Gurevitz Juan M, Ceballos Leonardo A, Kitron Uriel, Gürtler Ricardo E
Laboratorio de Eco-Epidemiología, Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, Argentina.
J Med Entomol. 2006 Mar;43(2):143-50. doi: 10.1603/0022-2585(2006)043[0143:fiotih]2.0.co;2.
Flight dispersal of Triatoma infestans Klug is probably the most important mechanism for house reinfestation at a village scale after residual spraying with insecticides. The aim of the current study was to estimate the flight initiation probability of field-collected T. infestans and to assess how this probability was affected by sex, adult age, partial bloodmeal, and the presence of a host inaccessible for feeding. Four experimental series, each consisting of three to six consecutive nights and repeated measurements of flight initiation on each individually marked bug, were carried out in experimental huts inside closed cages under natural climatic conditions. We demonstrate that flight initiation probability of T. infestans is much higher than previously reported, responds to temperature in a sigmoid manner, and is higher in females than males, and that the frequency distribution of the number of flights per individual is highly aggregated in female and male bugs. The age of adults had strong effects on flight initiation, whereas the presence of an inaccessible host and a partial bloodmeal exerted no significant effects in models controlling for the effects of bug weight-to-length ratio. The high flight potential found is consistent with the rapid changes in reinfestation patterns observed in the field. The present estimates of flight probabilities and the identification of factors modifying them provide essential knowledge for modeling reinfestation patterns and for improving control strategies of T.
在使用杀虫剂进行室内滞留喷洒后，克氏锥蝽的飞行扩散可能是村庄层面房屋再次受侵扰的最重要机制。本研究的目的是估计野外采集的克氏锥蝽的飞行起始概率，并评估该概率如何受到性别、成虫年龄、部分饱血以及存在无法取食的宿主的影响。在自然气候条件下封闭笼子内的实验小屋中进行了四个实验系列，每个系列由三到六个连续夜晚组成，并对每只单独标记的虫子的飞行起始进行重复测量。我们证明，克氏锥蝽的飞行起始概率比先前报道的要高得多，对温度呈S形响应，雌性高于雄性，并且每只虫子飞行次数的频率分布在雌性和雄性虫子中高度聚集。成虫年龄对飞行起始有强烈影响，而在控制虫体重量与长度比影响的模型中，存在无法取食的宿主和部分饱血没有显著影响。发现的高飞行潜力与在野外观察到的再次侵扰模式的快速变化一致。目前对飞行概率的估计以及对改变这些概率的因素的识别为模拟再次侵扰模式和改进克氏锥蝽的控制策略提供了重要知识。
