Honeybees learn floral odors while receiving nectar from foragers within the hive

Area of Science:

• Animal behavior
• Neuroethology
• Social insect communication

Background:

• Honeybee foragers returning to the hive can transmit learned nectar odors.
• Inside the hive, specific worker bees interact with foragers through trophallaxis (food sharing).

Purpose of the Study:

• To investigate the associative learning abilities of nectar-receiving bees within the hive.
• To determine if bees learn odor-sugar solution associations via trophallaxis.

Main Methods:

• Workers performing nectar-receiving tasks were exposed to scented or unscented sugar solutions via trophallaxis from foragers.
• Olfactory memories of these workers were tested using the proboscis extension response (PER) paradigm.
• Two observational hives were used, and specific odorants like phenylacetaldehyde (PHE) and nonanal were employed.

Main Results:

• Bees receiving scented solutions showed significantly higher response frequencies to the associated odor compared to those receiving unscented solutions.
• No significant differences were observed in response frequencies between different food odors or colony odors.
• This indicates associative learning of scent-sugar solution pairings.

Conclusions:

• First-order receiver bees in honeybee colonies learn scent-sugar associations through trophallaxis.
• This learning mechanism enhances operational cohesion and information propagation regarding floral resources.
• Learned associations may influence future honeybee preferences for specific nectar sources.