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题目材料：
Insect pollinators often restrict their visits to flowers of the same plant species on a single foraging trip, even when flowers of other species are available. In 1876 Darwin suggested that the reason for this behavior (generally referred to as flower constancy) is that pollinators forage more efficiently if they continue foraging on flowers they have recently learned to handle. Darwin's hypothesis implies that learning additional flower-handling techniques interferes with a pollinator's ability to recall previously learned flower- handling methods. Evidence for interference in butterflies switching between flowers of two plant species seems to be conclusive. In bumblebees, laboratory experiments have also provided some evidence of interference when the bees switch between flowers of two plant species, but the small size of the interference effects suggest that foraging bumblebees experience less difficulty switching between two plant species than butterflies do. This is consistent with field
observations showing that individual bumblebees often visit two available plant species on a single trip. However, the fact that multiple specializations on more than two plant species are rarely observed in the field in bumblebees suggests that switching among several species may result in larger interference effects, which may limit the number of flower types that can be maintained in a bee's foraging repertoire at any time.
以上解析由 考满分老师提供。
