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首页> 美国卫生研究院文献>other >Lack of Genetic Differentiation between Contrasted Overwintering Strategies of a Major Pest Predator Episyrphus balteatus (Diptera: Syrphidae): Implications for Biocontrol
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Lack of Genetic Differentiation between Contrasted Overwintering Strategies of a Major Pest Predator Episyrphus balteatus (Diptera: Syrphidae): Implications for Biocontrol

机译：害虫捕食者主要的食足雌（Episyrphus balteatus）（双翅目：Syrphidae）的相反越冬策略之间缺乏遗传差异：对生物防治的意义。

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Winter ecology of natural enemies has a great influence on the level and efficiency of biological control at spring. The hoverfly Episyrphus balteatus (DeGeer) (Diptera: Syrphidae) is one of the most important natural predators of crop aphids in Europe. Three different overwintering strategies coexist in this species which makes it a good model in order to study ecologically-based speciation processes. The purpose of this study was to determine whether E. balteatus populations with alternative overwintering strategies are genetically differentiated. To that aim, we developed 12 specific microsatellite markers and evaluated the level of neutral genetic differentiation between E. balteatus field populations that overwinter in the three different ways described in this species (i.e. migration, local overwintering at a pre-imaginal stage, and local overwintering at adult stage). Results showed a lack of neutral genetic differentiation between individuals with different overwintering strategies although there are strong ecological differences between them. All pair-wise FST values are below 0.025 and non-significant, and Bayesian clustering showed K = 1 was the most likely number of genetic clusters throughout our sample. The three overwintering strategies form one unique panmictic population. This suggests that all the individuals may have genetic material for the expression of different overwintering phenotypes, and that their commitment in one particular overwintering strategy may depend on environmental and individual factors. Consequently, the prevalence of the different overwintering strategies would be potentially modified by landscape engineering and habitat management which could have major implications for biological control.
机译：天敌的冬季生态对春季生物防治的水平和效率有很大影响。食蚜蝇（Episyrphus balteatus，DeGeer）（双翅目：Syrphidae）是欧洲农作物蚜虫最重要的天然天敌之一。在该物种中共存在三种不同的越冬策略，这使其成为研究基于生态的物种形成过程的良好模型。这项研究的目的是确定采用替代性越冬策略的巴氏大肠杆菌种群是否在遗传上有所区别。为此，我们开发了12种特定的微卫星标记，并评估了以该物种描述的三种不同方式越冬的巴尔提斯野外田鼠种群之间的中性遗传分化水平（即迁移，想象前阶段的局部越冬和局部在成年阶段越冬）。结果表明，尽管越冬策略之间存在很大的生态差异，但他们之间缺乏中性的遗传分化。所有成对的FST值均低于0.025，且不显着，并且贝叶斯聚类表明K = 1是整个样本中最可能的遗传簇数。三种越冬策略形成了一个独特的恐慌种群。这表明所有个体都可能具有表达不同越冬表型的遗传材料，并且他们对一种特定越冬策略的承诺可能取决于环境和个体因素。因此，景观工程和栖息地管理可能会改变不同越冬策略的流行程度，这可能会对生物防治产生重大影响。

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