Thompson B H
Ann Trop Med Parasitol. 1976 Sep;70(3):343-54. doi: 10.1080/00034983.1976.11687130.
Five marking/recapture experiments were carried out on Simulium damnosum in the rain-forest of the United Republic of Cameroon, in order to determine the regression in biting density at increasing distances from the marking point. Flies were captured unfed, marked with fluorescent dust, and then released on the bank of a large river. Recaptures were made over the six-seven days after marking, at seven stations situated from 200 m to 79 km along a large river, from the marking site. Marked flies, which showed fluorescent pigment when examined under an ultraviolet lamp, were recovered at all seven sites. The ratios of the number of recaptures per man-hour at each distant site to the recaptures per man-hour at the marking point were calculated to obtain values for the proportional biting density (Z). The value of Z declined in a logarithmic manner with increasing distance from the marking site, such that it fell to 0-1 at distances of 34-1 km on a large river, 5-5 km on a small river, and 1-5 km on a road leading away from a large river. The peak number of flies recaptured at the farthest sites along a large river (56 km and 79 km) occurred one day later than at the station nearest the marking point. The dispersal of marked flies which had fed on volunteers carrying Onchocerca volvulus microfilariae, was studied along a large river. Of three flies recaptured 24 km upstream from the marking point, one contained 10 infective larvae of O. volvulus.
在喀麦隆联合共和国的雨林中，对恶蚋进行了五次标记/重捕实验，以确定离标记点距离增加时叮咬密度的回归情况。未进食的苍蝇被捕获，用荧光粉尘标记，然后释放到大河边。在标记后的六到七天内，在沿着一条大河从标记点起200米至79公里处的七个站点进行重捕。在紫外线灯下检查时显示有荧光色素的标记苍蝇在所有七个站点都被捕获到。计算每个远处站点每人工小时的重捕数量与标记点每人工小时的重捕数量之比，以获得比例叮咬密度（Z）的值。Z值随着离标记点距离的增加呈对数下降，在大河上距离为34 - 1公里、小河流上距离为5 - 5公里以及远离大河的道路上距离为1 - 5公里时降至0 - 1。沿着大河在最远站点（56公里和79公里）重捕到的苍蝇数量峰值比离标记点最近的站点晚一天出现。对以携带盘尾丝虫微丝蚴的志愿者为食的标记苍蝇沿着一条大河的扩散情况进行了研究。在离标记点上游24公里处重捕到的三只苍蝇中，有一只含有10条盘尾丝虫感染性幼虫。
