水田におけるシナハマダラカ幼虫の生息状況と水質条件

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The relationships between physico-chemical characters of water in rice fields and their suitability for breeding of the mosquito larvae, Anopheles sinensis were studied during the summer in 1974. The census fields (B-G) were located in the suburb of Urawa city 20km north of Tokyo. Census fields ranged 0.5-3.0 are containing about 1,600 hills of rice plants per are. The water sample was taken with the use of the quadrat device (25×25cm) which was pushed firmly into the bottom mud in rice field (Ikemoto, 1976). Temperature, quantity, pH, and concentration of DO and NH_4-N of the water sampled were determined with the instruments or by the chemical analysis. The collected immature mosquitoes were classified into larvae of successive instars and pupae. It was shown that there is a positive correlation between the number of larvae (pupae inclusive) and the concentration of NH_4-N in the water sampled within the field at the same time. Moreover, the relation of the mean number of immature mosquitoes and the mean concentration of NH_4-N in each field during the summer was shown to be positive in correlation, at least, within the range from 0.1 to 0.4ppm of concentration. However, the relations between the larval density and the other characters of the water were not clear. Some discussions were given on the relation between the spatial distribution patterns of immature stages of this mosquito (Ikemoto, 1978) and the heterogeneity of the habitat water conditions presented in this paper. Further studies are needed to prove the propriety of the assumption that the NH_4-N concentrations within a field or among the fields have some positive relations with the oviposition preference of adults, the abundance of immature stages and their survival rates.
1979-06-15

水田におけるシナハマダラカ幼虫の生息状況と水質条件

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