マツノマダラカミキリ防除薬剤の野鳥と昆虫に関する影響

概要

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The effect of insecticide was sprinked by the helicopter on insects and wild birds was investigated at the pine forest(140-280m alt.)near Matsuyama City during 1986-1990. In the area investigated , 26 species of wild birds were found, of which the dominant species are japanese bunting Emberiza cioides BRANDT, the bulbul Hypsipetes amaurotis(TEMMINCK) and the swallow Hirundo rustica LINNAEUS. Suppose that the numbers investigated is 100% before treatment. The next day, the number was reduced to 48%, three weeks later, to 76% . The second treatment was given after about three weeks and the number of species fluctuated as the number of birds fluctuate. In the untreated area, both the number of birds and the number of species showed increase after treatment. In the treated area, on the next day of treatment, the decrease of the number of birds and the number of species was caused by the death of insects whici became the food for wild dirds.The number of insects on the plants and shrubs showed 1/10 decrease and one month later showed 1/2-1/3 decrease. Thenmber of insects which were killed by the treatment was 66 per m square by the first treatment and 36 per m square by the second treatment. Therefore it is assumed that the second treatment was given at the time when the insects were recovering and the insecticide given killed ,most insects.
松山東雲女子大学・松山東雲短期大学の論文