Swanson J, Lancaster M, Anderson J, Crandell M, Haramis L, Grimstad P, Kitron U
Division of Environmental Health, Illinois Department of Public Health, Regional Office, Peoria, IL 61614, USA.
J Med Entomol. 2000 May;37(3):454-60. doi: 10.1093/jmedent/37.3.454.
In 1997, Aedes albopictus (Skuse) was discovered in Peoria, IL, a known focus of La Crosse (LAC) virus transmission. This accidental introduction provided an opportunity to determine whether Ae. albopictus would reemerge in the spring or summer and, if successful overwintering occurred, to follow changes in the geographic range of Ae. albopictus, and to compare its distribution to that of the local treehole mosquito and LAC vector Aedes triseriatus (Say). In 1998, 25 oviposition traps were placed in and around the area of the initial finding of Ae. albopictus, with adult collections by aspirators and larval collections from water-holding containers used to identify areas of additional activity. Ae. albopictus successfully survived the mild 1997-1998 El Niño winter, and expanded its range during 1998. By September 1998, Ae. albopictus oviposited in all 25 traps, including traps near and in wooded sites. Intensity of oviposition activity (number of eggs per positive trap) ranged from 20-40, lower than the range for Ae. triseriatus, which was as high as 175 eggs per infested trap in mid-August. Prevalence of Ae. albopictus increased through September, where as the prevalence of Ae. triseriatus declined starting in mid-July. Although direct competition between the two mosquito species cannot be inferred based on this surveillance effort, a gradual range expansion was observed, and Ae. albopictus eggs were collected in traps where initially only Ae. triseriatus oviposition activity was detected.
1997年，在伊利诺伊州皮奥里亚发现了白纹伊蚊（Skuse），该地是已知的拉克罗斯（LAC）病毒传播疫源地。这次意外引入为确定白纹伊蚊是否会在春季或夏季再度出现提供了契机，若其成功越冬，则可追踪白纹伊蚊地理分布范围的变化，并将其分布与当地树洞蚊及LAC病毒传播媒介三带喙库蚊（Say）的分布进行比较。1998年，在最初发现白纹伊蚊的区域及其周边放置了25个产卵诱捕器，通过吸虫器收集成虫，并从蓄水容器中收集幼虫，以确定其他活动区域。白纹伊蚊成功度过了1997 - 1998年温和的厄尔尼诺冬季，并在1998年扩大了其分布范围。到1998年9月，白纹伊蚊在所有25个诱捕器中产卵，包括靠近树木繁茂地区和树林中的诱捕器。产卵活动强度（每个阳性诱捕器中的卵数）在20 - 40之间，低于三带喙库蚊的范围，三带喙库蚊在8月中旬每个受侵染诱捕器中的卵数高达175个。白纹伊蚊的患病率在9月前不断上升，而三带喙库蚊的患病率从7月中旬开始下降。尽管基于此次监测工作无法推断这两种蚊种之间存在直接竞争，但观察到了白纹伊蚊分布范围的逐渐扩大，并且在最初仅检测到三带喙库蚊产卵活动的诱捕器中也收集到了白纹伊蚊的卵。
