Life History Studies on the Genus Trillium (Liliaceae) : VI. Life History Characteristics of Three Western North American Species and Their Evolutionary-Ecological Implications
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概要
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Life history characteristics of three western North American Trillium species, i. e., T. ovatum (Pedicellate-group), T. albidum and T. petiolatum (both Sessile-group), were critically investigated and compared. The stage-class structure, based upon leaf area, of populations of the three species all were indicative of stable populations, even though the species occurred in contrastingly different habitat conditions. Trillium ovatum occurred in the deep shade of mesic coniferous forests on mountain ridges or slopes. Trillium albidum was found in exceedingly damp sandy-loam soils in deciduous forests developed on the lowland flood plains. Trillium petiolatum occurred on dry rocky or gravelly shrub-dominant areas. There was a gradual but conspicuous decrease in the number of individuals in the early juvenile stages, followed by similar numbers of plants in the intermediate stages and mature flowering stages. Recruitment of offspring appears to be exclusively dependent upon sexual reproduction in all three species, since none of the species formed vegetative offshoots as found in some sessile group species occurring in eastern as well as western North America. Analysis of spatial distributions within the populations of T. ovatum and T. petiolatum revealed successive changes from aggregated (juveniles) to random (intermediate stages), and overdispersed (flowering plants) distributions. The evolutionary-ecological relationships of these three species are compared with those of 27 other Trillium species.
- 種生物学会の論文
著者
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Ohara Masashi
Laboratory Of Industrial Crops Faculty Of Agriculture Hokkaido University
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KAWANO Shoichi
Department of Botany, Graduate School of Sience, Kyoto University
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Ohara Masashi
Department Of Biology Graduate School Of Arts And Sciences The University Of Tokyo
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Utech F
Carnegie Mellon Univ. Pa Usa
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Kawano Shoichi
Department Of Botany Graduate School Of Science Kyoto University
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Utech Frederick
Section Of Botany Carnegie Museum Of Natural History
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Ohara Masashi
Laboratory Of Ecology And Genetics Graduate School Of Environmental Earth Science Hokkaido Universit
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Kawano Shoichi
Department Of Botany Faculty Of Science Kyoto University
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Kawano Shoichi
Department Of Applied Physics Faculty Of Engineering Tohoku University
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