Bumblebee Ecology and Evolutionary Genetics

Bumblebees (genus Bombus) are keystone pollinators in both natural and agricultural ecosystems, underpinning biodiversity and crop yields. Their complex life cycles combine solitary queen founding with eusocial colony development, offering unique insights into social evolution and behavioural ecology. Ecologically, bumblebees exhibit niche partitioning in floral resource use, phenology and thermal tolerance, contributing to plant–pollinator network stability. From an evolutionary genetics perspective, genome‐wide analyses reveal how gene flow, genetic drift and selection shape population structure, local adaptation and species divergence. Comparative phylogenomic studies identify conserved karyotypes alongside chromosomal rearrangements in parasitic lineages, and highlight rapidly evolving gene families linked to foraging, immunity and high-altitude survival. Contemporary threats—including habitat loss, pathogens and climate change—interact with genetic factors such as reduced effective population size and introgression from commercial strains, emphasising the need for integrated ecological and genomic approaches to conservation management.

Research from Nature Portfolio

Recent investigations into hybridisation dynamics demonstrate cross-mating between the commercial bumblebee Bombus terrestris and two native Japanese species. Chemical analyses of male sex pheromones reveal cross-activity that disrupts species-specific mating signals, while DNA assays confirm hybrid individuals in the field. These findings underscore the risk to endemic bumblebee diversity posed by non-native introductions and support immediate implementation of measures to prevent genetic swamping and preserve native population integrity.

Research from all publishers

Genome-wide comparisons between wild and commercial B. terrestris populations show limited but detectable introgression near pollination farms. Regions of admixture include loci associated with taste receptors, oxidoreductase activity and lipid metabolism, indicating potential impacts on locally adapted traits despite low overall gene flow. A genus-wide sequencing effort across 17 Bombus species provides the first comprehensive picture of genomic variation underlying ecological and behavioural traits. Stable 18-chromosome karyotypes contrast with rearranged genomes in social parasites, and transposable element dynamics explain genome size differences. Rapidly evolving gene families link to foraging preferences, immunity and altitude adaptation. Conservation genomics of the declining North American Bombus terricola reveals high inbreeding coefficients and long runs of homozygosity, signalling reduced effective population size. Signatures of recent positive selection in immune-related genes align with pathogen-spillover hypotheses for species decline.

Bumblebee Ecology and Evolutionary Genetics publication trend

The graph below shows the total number of articles in bumblebee ecology and evolutionary genetics across all publications each year (not limited to Nature Index journals).

Technical terms

Eusociality: A social system in which individuals of the same species cooperate in brood care, with reproductive division of labour between fertile queens and sterile workers.

Introgression: The incorporation of genetic material from one population or species into another through hybridisation and backcrossing.

Phylogenomics: The study of evolutionary relationships using genome-scale data to reconstruct species trees and estimate divergence times.

Genetic drift: Random fluctuations in allele frequencies within a population, particularly influential in small or isolated populations.

Local adaptation: The process by which populations evolve traits that confer higher fitness in their specific environmental conditions.

References

1. Cross-mating between the alien bumblebee Bombus terrestris and two native Japanese bumblebees, B. hypocrita sapporensis and B. cryptarum florilegus, in the Nemuro Peninsula, Japan. Scientific Reports (2023).
2. Limited introgression from non‐native commercial strains and signatures of adaptation in the key pollinator Bombus terrestris. Molecular Ecology (2023).
3. Genus-Wide Characterization of Bumblebee Genomes Provides Insights into Their Evolution and Variation in Ecological and Behavioral Traits. Molecular Biology and Evolution (2020).
4. Conservation Genomics of the Declining North American Bumblebee Bombus terricola Reveals Inbreeding and Selection on Immune Genes. Frontiers in Genetics (2018).
5. Niche partitioning in a sympatric cryptic species complex. Ecology and Evolution (2016).