Optimal Reproductive Strategy of Plants, with Special Reference to the Modes of Reproductive Resource Allocation
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概要
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A growth model for reproductive energy allocation pattern and schedule is proposed. Assumptions are as follows : (1) the assimilation rate for an individual is given by a logistic curve of vegetative dry weight ; (2) size variability is expressed by the parameter W of the logistic curve (asymptotic value of vegetative dry weight) ; (3) a plant controls allocation of the assimilate to vegetative and reproductive structures so as to maximize the reproductive energy investment at the end of the growth period. The models were analyzed in comparison with field and experimental observations and gave reasonable explanations for the reproductive allocation pattern of individuals which reflects ecological preferences and life history characteristics, such as environmental conditions of habitats (stable or changing), length of life span (annual, biennial or perennial) and growth form (erectophile or planophile). Decreasing RA (reproductive allocation) with individual size and delayed switchover time from vegetative to reproductive growth were found in plants which occur in stable environments and have a more or less fixed growth period; in those which occur in changing environments where growth period depends on individual size, RAs that remain constant or increase with variations in individual size and early switchover time were detected. Most perennials conform to the former case, but annuals and biennials conform to the latter case. Under extremely overcrowded conditions, planophiles, which are much more subject to crowding effect than erectophiles, tend to have increasing RA with increasing size, while erectophiles tend to have almost constant RA irrespective of size. These trends are discussed in the light of the life history characteristics and ecological distribution of plant species studied.
- 種生物学会の論文
- 1988-11-15
著者
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KAWANO Shoichi
Department of Botany, Graduate School of Sience, Kyoto University
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Nagai Yukio
Toyama Senior High School
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Kawano Shoichi
Department Of Botany Graduate School Of Science Kyoto University
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HARA TOSHIHIKO
Laboratory for Plant Ecological Studies, Faculty of Science, Kyoto University
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Hara Toshihiko
Laboratory For Plant Ecological Studies Faculty Of Science Kyoto University:(present Address)departm
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Kawano Shoichi
Department Of Applied Physics Faculty Of Engineering Tohoku University
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Kawano Shoichi
Department Of Botany Faculty Of Science Kyoto University:institute Of Genetic Ecology Tohoku Univers
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