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American Zoologist 1983 23(1):99-109; doi:10.1093/icb/23.1.99
© 1983 by The Society for Integrative and Comparative Biology
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Life-History Characteristics and Colonizing Success in Plants1

HIKO-ICHI OKA
Food Crops Research Institute, National Chung Hsing University Taichung, Taiwan 400, ROC

Successful plant colonizers are characterized by the attributes of weediness but exhibit a variety of life-history traits and genetic systems. Colonizing success would depend on the ability of exploiting niches in competition with earlier inhabitants. Within-population genetic variation plays a role in adaptation to new habitats. An experiment with hybrid derivatives from a cross between wild and cultivated soybean species proved that the ability to establish seedlings in semi-natural conditions was genetically controlled, and was loosely correlated with various traits. A wild rice species, Oryza perennis, shows perennial-annual continuum among populations. The populations markedly differed in life-history traits and niche dimension, as conditioned by seasonal water regime and man's disturbance of the habitats. Intra-populational differentiation was also observed. The data suggested that various life-history traits are selected as a set.


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