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161.
Recruitment in social insects often involves not only inducing nestmates to leave the nest, but also communicating crucial
information about finding profitable food sources. Although bumblebees transmit chemosensory information (floral scent), the
transmission mechanism is unknown as mouth-to-mouth fluid transfer (as in honeybees) does not occur. Because recruiting bumblebees
release a pheromone in the nest that triggers foraging in previously inactive workers, we tested whether this pheromone helps
workers learn currently rewarding floral odours, as found in food social learning in rats. We exposed colonies to artificial
recruitment pheromone, paired with anise scent. The pheromone did not facilitate learning of floral scent. However, we found
that releasing floral scent in the air of the colony was sufficient to trigger learning and that learning performance was
improved when the chemosensory cue was provided in the nectar in honeypots; probably because it guarantees a tighter link
between scent and reward, and possibly because gustatory cues are involved in addition to olfaction. Scent learning was maximal
when anise-scented nectar was brought into the nest by demonstrator foragers, suggesting that previously unidentified cues
provided by successful foragers play an important role in nestmates learning new floral odours. 相似文献