三重県のイイタカムシトリスミレ（新変種）の群落維持機構
1997 年 72 巻 4 号 p. 229-237
詳細
1997 年 72 巻 4 号 p. 229-237
To obtain basic data for the conservation of a rare new variety of Pinguicula vulgaris (Lentibulariaceae) found in Dai-Kho Mts. in Mie Prefecture, central Japan, we observed the structure and regeneration of its communities. Results are as follows: (1) The plants grew on the rocky wall of alternate layer of slate, sandstone, chart and limestone. (2) Distributional pattern of the plants was contiguous. The safe site for the plant is confined to the joints formed on the slate. (3) Stage structure of the communities examined by frequency distribution of leaf number per rossette within a population showed that there is a continual and a exponential decrease of seedling by age, but the recruitment is satisfactory. (4) The calculated half-lives of these communities suggested that the population size might have decreased to about 1/8 or 1/32 of the seedling settled or to much lower level, until they reached the flowering stage. (5) These results suggested that the communities are sustainable. However, the removal of adult stocks by natural diturbance or by human activities will accelerate their degeneration. (6) We named this plant Pinguicula vulgaris var. floribunda (var. nov.), because it differs from the mother species in some characteristics in flowers and leaves.
