Sustainable Use and Conservation of Biodiversity
Movement of pollinators between coﬂ owering plant species may inﬂ uence conspeciﬁ c pollen deposition and seed set. Interspe- ciﬁ c pollinator movements between native and showy invasive plants may be particularly detrimental to the pollination and repro- ductive success of native species. We explored the effects of invasive Lythrum salicaria on the reproductive success of Mimulus ringens , a wetland plant native to eastern North America. Pollinator ﬂ ights between these species signiﬁ cantly reduced the amount of conspeciﬁ c pollen deposited on Mimulus stigmas and the number of seeds in Mimulus fruits, suggesting that pollen loss is an important mechanism of competition for pollination. Although pollen loss is often attributed to pollen wastage on heterospeciﬁ c ﬂ oral structures, our novel ﬁ ndings suggest that grooming by bees as they forage on a competitor may also signiﬁ cantly reduce outcross pollen export and seed set in Mimulus ringens .
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