Sharing a predator: can an invasive alien pest affect the predation on a local pest?
Sharing a predator: can an invasive alien pest affect the predation on a local pest?
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DOI：
10.1007/s10144-013-0371-8
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发表时间：
2013-07-01
影响因子：
1.7
通讯作者：
Desneux, Nicolas
中科院分区：
文献类型：
--
作者：
Bompard, Anais;Jaworski, Coline C.;Desneux, Nicolas
入侵物种可以强烈影响生态系统中的生物相互作用，直接或间接地与当地物种相互作用。在欧洲番茄温室中，外来入侵害虫Tuta absoluta可能会影响其他害虫如粉虱的种群动态。除了对寄主植物造成危害和与当地害虫竞争资源外，这种外来物种还可能对当地害虫产生捕食介导的相互作用。通常用于防治粉虱的生物防治剂也可以捕食T。这可能会改变当地害虫种群的动态。在一个由一种盲蝽类捕食者Macrolophus pygmaeus和两种害虫T.和当地的烟粉虱，烟粉虱，在温室番茄。结果表明，资源竞争和捕食者介导的相互作用同时发生。在共同捕食者存在的情况下，T.绝对是B。烟粉虱[B增加高达5.9倍。烟粉虱幼虫（卵+幼虫）4周后]。但在长期内，T.绝对是B。烟粉虱，即，10周后B.烟粉虱在入侵害虫的存在下降低了7.3倍。我们强调通才捕食者在管理本地和外来入侵害虫种群的关键作用，捕食者介导的间接相互作用的强度和方向可以取决于考虑的时间尺度。
Invasive species can strongly affect biotic interactions in ecosystems, interacting both directly and indirectly with local species. In European tomato greenhouses, the invasive alien pest Tuta absoluta may impact the population dynamics of other pests like whiteflies. Besides inducing damages to the host plant and competing for resources with local pests, this alien species may exert a predator-mediated interaction on local pests sharing common natural enemies. Biocontrol agents usually used against whiteflies may also prey upon T. absoluta and this could alter the dynamics of local pest populations. We evaluated possible resource competition and predator-mediated interactions in a system involving one mirid predator Macrolophus pygmaeus and two pests, T. absoluta and a local whitefly, Bemisia tabaci, on greenhouse tomatoes. Results showed that both resource competition and predator-mediated interactions occurred simultaneously. In the presence of the shared predator, there was a short-term positive effect of T. absoluta on B. tabaci [up to 5.9-fold increase of B. tabaci juveniles (egg + larvae) after four weeks]. However, in the long-term there was a negative predator-mediated interaction of T. absoluta on B. tabaci, i.e., after ten weeks the density of B. tabaci was 7.3-fold lower in the presence of the invasive pest. We emphasize the critical role of generalist predators in managing both local and invasive alien pest populations and that the strength and direction of predator-mediated indirect interactions can depend on the time scale considered.