ウリハムシの水分および脂質含有量の季節的変化
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概要
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A leaf-beetle, Aulacophora fumolaris MOTSCHULSKY, one of the most injurious insects to the water melon and other plants belonging to Cucurbitaceae, produces only one generation in a year, and hibernates in and adult form. This report deals with seasonal variations of water and lipid contents of an adult beetle throughout the life cycle. The results obtained are as follows. 1.An adult beetle which has emerged in August increases in its body-weight within a month from ca.26 to ca.32mg. Simultaneously, it increases in its lipid content from ca.1.2 to ca.7mg., being estimated to be from ca.4 to ca.22% on the basis of body-weight. On the contrary, the water content of the beetle drops from ca.70 to ca.52%, though the absolute amount of water remains unchanged. 2.In September, the new adult beetles begin to migrate from a crop field to a place for hibernation. They are characterized by a well-developed iatbody, and by higher rate of lipid and lower rate of water to the body weight respectively just before and after migration than at any other periods. 3.At first, they flock on the back surface of the leaves of shrubs, and after a month they move to a crevice of a rock or to the base of weeds near the shrubs. We designate the two periods as the pre- and post-hibernating poriod, respectively. During the pre-hibernating period the beetle decreases in its body-weight from ca.32 to ca.30mg., and considerably in its weight of lipid from ca.7 to ca.4mg., being estimated to be from ca.23 to ca.15%. The water content of the beetle is increased from ca.51 to ca.60%, though its absolute amount shows on appreciable fluctuation. The weight of solids other than lipid is decreased a little. During the post-hibernating period the body-weight of ca.30mg. is reduced to ca.25mg. The weight of lipid is also decreased from ca.4 to ca.1.7mg. Solids other than lipid remain constant in their weight, and water content does not change much in its absolute amount. Thus, the percentage both of water and solids other than lipid rises from ca.58 to ca.64% and from ca.27 to ca.30%, respectively. The content of lipid drops from ca.15 to ca.6%. 4.In the later part of March, the beetles migrate from the place for hibernation to the crop field, where they copulate and deposite eggs. During the period of breeding, the weight of lipid is ca.1.3mg., being estimated to be ca.4%, each showing the minimum value of the whole year. The water content increases remarkably either on the basis of absolute amouat or on the basis of percentage, ranging from ca.17 to 23mg. and from ca.63 to 67%, respectively.
- 1958-06-01