生活史特性の異なる二つのショウジョウバカマ集団の比較

概要

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Life history characteristics of an evergreen herbaceous perennial, Heloniopsis orientalis, were compared in two neighboring populations under different environments in Toyama prefecture on the Japan Sea side of central Japan. One was a population on a shady forest floor, which is the typical habitat of this species, and the other was a population on a slope along a sunken road. On the forest floor, no seedlings of H. orientalis were evident, and the population seemed to be maintained by vegetative reproduction involving plantlets formed at the tips of leaves. In the other population observed on the steep slope, most of the individuals replaced their leaves every year, and therefore plantlets could not grow. This population seemed to be maintained exclusively by sexual reproduction. Differences were also observed in the plant size of individuals possessing flower buds ; individuals of the slope population flowered at an earlier developmental stage than those of the forest floor population. This may be adaptive, since unstable and disturbed conditions on the slope could favor early maturity. The difference in reproductive behavior, i. e. vegetative reproduction on the forest floor and sexual reproduction on the slope, may also reflect the ecological differentiation observed in the two wild populations.
日本生態学会の論文