REPLACEMENT OF BOMBUS MUSCORUM BY BOMBUS PASCUORUM IN NORTHERN BRITAIN

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Abstract
Records of bumble bees from four collecting trips (1977, 1978, 1988, and 1994) in northern Britain show apparent changes in the incidences of two species. Until 1988, Bombus muscorum (Linnaeus) and Bombus pascuorum (Scopoli) were found in the counties of Cumbria, Durham, and North Yorkshire. Only B. muscorum was found in the Orkney Islands in 1978. In 1994, however, B. pascuorum was found abundantly in all of these areas, and in the Orkney Islands we could find only a single B. muscorum. From these data, B. pascuorum appears to have been replacing B. muscorum in some parts of northern Britain.

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