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Kin discrimination by worker honey bees in genetically mixed groups
M D Breed1, L Butler, T M Stiller
1Department of Environmental, Population, and Organismic Biology, Campus Box 334, The University of Colorado, Boulder, CO 80309.
Summary
Honey bee workers in mixed genetic groups learn the composite identity of the group and do not attack unfamiliar bees differently based on kinship. However, bees interact more with their own sisters, indicating they use individual cues.
Area of Science:
- Behavioral Ecology
- Social Insects
- Honey Bee Genetics
Background:
- Honey bee colonies exhibit complex social structures with kin recognition crucial for colony cohesion.
- Understanding how individual honey bees (Apis mellifera) perceive and respond to genetic diversity within their colony is vital.
Purpose of the Study:
- To investigate whether individual worker honey bees differentiate their behavior towards unfamiliar sisters versus unfamiliar non-sisters within a genetically mixed group.
- To determine if honey bees learn a group identity or maintain individual kin recognition in mixed genetic contexts.
Main Methods:
- Assembling mixed genetic groups of worker honey bees from two distinct kin groups (5 bees each).
- Introducing a novel bee (from one of the kin groups) into the established mixed group.
- Observing and recording interactions between the introduced bee and the resident bees.
Main Results:
- Individual honey bees in mixed kin groups did not differentially attack unfamiliar bees based on kinship, suggesting they learned a composite group identity.
- Bees engaged in significantly more interactions with unfamiliar sisters compared to unfamiliar non-sisters.
- A trend towards increased feeding interactions with sisters was observed, indicating the use of individual cues.
Conclusions:
- Honey bees can learn the composite identity of a genetically mixed group, overriding simple kin-based discrimination in aggression.
- Individual kin recognition persists, influencing interaction frequency and potentially social behaviors like feeding, even within mixed groups.
- The findings highlight the nuanced interplay between learned group identity and innate kin recognition in shaping honey bee social behavior within genetically diverse colonies.