Effects of environmental changes on vector mosquitoes

环境变化对媒介蚊的影响。该项目侧重于可能受环境变化影响的病媒蚊子的变化。根据在东南亚进行的实地研究，该项目揭示如下。在疟疾主要传播媒介之一的小按蚊群中，发现了来自日本石垣岛的新兄弟种。在印度尼西亚的龙目岛，有一个物种占据了类似的栖息地，被区分为An。flaviorstris。我们对泰国北部30年的疟疾病媒密度和环境记录进行了统计分析，发现3种主要的疟疾病媒，安。最小群，An。黄斑斑疹组和黄斑斑疹组。传播区（TA）密度未降低。而非传播区（NTA）密度明显下降。除了人口迁移外，一个地区的病媒密度也被认为是另一个决定因素。利用卫星影像和航空影像进行的20世纪80年代和90年代两个时期的土地利用分类也证实了TA的森林减少幅度小于NTA。提出了森林砍伐对疟疾病媒的影响。关于登革热媒介，检查了各种收集的埃及伊蚊和伊蚊。蚊。对人类存在的吸引力较强。蚊。另一方面，Ae。白纹伊蚊对植被有很强的吸引力。全面评估一个环境。极小组偏爱的新方法受到了挑战。安的景观构成。利用固定方案下拍摄的数码照片对最小生境进行了分析。植被覆盖对该物种侵染的重要性得到了证实。该方法简便易行，可用于媒介蚊虫生境的粗略评价。

Effects of environmental changes on vector mosquitoes. This project focused on variations in vector mosquitoes possibly affected by environmental changes. Based on field studies conducted in southeast Asia, the project revealed as follows. Among Anopheles minimus group, one of main malaria vectors, we found new sibling species from Ishigaki Island, Japan. A species occupied the similar habitat in lombok island, Indonesia was distinguished as An. flaviorstris. our statistical analysis in 30 years record of malaria vector density and environment in northern Thailand revealed that 3 main malaria vectors, An. minimus group, An. maculatus group and An. dirus group, had not reduced in density in transmission areas (TA). While the densities had clearly reduced in non-transmission areas (NTA). In addition to migration of people, vector density in an area also was indicated as another determinant. Less decrease of the forest in the TA than in the NTA also was confirmed by landuse classification between two periods of 1980s and 1990s using satellite images and aerographs. Effect of deforestation on malaria vectors was suggested. Concerning to dengue vectors, various collections were examined for Aedes aegypti and Ae. albopictus. The attractiveness to human presence was strong in Ae. aegypti. On the other hand Ae. albopictus was rather strongly attracted to vegetation. To totally evaluate an environment to which An. minimus group favors a new approach was challenged. Landscape composition of An. minimus habitats was analyzed using digital photographs taken under fixed protocol. The importance of vegetation cover was confirmed for infestation of the species. This easy method was considered worth while to apply to rough evaluation of vector mosquito habitat.