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首页> 外文期刊>Journal of Economic Entomology >High Genetic Diversity and No Population Structure of the New World Screwworm Fly Cochliomyia hominivorax (Diptera: Calliphoridae) on a Microgeographic Scale: Implications for Management Units
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High Genetic Diversity and No Population Structure of the New World Screwworm Fly Cochliomyia hominivorax (Diptera: Calliphoridae) on a Microgeographic Scale: Implications for Management Units

机译：新世界螺丝虫飞行耳蜗（Diptera：Calliphoridae）的高遗传多样性和没有人口结构在微观图规模上：管理单位的影响

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The New World screwworm fly Cochliomyia hominivorax (Coquerel, 1858) (Diptera: Calliphoridae) is an important livestock pest endemic to the Americas that has been eradicated from North and continental Central America with a control program based on the Sterile Insect Technique (SIT). The establishment of target management units is a strategic step in the implementation of new control programs, which can be achieved using genetic studies of natural populations. Previous studies of New World screwworm fly populations were conducted on the continental scale and identified four main groups: two in South America and two in the Caribbean. However, studies within these groups are needed to determine which smaller geographic areas can be treated as management units. Here, we analyze the genetic variability distribution and the population demographic signals of the New World screwworm fly in a 6,000 km(2) area located along the border of Brazil and Uruguay.This area was the subject of the first control pilot program conducted in South America. We studied eight microsatellite loci and sequences from two mitochondrial DNA regions in individuals sampled at 20-25 livestock breeding farms. We observed no population structure and found high genetic variability on the geographical scale sampled for both molecular markers. Our microsatellite data suggest that these populations are not in equilibrium, and demographic analyses based on mitochondrial data indicate population expansion.These results suggest that this geographic scale is not adequate for future New World screwworm fly management in South America.
机译：新大陆螺旋蝇Cochliomyia hominivorax（Coquerel，1858）（双翅目：丽蝇科）是美洲特有的一种重要家畜害虫，已通过基于无菌昆虫技术（SIT）的控制计划从北美和中美洲大陆根除。建立目标管理单位是实施新控制计划的一个战略步骤，这可以通过对自然种群的遗传研究来实现。以前对新大陆螺旋虫蝇种群的研究是在大陆范围内进行的，并确定了四个主要种群：两个在南美，两个在加勒比海。然而，需要在这些群体中进行研究，以确定哪些较小的地理区域可以被视为管理单元。在这里，我们分析了位于巴西和乌拉圭边境6000公里（2）地区的新大陆螺旋虫的遗传变异性分布和人口统计学信号。这一地区是在南美洲进行的第一个控制试点项目的主题。我们研究了20-25个家畜养殖场样本中两个线粒体DNA区域的8个微卫星位点和序列。我们没有观察到群体结构，并发现两个分子标记在地理尺度上都具有很高的遗传变异性。我们的微卫星数据表明，这些种群并不处于平衡状态，基于线粒体数据的人口统计分析表明，种群在扩大。这些结果表明，这种地理规模不足以在南美洲进行未来新大陆螺旋虫蝇的管理。

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