Enemy-free space is important in driving the host expansion of a generalist herbivore to an inferior exotic plant in a wetland of Yangtze Estuary
Enemy-free space is important in driving the host expansion of a generalist herbivore to an inferior exotic plant in a wetland of Yangtze Estuary
复制标题
无敌空间对于驱动长江口湿地中的多面食草动物向低等外来植物的寄主扩张非常重要
DOI：
10.1007/s10530-018-1845-6
复制
发表时间：
2019
影响因子：
2.9
通讯作者：
Wu Jie
中科院分区：
文献类型：
--
作者：
Zhang Jing;Ju Rui-Ting;Pan Hui;Pan Su-Feng;Wu Jie
外来植物和本地食草动物之间的新的相互作用可以由多种生态和进化过程驱动，但其潜在的机制很少从多营养的角度进行探索。在本研究中，我们研究了寄主植物质量和天敌对寄主植物利用的影响，这是近年来在长江口湿地从本地芦荟扩展到外来入侵互花米草的一种新的寄主植物，中国。田间种群调查结果表明，黄粉虫幼虫密度较高。空肠吸虫的INS显著较高。互花单细胞培养(SM)比INP.澳大利亚单一培养(PM)和补丁。互作植物群落(PIS)。尽管如此，一项室内饲养实验建议喂食ONS。互作显著降低幼虫生长率、蚕茧量、成虫寿命和雌虫终生繁殖力。Coenosain与P.澳大利亚人。尽管诱导了5龄幼虫的取食偏好，但1龄和3龄幼虫都是如此。群落明显偏爱叶片OFP。澳大利亚。互花似锦。这些结果与现场人口调查结果相矛盾。随后的田间试验表明，幼虫死亡率为1%。在SM <； PIS <； PM栖息地，群落显著增加。L的卵寄生率也有相同的变化趋势。由一种特殊的寄生线虫Laelia所寄生。总体而言，我们的研究认为，敌人的自由空间提供了入侵。互作花在推动寄主扩展中起着重要作用。这种劣质的外来植物。
Novel interactions between exotic plants and native herbivores can be driven by multiple ecological and evolutionary processes, but the underlying mechanisms have rarely been explored from a multitrophic perspective. In this study, we examined the effects of host plant quality and natural enemies on the host plant use of a native generalistLaelia coenosa, which was recently known to expand its host range from indigenousPhragmites australisto invasive exoticSpartina alterniflorain the wetlands of Yangtze Estuary, China. A field population survey showed that larval density ofL. coenosawas significantly higher inS. alternifloramonocultures (SM) than inP. australismonocultures (PM) and patches inS. alterniflora-dominated communities (PIS). Nonetheless, an indoor rearing experiment suggested feeding onS. alterniflorasignificantly reduced larval growth rate, cocoon weight, adult lifespan and female lifetime fecundity ofL. coenosain comparison withP. australis. Despite an induced feeding preference in 5th instar larvae, both 1st and 3rd instar larvae ofL. coenosasignificantly preferred leaves ofP. australisoverS. alterniflora. These results contradicted the field population survey. Subsequent field experiments showed larval mortality ofL. coenosasignificantly increased in habitats with SM < PIS < PM. The same trend was observed in the egg parasitism rate ofL. coenosaby a specialized parasitoidTelenomus laelia. Generally, our study suggests that the enemy-free space provided by the invasiveS. alterniflorais important in driving the host expansion ofL. coenosato this inferior exotic plant.