부산대학교 도서관

Callianthemum miyabeanum is a rare and endemic species growing on Mt. Apoi in Hokkaido, northern Japan. Size structures of Callianthemum miyabeanum were compared in five populations, and size-class transition based on basal-leaf number and flowering behavior of individual plants was monitored in a population during a four-year period to estimate the population dynamics. The proportion of juvenile plants having one or two leaves was about 90% in four of the populations, and the number of flowering plants was very small in every population. New recruitment was only 5% of all individuals, including revival individuals after one or two year's dormancy. About 60% of juvenile individuals remained at the same class in the following year, and 18% showed a decrease in size class. Plants that bloomed once within the monitored plots did not bloom again during the monitoring period. These results suggest that growth of this species is restricted by resources. Survival rate was high (88% on average) and increased with size class. Populations of this species were considered to be maintained by low mortality, despite the low recruitment.