摘要The evolutionary transition from bee to bird pollination in plants was accompanied by multiple modifications in floral traits,such as morphology and nectar reward content(various sugars and others).Pollen presentation strategies also evolved during this transition,shifting from gradual to simultaneous pollen presentation.Pollen generally has dual functions:in addition to serving as a reward and attractant for floral visitors,it contains the male gametes that ensure the reproductive success of the plant.
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