Sex Change and Population Dynamics in <i>Arisaema</i> (Araceae) I. <i>Arisaema serratum</i> (Thunb.) Schott<sup>1)</sup>

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  • Sex Change and Population Dynamics in Arisaema (Araceae) : I. Arisaema serratum (Thunb.) Schott(SYMPOSIUM : LIFE HISTORY AND EVOLUTION IN ARISAEMA) :

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<jats:p><jats:bold>Abstract</jats:bold> A projection matrix model was adopted to describe the population dynamics of <jats:italic>Arisaema serratum</jats:italic> (Thunb.) Schott. This method is most appropriate for describing a complex life history, such as size‐specific determination of sex expression in <jats:italic>Arisaema</jats:italic>. Size classification was determined from both the life history stage and the pseudostem diameter at ground level, which was transformed into natural logarithms.</jats:p><jats:p>The calculated population growth rate based on averaged data from 1981 to 1986 was very close to unity. The survival rate was lowest at the seedling stage and gradually increased for larger size classes. But the survival rate was almost the same for the male stage and female stage irrespective of size classes.</jats:p><jats:p>Individuals in small size classes made greater contributions to the population growth rate (λ) if they were in the asexual stage than in male or female stages. Those individuals in intermediate size classes had greater effects on λ if they were in the male phase and those in large size classes had greater effects on λ if they were in the female stage.</jats:p>

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