An Application of the Sex Allocation Theory to Arisaema serratum(<SPECIAL ISSUE>US-JAPAN SEMINAR : EVOLUTIONARY STUDIES ON SEXUAL SYSTEMS IN PLANTS)

概要

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The sex allocation theory based on size-specific demography is applied to sex change phenomena exhibited by Arisaema serratum, which changes sex expression according to its size. In the evolutionary analysis where adopted strategy correlates with resource level, identifying equal resource level is very important. But directly measured size does not seem to represent the plant's real resource level perfectly. In the analysis presented here, we introduce a new variable that represents the resource level. According to the sex allocation theory, we calculated the transition matrix and other demographic parameters, the stable sex-and-size distribution, and reproductive values. The obtained results were : (1) reproductive values generally increased in accordance with size, but in a different manner for different sexes ; (2) in the size class where different sex expressions were adopted, reproductive values for the equal resources were the same ; and (3) plant individuals seemed to adopt evolutionarily stable strategies. The adaptive nature of the plant is further discussed.
1990-09-30