Social Evolution and Nesting Behavior in Bees

Bees exhibit a remarkable spectrum of social organisation, ranging from solitary nesting to full eusociality with permanent reproductive and worker castes. Solitary species construct and provision individual brood cells before sealing nests, whereas primitively eusocial taxa may display flexible helping behaviour, extended brood care and temporal division of labour without obvious morphological castes. Advanced eusocial lineages, such as honeybees and stingless bees, demonstrate rigid caste systems, overlapping generations and complex communication. Transitions toward sociality have been driven by life-history traits including voltinism and diapause strategy, ecological pressures such as resource distribution, predation and parasitism, and parental care mechanisms. Recent research highlights cryptic forms of brood monitoring, biparental investment and the role of ecological context in mediating cooperation. These insights not only deepen our understanding of major evolutionary transitions in eusocial insects but also inform conservation strategies for essential pollinators facing global environmental change.

Research from Nature Portfolio

Detailed field observations of the small carpenter bee Ceratina nigrolabiata reveal a unique form of biparental care. Pairs establish nests prior to provisioning brood cells; once the youngest offspring reach the larval stage, males typically depart while females may either remain to guard or abandon the nest. Guarded nests are provisioned more extensively and yield larger broods, whereas many nests are closed and deserted following provisioning or orphaned prematurely. This work illuminates previously unrecognised patterns of parental investment and nest‐abandonment strategies, suggesting that biparental and extended maternal care have played underappreciated roles in the evolution of social behaviour.

Research from all publishers

Studies of non-kin cooperation in carpenter bees demonstrate that severe competition for nest sites can drive the formation of social groups composed largely of unrelated individuals. In such groups, cooperation is maintained by direct fitness benefits rather than kin selection, reducing the costs of nesting competition. Separately, broad comparative analyses across Hymenoptera identify key ecological drivers—resource scarcity, climatic stress and predation pressure—that promote non-kin associations and communal nesting. Together, these findings expand the framework of social evolution by emphasising ecological constraints and direct benefits as potent forces shaping group living in bees beyond traditional kin-based models.

Social Evolution and Nesting Behavior in Bees publication trend

The graph below shows the total number of articles in social evolution and nesting behavior in bees across all publications each year (not limited to Nature Index journals).

Technical terms

Eusociality: The highest level of social organisation, defined by cooperative brood care, overlapping generations and reproductive division of labour.

Caste differentiation: The emergence of distinct reproductive and non-reproductive (worker) forms within a colony, often with specialised morphology or behaviour.

Parental care: Extended investment by adults in brood survival, including nest guarding, provisioning and hygiene.

Foundress: A solitary or primary female that initiates a nest and provisions the first brood.

Diapause: A physiological arrest of development, typically seasonal, that influences life-history timing and social evolution.

References

1. Born to be bee, fed to be worker? The caste system of a primitively eusocial insect. Frontiers in Zoology (2012).
2. Loss of developmental diapause as prerequisite for social evolution in bees. Biology Letters (2019).
3. Cryptic extended brood care in the facultatively eusocial sweat bee Megalopta genalis. Insectes Sociaux (2015).
4. Competition Drives Group Formation and Reduces Within Nest Relatedness in a Facultatively Social Carpenter Bee. Frontiers in Ecology and Evolution (2021).
5. Ecological Drivers of Non-kin Cooperation in the Hymenoptera. Frontiers in Ecology and Evolution (2022).
6. Nesting of Ceratina nigrolabiata, a biparental bee. Scientific Reports (2021).