High-reward flowers that produce relatively high volumes of nectar are thought to be especially attractive to long-billed hermits and other hummingbird species. But when Marla A. Maglianesi and a team monitored hummingbird visits to flowering plants, including Heliconia irrasa, at Los Cusingos Bird Sanctuary and other sites in Costa Rica, they found that visit frequencies weren’t influenced by nectar traits. Rather, physical compatibility of flower corollas (collections of petals) and hummingbird bills more strongly predicted hummingbird-plant interaction patterns.
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Verbal·Information and Ideas·Inferences
hardWhich statement about hummingbird preferences is most strongly supported by the text?
A
Nectar volume was the floral trait that most strongly predicted how frequently hummingbirds visited the flowering plants at the Costa Rican sites.
B
A floral trait found to influence which plant species hummingbirds prefer may result in certain hummingbird species visiting flowers with relatively low nectar rewards over those with higher nectar rewards.
C
Physical compatibility between flower corollas and hummingbird bills becomes an important factor that influences hummingbird preferences when hummingbirds are uncertain about which plants produce high-reward nectar.
D
Hummingbirds consistently prefer plant species whose flowers have physical traits that are compatible with their bills but offer relatively low nectar rewards.