kórnik,Poland [6]Department of Biology,Wilkes University,Wilkes-Barre,Pennsylvania,USA

出　　处：《Integrative Zoology》2018年第3期228-237,共10页整合动物学（英文版）

基　　金：This study was supported by the Polish National Science Foundation grant Preludium no.2015/17/N/NZ8/01565;while MB was supported by Polish Foundation for Science scholarship‘Start’,and Etiuda NSF grant no.2015/16/T/NZ8/00018;DNA sequencing was supported by PLAGANADO AGL2014-54739-R awarded to RB;MAS recognizes the support of the U.S.National Science Foundation(DEB-1556707).

摘　　要：Species introduced to habitats outside their native range often escape control by their natural enemies.Besides competing with native species,an alien species might also affect the native herbivores by introducing a new source of different quality food.Here,we describe the case of northern red oak(Quercus rubra)invasion in Europe.We collected data on insect(moth Cydia spp.and weevil Curculio spp.)seed predation of northern red oak in its native(USA,North America)and invasive(Poland,Europe)range,as well as for sessile oaks(Quercus petrea)in Europe.We also evaluated the quality of acorns as hosts for weevil larvae by collecting infested acorns and measuring weevil developmental success,and quantifying acorn traits such as seed mass,tannins,lipids and protein concentration.We used DNA barcoding to identify insects to the species level.The predation by moths was similar and very low in both species and in both ranges.However,red oaks escape pre-dispersal seed predation by weevils in Europe.Weevil infestation rates of northern red oak acorns in their invasive range were 10 times lower than that of sessile oaks,and also 10 times lower than that of red oaks in North America.Furthermore,even when weevils oviposited into northern red oaks,the larvae failed to develop,suggesting that the exotic host created a trap for the insect.This phenomenon might gradually decrease the local abundance of the seed predator,and further aid the invasion.

关 键 词：biotic invasions ecological trap enemy release hypothesis seed predation WEEVILS 

分 类 号：S76[农业科学—森林保护学]