北海道のシダ植物の胞子散布時期

概要

論文の詳細を見る
Sporo-dispersal period of most Pterophyta is limited within one or two months in Hokkaido. Even in the same species, there is a tendency that the spore-dispersal period becomes shorter according to the forwarding in the northern part of Japan Archipelago. Many kinds of summer green ferns disperse spores from late July to September whereas other ferns including evergreen, semi-evergreen and winter green ones from August to early November in Hokkaido. Among sixty Pterophyta species studied in Hokkaido, about forty species them disperse spores during the limited period, from the end of August to early September. These characteristics of spore-dispersal might be caused by the restriction of growing season in the cold climates. Moreover, many kinds of ferns which disperse spores at the end or August, usually grow into young gametophytes in early winter. This also suggests that the gametophytes should live in winter as thalli and wait for the alternation of generation into sporophytes until the coming spring and summer. These phenomena are regarded as one of the adaptive strategies in the carly life history of gametophytic generation for over wintering of Pterophyta in the cold climates in Japan Archipelago.
日本生態学会の論文
1981-03-30