Vector Mosquitoes of Japanese Encephalitis (Diptera: Culicidae) in Northern Thailand: Seasonal Changes in Larval Community Structure

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  • Vector Mosquitoes of Japanese Encephali

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Larval mosquito communities in rice fields were examined monthly for 2 years at 3 study areas (15 subareas) near Chiangmai, Thailand. the temporal and spatial variations of community structure were analyzed based on the similarity of species composition among mosquito communities. Subareas were grouped depending on the similarity of the species composition. A large cluster which was composed of several small groups of subareas supporting mosquito communities of a similar species composition was observed in the rainy season. In the subareas of the large cluster, 2 Japanese encephalitis (JE) vector mosquitoes, Culex vishnui THEOBALD and C. tritaeniorhynchus GILES, occupied more than 60% of the mosquito communities, and a large number of JE vectors appeared from the rice fields. In the dry season, the large cluster of subareas disappeared and the species composition of the mosquito community varied greatly among the subareas. The successional change of mosquito colonization and an asynchronous cultivation of rice plants were suggested as important ecological factors related to the development of rice field mosquito communities.

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