Evolutionary convergence on hummingbird pollination in Neotropical Costus provide insight into the causes of pollinator shifts

Kathleen Kay & Dena Grossenbacher
1. The evolution of hummingbird pollination is common across angiosperm lineages throughout the Americas, presenting an opportunity to examine convergence in both traits and environments to better understand how complex phenotypes arise. We examine multiple independent shifts from bee to hummingbird pollination in the Neotropical spiral gingers (Costus) and use our data to address several common explanations for the prevalence of bee to bird pollination transitions. 2. We use floral traits of species with observed...
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