Mosquito species와 그 larval breeding sources의 水質과의 關係 : [弟一報] 서울地方 Seoul Area = Chemical Nature of Mosquito Larval Breeding Waters in Relation to Mosquito Species

다국어 초록 (Multilingual Abstract)

This paper covers the results of chemical analysis made on the various mosquito larval breeding sources, and the frequencies of larvae occurrence by different breeding waters. The chemical analysts included measurements of pH range, potassium permanganate consumption rate, ammonia, nitrites and nitrates. One hundred water samples were collected from different mosquito breeding sources in and around Seoul city during the period 15 June to the end of October 1961.
The following conclusions were made:
1) Percentages of larvae occurrence, by the type of breeding sources were; Anopheles sinensis occupied 46.7% of the total larvae collected from rice paddies, Culex pipiens occupied 73.3% from artificial containers, Aedes koreicus 46.9% and Aedes albopictus 50% from stone pools.
2) pH ranges of the larval breeding waters had a broad spread varying 7.07.8 with a mean value of 6.5. Both larvae of Anopheles sinensis and Culex pipiens were found to live in waters with a pH range from 5.0 to 7.8, while Aedes species showed a preference for waters slightly acid (pH 6.07.2). The difference of pH ranges between Culex pipiens and Aedes koreicus was statistically significant, since t-value 2.3, p<0.05.
3) The potassium permanganate consumption rate of breeding waters was the highest in Culex pipiens and Anopheles sinensis, then the Aedes species next, and the lowest in Culex vagans. Statistical differences in consumption rates among mosquito species were all found significant, since t-tests indicated as follows ;
Species : KMnO4 Consumption rate (ppm), Mean Value
Culex pipiens 86.79 1 t=4
Culex vegans 22.35) p<0.001
Culex pipiens 86.791 t=3.2
Aedes koreicus 34.68 p<0.01
Anopheles sinensis 73.41) t=3.3
Culex vagans 22.351 p<0.01
4. The contents of ammonia, nitrates were higher in the breeding waters of Culex pipiens than other sources in which other species were bred. The species of Culex pipeins preferred waters more ammonia nitrogen then Anopheles sinensis and the difference of the content in the breeding waters of these species was statistically significant.