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Pollination systems, biogeography,and divergence times of three allopatric species of Schisandra in North America,China,and Japan

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Journal of Systematics and Evolution 2011年第4期49卷 330-338页

作者： Leonard B.THIEN Cell and Molecular Biology Department Tulane University

This study analyses the pollination systems and biogeography of three allopatric species of Schisandra (Section Euschisandra) consisting of *** (North America),*** (China),and *** (Japan);the clade is delimited in a phylogenetic tree of Schisandraceae constructed with nuclear and plastid *** male and female flowers of these species have similar floral structures,but exhibit different pollination *** the base of the clade,*** is pollinated by a wide variety of beetles and flies in a generalist pollination system that also includes floral heat and the use of male and female flowers as brood sites for *** Asia,however,*** and *** are pollinated exclusively by one or two different species of gall midges (resseliella spp.) in a specialist pollination *** this system only female,pollen-eating gall midges pollinate the flowers and breed on nearby *** gall midge pollination system is specialized and derived from the generalist system in ***,and basal in the *** is the main floral resource,and we hypothesize it is exploited to enrich eggs,and as a result species of gall midges could increase reproductive fitness by feeding on a single dependable food *** the life cycles of the plants and insects evolved into a tight association in old stable plant communities in the Sino-Japanese *** times for the plant species are presented and correlated with past distributions and migration routes.

关键词： biogeography Diptera phylogeny pollination resseliella Schisandra.

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