关键词: 台湾蠛蠓, 密度, 季节消长, 生境

Abstract: Objective To investigate the population density and seasonal fluctuation of Lasiohelea taiwana in Ningnan county, Sichuan province, China. Methods Three types of habitats (urban, suburban, and rural areas) were selected as monitoring sites. Using the human trap method, researchers exposed their legs to L. taiwana to induce biting in a fixed time period. The biting data of L. taiwana were recorded, and the biting index was calculated. Furthermore, the meteorological data of Ningnan county were collected and analyzed. Results The daily density of L. taiwana in Ningnan county showed two peaks at 12:00[62.0 midges/(person·15 min)] and 16:00[64.0 midges/(person·15 min)]. In terms of seasonal fluctuation from 2018 to 2019, L. taiwana had not been detected from January to May, and began to appear in late June. Its density reached the first peak in September and the second peak at the end of October. Then it decreased rapidly in November until it was undetectable in December. The overall mean density index from June to November were 85.6 midges/(person·15 min) in 2018 and 52.4 midges/(person·15 min) in 2019. The densities of L. taiwana in different habitats were 183.9 midges/(person·15 min) in rural areas, 117.7 midges/(person·15 min) in suburban areas, and 20.0 midges/(person·15 min) in urban areas; 90.9 midges/(person·15 min) in bushes, 52.4 midges/(person·15 min) on lawns; 18.4 midges/(person·15 min) in the bushes on plains, and 5.8 midges/(person·15 min) in the bushes in hilly areas. Conclusion The daily density variation, seasonal fluctuation, and densities in different habitats of L. taiwana in Ningnan county have been preliminarily mastered, which provides a scientific basis for the control of L. taiwana.

Key words: Lasiohelea taiwana, Density, Seasonal fluctuation, Habitat