Tropical Medicine Unit, Federal University of Espírito Santo, Vitória-ES, Brazil.
J Med Entomol. 2013 May;50(3):598-602. doi: 10.1603/me12085.
This study compares the distribution of anopheline mosquitoes in a malaria-endemic municipality (MAL) and a malaria-free municipality (FREE) in an area of the Atlantic Forest in Brazil. Simultaneous quarterly nightly captures were made in three locations in each municipality. One Shannon light trap (Shannon light traps were home made according to specifications published in Am. J. Trop. Med. 1939; 19: 131-140) (SLT) and five CDC light traps (a kind of automatic trap fed by batteries of 12 V and 7 amp/h, with dry ice as a source of CO2; John W. Hock Company, Gainesville, FL) (CLT) (two in the canopy and three at ground level) were operated from 6:00 p.m. to 6:00 a.m. More specimens were captured in MAL (362 in SLTs and 126 in CLTs) than in FREE (66 in SLTs and 59 in CLTs). For the SLTs, Simpson's dominance index was similar in MAL and FREE (D = 0.15 versus D = 0.203, P > 0.7), but Shannon's diversity index was higher for MAL = 1.969 versus H = 1.641, P < 0.01). For the CLTs, Simpson's dominance index was higher in MAL (D = 0.416 versus 0.2688, P < 0.001), and the Shannon diversity index was higher in FREE (H = 1.5222 versus H = 1.115, P < 0.01). In SLTs, Anopheles (Kerteszia) cruzii s.l. frequencies were higher in MAL (chi2 = 23.39; P = 0.000001). In CLTs, An. cruzii s.l. was present in all strata in MAL but only in the canopy inside the forest in FREE (17 specimens). An. cruzii s.l. represented a higher proportion of anophelines in MAL (chi2 = 31; P < 0.000001). The factors that differed in these two areas were anopheline species density and An. cruzii s.l. abundance and distribution.
本研究比较了巴西大西洋森林地区一个疟疾流行市（MAL）和一个无疟疾市（FREE）的按蚊分布情况。在每个市的三个地点同时进行了每季度一次的夜间捕获。使用了一种 Shannon 灯诱捕器（Shannon light traps 是根据 Am. J. Trop. Med. 1939; 19: 131-140 中公布的规格自制的）（SLT）和五台 CDC 灯诱捕器（一种由 12 V 和 7 安培/小时的电池供电的自动诱捕器，以干冰为 CO2 源；John W. Hock Company，Gainesville，FL）（CLT）（两个在树冠层，三个在地面水平），从下午 6 点到早上 6 点运行。在 MAL 捕获的标本更多（SLTs 为 362 个，CLTs 为 126 个），而在 FREE 捕获的标本较少（SLTs 为 66 个，CLTs 为 59 个）。对于 SLTs，MAL 和 FREE 的 Simpson 优势指数相似（D = 0.15 与 D = 0.203，P > 0.7），但 MAL 的 Shannon 多样性指数更高（H = 1.969 与 H = 1.641，P < 0.01）。对于 CLTs，MAL 的 Simpson 优势指数较高（D = 0.416 与 0.2688，P < 0.001），FREE 的 Shannon 多样性指数较高（H = 1.5222 与 H = 1.115，P < 0.01）。在 SLTs 中，Kerteszia 属按蚊 s.l. 的频率在 MAL 较高（chi2 = 23.39；P = 0.000001）。在 CLTs 中，An. cruzii s.l. 在 MAL 中存在于所有地层，但仅在 FREE 森林内的树冠层存在（17 个标本）。An. cruzii s.l. 在 MAL 中占按蚊的比例较高（chi2 = 31；P < 0.000001）。这两个地区的不同因素是按蚊密度和 An. cruzii s.l. 的丰度和分布。
