Behavioural differences between Aphidius ervi populations from two tritrophic systems are due to phenotypic plasticity
Behavioural differences between Aphidius ervi populations from two tritrophic systems are due to phenotypic plasticity
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DOI：
10.1023/a:1021261305066
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发表时间：
2002-09-01
影响因子：
1.9
通讯作者：
Niemeyer, HM
中科院分区：
文献类型：
--
作者：
Daza-Bustamante, P;Fuentes-Contreras, E;Niemeyer, HM
古北区寄生蚜蚜Aphidius ervi Haliday（Hyactera，Aphidiidae）在其原产地寄生豆科蚜虫。在智利，它寄生于豆类和谷类蚜虫。本文从两个层次对这一特殊情况进行了研究：（1）A.对苜蓿上的豌豆蚜和小麦上的麦长管蚜进行了双重选择试验。豌豆-苜蓿寄主复合体（HPC）和S. avenae-wheat HPC的遗传结构;使用分子标记从两个来源的ervi种群。A的回答。ervi雌性对来自A. pisum-alfalfa HPC和S.在实验前的最后一代期间，无论寄生蜂的来源如何，燕麦-小麦HPC都显著高于它们所饲养的HPC。如前所述，这种寄生蜂的物种，产卵经验也是女性寄生蜂的偏好的主要相关性。另一方面，线粒体DNA片段的变异和使用总DNA的RAPD-PCR多态性表明，这些A. ervi种群。这些结果拒绝可能存在不同的宿主菌株，这种寄生蜂在智利。
The Palaeoarctic parasitoid Aphidius ervi Haliday (Hymenoptera, Aphidiidae) parasitises legume aphids in its region of origin. In Chile, it parasitises both legume and cereal aphids. This special situation was studied at two levels: (i) the host searching behaviour of A. ervi from two different tritrophic systems (Acyrthosiphon pisum on alfalfa and Sitobion avenae on wheat) was investigated in dual choice tests in a wind tunnel between odours from both A. pisum-alfalfa host plant complex (HPC) and S. avenae-wheat HPC, and (ii) the genetic structure of A. ervi populations from both sources using molecular markers. Responses of A. ervi females to volatile olfactory cues emanating from A. pisum-alfalfa HPC and S. avenae-wheat HPC were significantly higher towards the HPC on which they were reared during the last generation before experimentation, regardless of the origin of the parasitoid. As previously described for this parasitoid species, oviposition experience was also of major relevance in the preferences of female parasitoids. On the other hand, variation in mitochondrial DNA segments and RAPD-PCR polymorphism using total DNA showed the absence of host-based population structure and a high genetic homogeneity between these A. ervi populations. These results reject the possible existence of different host-strains of this parasitoid in Chile.