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Bombus terrestris  is a bumblebee with a wide geographic range, with subspecies showing a variety of local adaptations. Global export of commercially-reared  B. terrestris  started in the 1980s; the bees are a mixture of subspecies bred for ease of rearing, bivoltinism and large nests. This paper investigated whether the increase in bivoltinism in UK resident  B. terrestris audax  populations was related to introgression with imported foreign subspecies. Workers were collected from wild populations in London and Bristol, as well as two commercial suppliers. Fourteen microsatellite loci were used to study population structure, hybridisation and introgression. No introgression with commercial  B. t. dalmatinus  was detected in wild populations. Hence, the increase in winter activity appears unrelated to introgression.

Winter activity unrelated to introgression in British bumblebee Bombus terrestris audax