Experimental studies on the distribution of the aphid counts

Population Ecology - Tập 6 Số 2 - Trang 79-87 - 1964
Masae Shiyomi1, Kazuo Nakamura2
1Laboratory of Experimental Design, National Institute of Agricultural Sciences, Tokyo
2Division of Entomology, National Institute of Agricultural Sciences, Tokyo

Tóm tắt

SummaryThe present paper dealt with the sequential changes of the distribution pattern of apterous females aphid populations, that were artificially settled at the beginning on the experimental barley ‘field'. The aphids were settled at random or even with a fixed denisty per plant. For five or six days after the settling, the number of individuals followed the negative binomial distributions in all cases while the parameters k and p were varying. The estimated values of k were rather small for the first one week after the settling, which may suggest that the number of moving aphids between plants was relatively small and the degree of concentration expressing the intrinsic increase was high. After that, as the number of individuals increased, the number of moving aphids between plants would be considered to be increased. It was found that with the lapse of time the degree of concentration decreased or k became larger.The distribution of aphids per blade in a plant was also described briefly.

Từ khóa


Tài liệu tham khảo

10.2307/3001918

10.1071/AR9500018

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Thông tin
Thông tin xuất bản

Population Ecology

Tập 6 Số 2

79-87

Thông tin tác giả