Migration and Dispersal after Hibernation in the Rice Leaf Beetle, Oulema oryzae KUWAYAMA (Coleoptera : Chrysomelidae)

概要

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The adult movement from overwintering sites to paddy fields and the subsequent dispersal of the rice leaf beetle, Oulema oryzae, was studied. As the ovarian development after the resumption of feeding was very rapid, the occurrence of immigration into paddy fields could be assessed by the daily change in the density of immature females, which fluctuated in parallel with the daily maximum temperature. It was inferred, therefore, that the immigration was triggered by high temperature. The variation in time of immigration from year to year could also be explained by temperature. The dispersal after immigration was favored by warm and calm weather, and the absence of females also promoted the movement of males. The timing of migratory movement after hibernation seems to be adapted to the food supply in the original habitat conditions, and the temporal relationship between the movement to paddy fields in the spring and the planting of rice would have a great impact on the population dynamics of this insect.
日本応用動物昆虫学会の論文
1983-05-25