| 英文摘要 |
The geographical distribution of dengue vectors in Taiwan may be affected by climate change. Therefore, we use ovitraps, gravitraps, container surveys, and sweep nets to investigate the geographical and altitudinal distribution of dengue vectors in Taiwan. The data is used to project the current and future geographical distribution of the vectors in Taiwan under different climate change scenarios. Moreover, a routine surveillance program is conducted in regions of interest, including a few villages located in Chiayi City and Yunlin County, tire recycling plants, 2 attractions with high altitudes, and 2 large railway stations to explore the evidence for the invasion of vectors to areas not recorded before by transportation networks. As of the 44th week in 2023, we have finished the investigation in a total of 182 10*10km2 grids through 1,281 times surveys, including 170 grids located in southern Taiwan. Aedes albopictus and Ae. aegypti were recorded in 175 and 26 grids, respectively, and both species were recorded simultaneously in 26 grids. Since this project started in 2022, Ae. albopictus and Ae. aegypti had recorded in 349 and 45 grids, respectively, and both species were recorded simultaneously in 45 grids in Taiwan. The northernmost record of Ae. aegypti was in Xinying District, Tainan City, with the highest altitude less than 1,000m. Ae. albopictus was distributed throughout Taiwan, with the highest altitude higher than 1,500 m. Compared with the previous records, Ae. albopictus was found at a higher altitude. Besides, each Ae. aegypti was found in Beigang Town, Yunlin County, and Banqiao Station, New Taipei City last year. This year, each Ae. aegypti was found in Jhongpu Town, Chiayi County, and Xinwuri Station, Taichung City. However, none of the places has found Ae. aegypti at the same place again since then. This indicates that those Ae. aegypti may have been migrated by the travelers and still had not yet been established. No Ae. aegypti was found but Ae. albopictus in tire recycling plants and 2 attractions, including Qingjing Farm and Alishan National Forest Recreation Area. Both of them were situated in a high altitudinal area with a large number of passengers visiting. Furthermore, the investigation data were analyzed by ENFA (Environment Niche Factor analysis) to project mosquito distribution from 2022 to 2023. It has revealed that the potential altitudinal distribution of Ae. albopictus is up to 1,500m whereas Ae. aegypti is less than 1,000m and is limited to the southern part, including Chiayi City, Tainan City, Kaohsiung City, Pingtung County, and Taitung City. To gather academic opinions, we have completed one expert consultation meeting focusing on the investigation results and the projection of the distribution of Ae. aegypti and Ae. albopictus. Finally, we have summarized relevant suggestions to for the Ministry of Environment to plan an adaptation action plan to reduce the impact brought by the change of geographical distribution undergone in vector.
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