Do larger pollinators have higher pollination efficiency for a generalist plant Hibiscus mutabilis?

Introduced plants that rely on animal pollination are prone to pollen limitation due to the lack of native pollinators. However, introduced plants did not suffer from more severe pollen limitation than native plants. Here, we investigated the typical introduced plant Hibiscus mutabilis , observed, measured, and recorded the flowering dynamics, floral traits, and visiting insects, and compared the body size, visitation rate, and pollination efficiency of five pollinator species. Our observations revealed that H. mutabilis may mainly depend on the moth for its pollination in the original habitat. Macroglossum pyrrhosticta provides pollination services for H. mutabilis in the introduced area, its pollination efficiency is low due to its small pollination site. H. mutabilis can continuously secrete a large amount of nectar to attract four species of bee pollinators, and the pollination efficiency of bee pollinators is significantly related to their body size.