47 0 0 0 OA 琉球列島奄美大島の絶滅危惧植物アマミヒイラギモチ(モチノキ科)の植物体サイズと葉の二型性
- 著者
- Setoguchi Hiroaki Nakagawa Masaharu Momohara Arata 瀬戸口 浩彰 中川 政治 百原 新
- 出版者
- 植物地理・分類学会 = The Society for the Study of Phytogeography and Taxonomy
- 雑誌
- 植物地理・分類研究 = The journal of phytogeography and taxonomy (ISSN:03886212)
- 巻号頁・発行日
- vol.56, no.1, pp.7-11, 2008-09-30
The tree Ilex dimorphophylla Koidz.(Aquifoliaceae)is a vulnerable species that is endemic to the summit of Mt. Yuwan on Amamioshima Island, Japan. This plant hows characteristic leaf dimorphism, which increases its horticultural value, and many individuals have been illegally removed from the natural habitat. We examined the umber of shoots, leaf morphology and plant size of the species in the natural habitat. Based on field observation for two years, we found 84 shoots, of which 32(38.1%)had entire mature leaves, whereas 52(61.9%)had only serrate juvenile leaves. Majority of the examined shoots surveyed fell into the smallest size classes : < 100 cm in eight(ca. 45%)and < 25 mm in diameter at the trunk base(ca. 60%). Leaf dimorphism was clearly demarcated in trees at 130―210 cm in height and 15―27 mm in diameter at the trunk base.
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ヒイラギの葉について奄美大島のアマミヒイラギモチを調べているものがあった。樹高130～210cm、根元の直径15～27mmを堺にトゲのある無しが分かれるそう。こうした変化は一般的に草食動物への防御と考えられているが、奄美大島では食害が無いのでなぜこうなってるかは不明と。https://t.co/migJRyAuQZ