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REPLACEMENT OF BOMBUS MUSCORUM BY BOMBUS PASCUORUM IN NORTHERN BRITAIN

  • C.M.S. Plowright (a1), R.C. Plowright (a2) and Paul H. Williams (a3)
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.

Des specimens de bourdons recueillis lors de quatre voyages (1977, 1978, 1988 et 1994) dans le nord de la Grande Bretagne démontrent, semblerait-il, des changements dans l’occurrence de deux espèces. Jusqu’à 1988 Bombus muscorum (Linnaeus) et Bombus pascuorum (Scopoli) étaient retrouvées dans les comtés de Cumbria, Durham et North Yorkshire. En 1978, seul B. muscorum était retrouvé sur les isles Orkades. En 1994, B. pascuorum fut retrouvé abondamment dans toutes ces régions, et sur les isles Orkades nous n’avons trouvé qu’un seul individu de B. muscorum. Ces données suggèrent que B. muscorum est en voie d’être remplacé par B. pascuorum dans quelques regions du nord de la Grande Bretagne.

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References
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Alford, D.V. 1975. Bumblebees. Davis-Poynter, London.
International Bee Research Association. 1980. Atlas of the Bumblebees of the British Isles. ITE Publications 30.
Plowright, R.C. 1967. On the distribution of bumblebees in Norfolk. Transactions of the Norfolk and Norwich Naturalists' Society 21: 4888.
Prŷs-Jones, O.E., and Corbet, S.A. 1991. Bumblebees. Naturalist' Handbooks 6. 2nd ed. Richmond Publishing Co. Ltd., Slough, England.
Richards, O.W. 1935. Bombus muscorum (Linnaeus) and B. smithianus White (Hym.). Transactions of the Society for British Entomology 2: 7385.
Williams, P.H. 1982. The distribution and decline of British bumblebees. Journal of Apicultural Research 21: 236245.
Williams, P.H. 1989. Bumble Bees and their Decline in Britain. Central Association of Beekeepers, Ilford, England.
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The Canadian Entomologist
  • ISSN: 0008-347X
  • EISSN: 1918-3240
  • URL: /core/journals/canadian-entomologist
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