- 著者
- TAKAHASHI HIROSHI
- 出版者
- Society for the Study of Species Biology
- 雑誌
- Plant species biology
- 巻号頁・発行日
- vol.4, no.1, pp.61-68, 1989
- 被引用文献数
- 1
The floral biology of Tricyrtis affinis was investigated and compared with that of four species of Tricyrtis which had been reported by the author. The flower opens for two days and is protandrous as in T. latifolia, T. flava, and T. ohsumiensis. The primary pollinators of T. affinis were Bombus diversus diversus and Amegilla sp., which were not different from those of the previous species although the shape and the color of the T. affinis flower are somewhat different from the others. The whole perianth of T. affinis absorbs UV light fairly well, and the large purple spotted area near the base absorbs it markedly well. The UV absorption pattern of the T. affinis flower is similar to that of T. latifolia. T. affinis is also self-compatible, like the others, and seeds obtained by self-pollination germinated well. Pollination of T. affinis is characterized by a refined system.
- 著者
- KINOSHITA EIICHIRO
- 出版者
- 種生物学会
- 雑誌
- Plant species biology (ISSN:0913557X)
- 巻号頁・発行日
- vol.2, no.1, pp.15-28, 1988-03-20
- 被引用文献数
- 8 28
A projection matrix model was adopted to describe the population dynamics of Arisaema serratum (Thunb.) Schott. This method is most appropriate for describing a complex life history, such as size-specific determination of sex expression in Arisaema. Size classification was determined from both the life history stage and the pseudostem diameter at ground level, which was transformed into natural logarithms. The calculated population growth rate based on averaged data from 1981 to 1986 was very close to unity. The survival rate was lowest at the seedling stage and gradually increased for larger size classes. But the survival rate was almost the same for the male stage and female stage irrespective of size classes. Individuals in small size classes made greater contributions to the population growth rate (λ) if they were in the asexual stage than in male or female stages. Those individuals in intermediate size classes had greater effects on λ if they were in the male phase and those in large size classes had greater effects on λ if they were in the female stage.
- 著者
- SUGAWARA,TAKASHI
- 出版者
- Society for the Study of Species Biology
- 雑誌
- Plant species biology
- 巻号頁・発行日
- vol.3, no.1, 1988-11-15
The floral biology of Heterotropa tamaensis (Makino) F. Maekawa was investigated in native populations. The flowers were protogynous, and the stigmas and anthers were distant from one another. These floral characters are significant for cross-pollination, but breeding experiments showed that the flowers are fairly self-compatible and their pollination is obligately dependent upon animal pollen vectors. The most efficient pollinator for H. tamaensis is a fungus gnat, a member of Mycetophylidae. The fungus gnat visited the flowers relatively frequently and often carried many pollen grains on their hairy bodies. Furthermore, their eggs were frequently found within flowers collected from native habitats. The fungus gnats actively moved about within the flowers and often touched the stigmas and anthers with their bodies. Therefore, H. tamaensis seems to be predominantly self-pollinated, though cross-pollination may occur rarely. The presence of fungus gnat eggs in many flowers strengthened Vogel's hypothesis that the flowers of Heterotropa species mimic the basidiomycetes, in which fungus gnats usually oviposit.