戦後のとから列島における人口減少と人口構造の変化

概要

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On the Tokara Islands, located south-west of the Kyushu Island and consisted of nine islands, there has been a sharp decrease in the size of population after the World War II. The changing pattern in the decrease differs by islands, and the author intended to get the ecological understanding of the phenomenon. The data used were the resident-registration cards in the office of Jutto-Son, which is an administrative unit covering the Tokara Islands, and the information obtained from field surveys on the islands. The decrease to half from 1955 to 1970 is clearly due to the emigration and the drop of fertility, but the process of emigration differed by islands. We could classify the different process into three tvoes: (1) Simultaneous decrease in the number of inhabitants and of households: Nakanoshima, Suwanosejima and Kodakarajima. (2) Succesive decrease, i. e., the decrease in the number of households after that of population size: Takarajima. (3) Limp-decrease, i. e., only the size of population had shown the decrease and the number of households had stayed almost constant or shown a slight decrease: Kuchinoshima, Tairajima and Akusekijima. This type may shift to the Type 2 in the future. The difference of the changing pattern was discussed in connection with the impact of economic change, the social structure and the size of population.
日本民族衛生学会の論文