マーキング法とすくい取り法によるツマグロヨコバイ個体数の推定

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  • Estimation of Population Density of the Green Rice Leafhopper (<i>Nephotettix cincticeps</i> UHLER) by the Mark-Recapture and the Sweeping Methods
  • マーキングホウ ト スクイ トリ ホウ ニ ヨル ツマグロヨコバイ コタイスウ ノ スイテイ

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Although the net-sweeping has widely been used for estimating the population density of small insects, this method often did not allow us to decide absolute density of the insect when the efficiency had not been known. Attempts were, therefore, made to compare the estimates of population density of the green rice leafhopper based on the sweeping and the mark-recapture methods. Sample unit in ordinary sweeping consisted of 20 strokes of the net, 40cm in diameter with a 120cm rod. In the estimation of density with the mark-recapture method, leafhopper adults collected by the net were immediately anaesthetized by CO2, marked on forewing with a quick-dry ink, and released again. Specimens used for the experiments on the efficiency of the light-trap were marked with coloured dye powder. Experiments were conducted in 1963 and 1964, the results being summarized as follows:<br>1) With BAILEY'S triple-catch method, estimated numbers of adults in the heading stage were 15∼20 per sq. m. in 1963 and 20 per sq. m. in 1964. Numbers of adults at the yellow ripe stage were 30 per sq. m. in 1963 and 55 per sq. m. in 1964 (Table 6).<br>2) Results of the net-sweeping conducted on 7 paddy fields and for 4 varieties of the rice plant were shown in Table 4. The sweeping method is considered to be trustworthy for the estimation of population density of the leafhopper, because of very small sample variance.<br>3) From the comparison of the population estimates based on the mark-recapture and the sweeping methods, it is concluded that, when the sky is clear, 10 to 30 per cent of the adult leafhoppers inhabiting the well-grown paddy field may be caught by the sweeping method.<br>4) From the results of experiment where dyed adults were released at points with different distances from the light trap, an approximate representation of the relationship between the distance and the ratio of the light-trap catch could be shown (Fig. 4).

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