羽化曲線と環境の生態的条件

概要

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The adults do not emerge simultaneously even if they develope from a single batch of eggs deposited at the same time and the sequential frequency of their emergence is like the normal curve, but unsymmetrical. NISIKAWA (1939) found that this curve agrees well with the normal distribution when the reciprocal transformation is made in time scale. This has been considered as a good statistical model of the emergence curve. When the azuki bean weevil, Callosobruchus chinensis was reared under three different conditions of atmospheric moisture, the resulted emergence curves were not so different from each other, excepting the regular change in the standard deviation. The curves obtained agree well with the statistical model (Figs. 1 and 2). When the rearing density of the weevil was changed, the shape of the emergence curve changes. With advancing density the skewed part of the right hand portion of the curve disappears and it approaches to a normal curve, and the standard deviation of the average time of development becomes small (Figs. 3 and 4). These changes in the shape of the curve may be caused by differential mortality. The former case is due to the density independent mortality, which distributes randomly at all of the phases on the emergence curve, but in the latter case the mortality concentrates in the hind part of the emergence process.
日本生態学会の論文
1959-08-01