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Spatial and host-plant partitioning between coexisting Bemisia tabaci

机译:共存烟粉虱之间的空间和寄主植物分区

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摘要

The whitefly Bemisia tabaci is a species complex including at least 24 morphologically indistinguishable species among which the Mediterranean (Med) and Middle East-Asia Minor I (MEAMI) species containing the biotypes commonly known as Q and B, respectively. These B and Q biotypes (hereafter referred to as MEAMI and Med species) are the most invasive agricultural pests of the B. tabaci complex worldwide. The spread of MEAMI and more recently of Med species into regions already invaded by other B. tabaci populations has been frequently seen to lead to their displacement by Med species. In Tunisia, in contrast to usual observations in the Mediterranean basin, Med and MEAMI species have been seen to co-occur in the main crop producing regions. Based on fine population genetics and field spatial distribution analyses, we found that the co-existence of these two interacting species was based on habitat partitioning including spatial and host-plant partitioning. Although they co-occurred at larger spatial scales, they excluded one another at sample scale. We observed neither spatial overlapping nor hybridization between MEAMI and Med B. tabaci. Vegetable crops were the main hosts for MEAMI specimens while 99.1% of the B. tabaci collected on the ornamental, Lantana camara, were Med specimens. Different patterns of genetic diversity were observed between the two species, as well as among Med specimens sampled on the ornamental versus vegetables, with the highest genetic diversity found in Med B. tabaci sampled on L. camara. These findings lead us to focus our discussion on the role played by lantana, human pressure, and competition, in the spatial and genetic patterns observed in the whitefly B. tabaci.
机译:烟粉虱烟粉虱是一种物种复合体,包括至少24种形态上无法区分的物种,其中地中海(Med)和中东亚小I(MEAMI)物种分别含有通常称为Q和B的生物型。这些B和Q生物型(以下称为MEAMI和Med物种)是全世界烟粉虱综合危害性最大的农业害虫。人们经常看到,MEAMI和最近的Med物种向已被其他烟粉虱种群入侵的地区扩散,导致其被Med物种取代。在突尼斯,与地中海盆地的常规观察相反,已发现Med和MEAMI物种在主要农作物产区同时存在。基于优良的种群遗传学和田间空间分布分析,我们发现这两个相互作用物种的共存是基于栖息地分区,包括空间分区和宿主植物分区。尽管它们同时出现在较大的空间尺度上,但它们在样本尺度上却相互排斥。我们既没有观察到空间重叠也没有MEAMI和烟粉虱之间的杂交。蔬菜作物是MEAMI标本的主要寄主,而从观赏马Lan丹(Lantana camara)上采集的烟粉虱99.1%是Med标本。在两个物种之间,以及在观赏植物和蔬菜上采集的地中海标本中,观察到了不同的遗传多样性模式,其中在L. camara上采集的烟粉虱中遗传多样性最高。这些发现使我们集中讨论了马丹,烟粉虱和烟粉虱中观察到的空间和遗传模式中马tana丹,人类压力和竞争的作用。

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