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首页> 外文期刊>Journal of Medical Entomology >Habitat preferences and phenology of Ochlerotatus triseriatus and Aedes albopictus (Diptera : Culicidae) in southwestern Virginia
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Habitat preferences and phenology of Ochlerotatus triseriatus and Aedes albopictus (Diptera : Culicidae) in southwestern Virginia

机译：弗吉尼亚州西南部三栖s鱼和白纹伊蚊的栖息地偏好和物候

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Recently, the number of reported human cases of La Crosse encephalitis, an illness caused by mosquito-borne La Crosse virus (LAC), has increased in southwestern Virginia, resulting in a need for better understanding of the virus cycle and the biology of its vectors in the region. This study examined the spatial and temporal distributions of the primary vector of LAC, Ochlerotatus triseriatus (Say), and a potential secondary vector, Aedes albopictits (Skuse). Ovitrapping surveys were conducted in 1998 and 1999 to determine distributions and oviposition habitat preferences of the two species in southwestern Virginia. Mosquitoes also were collected for virus assay from a tire dump and a human La Crosse encephalitis case site between 1998 and 2000. Oc. triseriatus and Ae. albopictus were collected from all ovitrap sites surveyed, and numbers of Oc. triseriatus eggs generally were higher than those of Ae. albopictus. Numbers of Oc. triseriatus remained high during most of the summer, while Ae. albopictus numbers increased gradually, reaching a peak in late August and declining thereafter. In Wise County, relative Ae. albopictus abundance was highest in sites with traps placed in open residential areas. Lowest numbers of both species were found in densely forested areas. Ovitrapping during consecutive years revealed that Ae. albopictus was well established and overwintering in the area. An oviposition comparison between the yard and adjacent forest at a human LaCrosse encephalitis case site in 1999 showed that Ae. albopictus preferentially oviposited in the yard surrounding the home, but Oc. triseriatus showed no preference. LAC isolations from larval and adult collections of Oc. triseriatus females from the same case site indicated the occurrence of transovarial transmission.
机译：最近，在弗吉尼亚州西南部，人类报告的由蚊子传播的拉克罗斯病毒（LAC）引起的疾病拉克罗斯脑炎的人类病例数量有所增加，因此需要更好地了解病毒周期及其媒介生物学在该区域。这项研究检查了LAC的主要载体Oslerotatus triseriatus（Say）和潜在的次要载体Aedes albopictits（Skuse）的时空分布。 1998年和1999年进行了产卵调查，以确定弗吉尼亚州西南部两个物种的分布和产卵环境。在1998年至2000年之间，还从一个轮胎垃圾场和一个人的La Crosse脑炎病例中收集了蚊子用于病毒分析。 triseriatus和Ae。从所有接受调查的产卵器位点收集白化病患者的白细胞总数。 Triseriatus卵通常高于Ae。白化病。 oc的数量夏季的大部分时间里，triseriatus仍然很高，而Ae。白化病数量逐渐增加，在八月下旬达到峰值，此后下降。在智县，亲爱的。在空旷的居民区放置陷阱的地方，白带菌的丰度最高。在茂密的森林地区发现这两种物种的数量最少。连续多年的卵母细胞揭示了Ae。 albopictus已经建立并且在该地区过冬。 1999年人类LaCrosse脑炎病例现场院子和邻近森林之间的产卵比较表明，Ae。 albopictus优先在房屋周围的院子里产卵，但是Oc。 triseriatus没有表现出偏好。从Oc的幼虫和成年收集物中分离出LAC。同一病例中的Triseriatus雌性表明发生了卵巢传播。

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