コメツキガニの生態I. : 個体群構造の季節的変化について

概要

論文の詳細を見る
Monthly or seasonal investigations on the population of Scopimera globosa were carried out from 1971 to 1972 at two separate observation stations in Amakusa, Kyushu. The population density, the distribution of the carapace length and the appearance of megalopae and young crabs were examined at both stations, then the differences between the two populations were observed. The growth rate of the adult crabs differs much by sex during the reproductive period, the male grew more rapidly than the female. The settlement of megalopae began at the end of July and continued to the middle of October. The growth of some young crabs was so fast that they exceeded some of the adults in size within several months. The crab has no strong predator, and it seems probable that the main cause of death of Scopimera globosa in nature is the results of deterioration of the environmental conditions. Where the population density was high, there appeared the group of wandering individuals.
日本生態学会の論文
1974-09-30