Optimal Resource Allocation to Seeds and Vegetative Propagules in the Understory Herb Syneilesis palmata (Compositae)
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概要
- 論文の詳細を見る
The aim of the present study was to evaluate the fitness consequences of resource allocation balance between seeds and vegetative propagules in an understory herb, Syneilesis palmata. Based on field censuses, transition matrices were constructed to compare the fitness of hypothetical S. palmata populations with different allocation balances (from seeds alone to vegetative propagules alone). We obtained the dominant eigenvalue (λ) of each matrix, which gives the finite rate of population increase, i. e. a fitness measure for a population with overlapping generations. The value of λ was highest when the relative allocation to seeds (P) was zero and decreased as P increased, indicating that the optimal strategy was to reproduce only vegetatively. Seed reproduction was favored only under quite unrealistic situations such as production of 500-1000 times more seeds per unit investment than those observed in the real plants, or seedling growth under full sun light. The majority of fertile plants, however, produced seeds in addition to vegetative propagules in the natural habitats. The results of our simulations provide quantitative, though indirect, evidence for important roles of seeds in dispersal and/or sexual reproduction.
- 種生物学会の論文
著者
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Kachi Naoki
Global Environment Research Division National Institute For Environmental Studies
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NISHITANI Satomi
Department of Biology, Faculty Science, Tokyo Metropolitan University
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Takada T
Hokkaido Tokai Univ. Sapporo Jpn
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Takada Takenori
Department Of Biophysics Faculty Of Science Kyoto University:(present Address)school Of Internationa
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Takada Takenori
Graduate School Of Environmental Earth Science Hokkaido University
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Nishitani S
Department Of Biology Faculty Of Science Tokyo Metropolitan University
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Nishitani Satomi
Department Of Biology Faculty Of Science Shizuoka University
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