Data from: Greater pollination generalization is not associated with reduced constraints on corolla shape in Antillean plants

Flowers show important structural variation as reproductive organs but the
evolutionary forces underlying this diversity are still poorly understood.
In animal-pollinated species, flower shape is strongly fashioned by
selection imposed by pollinators, which is expected to vary according to
guilds of effective pollinators. Using the Antillean subtribe Gesneriinae
(Gesneriaceae), we tested the hypothesis that pollination specialists
pollinated by one functional type of pollinator have maintained more
similar corolla shapes through time due to more constant and stronger
selection constraints compared to species with more generalist pollination
strategies. Using geometric morphometrics and evolutionary models, we
showed that the corolla of hummingbird specialists, bat specialists, and
species with a mixed-pollination strategy (pollinated by hummingbirds and
bats; thus a more generalist strategy) have distinct shapes and that these
shapes have evolved under evolutionary constraints. However, we did not
find support for greater disparity in corolla shape of more generalist
species. This could be because the corolla shape of more generalist
species in subtribe Gesneriinae, which has evolved multiple times, is
finely adapted to be effectively pollinated by both bats and hummingbirds.
These results suggest that ecological generalization is not necessarily
associated with relaxed selection constraints.