Abstract: Objective To study the spatial stability of vector abundance of Aedes albopictus in Shanghai, China, and to provide a basis for prevention and control of dengue fever. Methods From May to November 2019, sub-district/township-based surveillance of Ae. albopictus density was carried out in Shanghai using mosquito ovitraps. The global spatial autocorrelation Moran's I index was calculated to determine the spatial clustering pattern in the whole study area. Spearman's correlation coefficient was used to determine the correlation between the positive rates of mosquito ovitraps in administrative areas or sub-district/townships at different times. Kendall's coefficient of concordance (Kendall's W) was calculated to measure the agreement between rank orders of positive rates of mosquito ovitraps at different times. Results In 2019, the highest, lowest, and median mean positive rates of mosquito ovitraps per year were 8.70%, 1.88%, and 5.46%, respectively, for each administrative area in Shanghai, and were 30.21%, 0, and 5.51%, respectively, for each sub-district/township. Spatial analyses showed that the density of Ae. albopictus was higher in the west and north of the city. The Spearman's correlation coefficients on sub-district/township and administrative area scales were greater for 1 week before as compared with those for 3 weeks before and were greater for 3 weeks before as compared with those for 6 weeks before; the Spearman's correlation coefficients on an administrative area scale were greater than those on a sub-district/township scale. During the study period, the Kendall's W of positive rates of mosquito ovitraps was 0.627 in a sample unit of administrative areas (χ²=197.542, P<0.001), and was 0.436 in a sample unit of sub-districts/townships (χ²=1 802.154, P<0.001). Conclusion The spatial stability of positive rates of mosquito ovitraps on an administrative area scale is better than that on a sub-district/township scale. Therefore, attention should be paid to sub-districts/townships with abnormal density changes while the prevention and control measures are strengthened in administrative areas with a high density of Ae. albopictus.

Key words: Mosquito ovitrap, Aedes albopictus, Spatial stability

摘要： 目的 研究上海市白纹伊蚊媒介丰度的空间稳定性，为登革热防控提供依据。方法 2019年5－11月，在上海市以街镇为监测单位，采用诱蚊诱卵器法对白纹伊蚊密度进行监测。计算诱蚊诱卵器阳性率全局空间自相关Moran's I指数，探测整个研究区域内白纹伊蚊的空间聚集模式，使用Spearman相关系数计算不同时间行政区或街镇的诱蚊诱卵器阳性率之间的相关性，计算肯德尔和谐系数（Kendall's W）衡量诱蚊诱卵器阳性率等级顺序之间不同时间的一致性。结果 2019年上海市各行政区年平均诱蚊诱卵器阳性率最高为8.70%，最低为1.88%，中位数为5.46%；各街镇年平均诱蚊诱卵器阳性率最高为30.21%，最低为0，中位数为5.51%。空间分析显示全市西部和北部白纹伊蚊密度较高。街镇和行政区尺度上的Spearman相关系数均表现为：与1周前的Spearman相关系数均表现为高于与3周前的，与3周前的相关系数高于与6周前的，行政区尺度的Spearman相关系数大于街镇尺度。研究期间，以行政区为样本单元的诱蚊诱卵器阳性率的肯德尔和谐系数为0.627（χ²=197.542，P<0.001），以街镇为样本单元的诱蚊诱卵器阳性率肯德尔和谐系数为0.436（χ²=1 802.154，P<0.001）。结论 诱蚊诱卵器阳性率在行政区尺度空间稳定性好于街镇尺度。因此，在加强白纹伊蚊高密度行政区防控的同时，应关注密度异常变化的街镇区域。

关键词: 诱蚊诱卵器, 白纹伊蚊, 空间稳定性