Evolution of Mating Systems in Island Populations of <i>Campanula microdonta</i>: Pollinator Availability Hypothesis

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  • Evolution of Mating Systems in Island Populations of Campanula microdonta : Pollinator Availability Hypothesis(<SPECIAL ISSUE>US-JAPAN SEMINAR : EVOLUTIONARY STUDIES ON SEXUAL SYSTEMS IN PLANTS) :

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<jats:p><jats:bold>Abstract</jats:bold> Island populations of <jats:italic>Campanula microdonta</jats:italic> and mainland Honshu populations of <jats:italic>C. punctata</jats:italic> have several different mating systems: self‐incompatible (SI) and therefore obligately outcrossing in mainland Honshu and Oshima Island; self‐compatible (SC) and largely outcrossing in the northern islands of Toshima and Niijima; and SC and predominantly inbreeding southern ones of Miyake and Hachijo. Several features possibly associated with the mating systems are described. A hypothesis is proposed that the mean and variance of pollinator availability together with inbreeding depression could explain the observed patterns of mating system as the results of evolution.</jats:p>

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