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Fruit set in Styrax obassia (Styracaceae): the effect of light availability, display size, and local floral density¹

²Department of Forest Science, Faculty of Agriculture, Hokkaido University, Kita-ku, Sapporo 060–8589, Japan; and ³Tomakomai Research Station, Hokkaido University Forests, Tomakomai 053–0035, Japan

Maternal reproductive success was examined in Styrax obassia (Styracaceae), a bumble-bee pollinated mass-flowering tree in a cool-temperate deciduous forest in northern Japan. The effects of flower number on the success of individual flowers at three levels (inflorescence, individual, and population) were considered. During 1995 and 1996, variations in size, light availability to branches, floral display size, and fruit set were monitored in 37 out of 211 individual S. obassia trees in a 4-ha forest plot. In addition, the locations of the 211 trees in this plot were mapped and the number of inflorescences in each tree was counted. A multiple regression analysis showed that flower number per inflorescence and inflorescence number per individual had negative effects on fruit set, and inflorescence number of aggregated clumps of flowering trees, tree size, and light resource had positive effects on fruit set although significant level were marginal. It is concluded that pollinator attraction may occur not at the individual tree level, but at the level of a clump of flowering trees. It is also suggested that geitonogamy increased with inflorescence number of tree and inflorescence size and that resource limitation was related to the light condition and variation of tree size.

Key Words: bumble bee • display size • fruit set • geitonogamy • masting • size-structured population • spatial distribution • Styracaceae • Styrax obassia.

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