Community dynamic models of two dioecious tree species |
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Authors: | Satoshi Nanami Hideyuki Kawaguchi Takuya Kubo |
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Affiliation: | (1) Laboratory of Forest Ecology, Faculty of Agriculture, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan;(2) Faculty of Science, Kyushu University, Fukuoka 812-8581, Japan;(3) Present address: Faculty of Life and Environmental Science, Shimane University, Matsue 690-8504, Japan;(4) Present address: Division of Bioscience, Graduate School of Environmental Earth Science, Hokkaido University, Kita 10 Nishi 5, Sapporo 060-0810, Japan |
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Abstract: | The effects of dioecy on community dynamics were examined by using transition matrix models for two dioecious tree species, one a superior competitor with a narrow dispersal range and the other an inferior competitor with a wide dispersal range. The models are based on tree-by-tree replacements in each identical microsite occupied by either male or female canopy trees of the superior competitor and canopy trees of the inferior competitor. Coexistence of the two species is possible not only because of a trade-off between competitive and dispersal abilities but also because of the existence of a competitor gap, which the superior competitor cannot occupy. The competitor gap is created under the male trees of the superior competitor. The inferior competitor occupies the competitor gap because of its wide dispersal range. The relative abundance of the two species depends on the dispersal ability and sex ratios of the superior competitor. The decreasing dispersal ability and the female abundance of the superior competitor increase the competitor gap, which allows the regeneration of the inferior competitor.An erratum to this article can be found at |
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Keywords: | coexistence competition dispersal sex expression transition matrix |
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