Numerous studies suggest that honeybees may compete with native pollinators where introduced as non-native insects. Here we
examine evidence for competition between honeybees and four bumblebee species in Scotland, a region that may be within the
natural range of honeybees, but where domestication greatly increases the honeybee population. We examined mean thorax widths
(a reliable measure of body size) of workers of Bombus pascuorum, B.lucorum, B.lapidarius and B.terrestris at sites with and without honeybees. Workers of all four species were significantly smaller in areas with honeybees. We suggest
that reduced worker size is likely to have implications for bumblebee colony success. These results imply that, for conservation
purposes, some restrictions should be considered with regard to placing honeybee hives in or near areas where populations
of rare bumblebee species persist.