The bumblebee Bombus hortorum is the main pollinating visitor to Digitalis purpurea (Common Foxglove) in a U.K. population

Arthur Broadbent; Andrew Bourke

doi:10.26786/1920-7603(2012)10

Authors

Arthur Broadbent University of East Anglia
Andrew Bourke University of East Anglia

DOI:

https://doi.org/10.26786/1920-7603(2012)10

Abstract

Specialization in plant-pollinator systems represents an important issue for both the ecological understanding and conservation of these systems. We investigated the extent to which the bumblebee Bombus hortorum (Linnaeus) is the main potential pollinator of Common Foxglove, Digitalis purpurea L. Twenty D. purpurea patches were selected in North Yorkshire, U.K., ten each in woodland and garden or park habitat. All insects visiting D. purpurea within the patches were recorded over seventy 30-min bouts. The relative frequency of insect visitors to other flowering plant species within 15 m of each patch was also determined. B. hortorum and B. pascuorum were the two most frequent visitors to D. purpurea, accounting for 82 - 92% and 3 -17%, respectively, of all insect visits (n = 1682), depending on habitat. B. hortorum showed a significant preference for visiting D. purpurea relative to its frequency of visits to other available plant species. The relationship of D. purpurea with B. hortorum, which pollinates several plant species with long corollas, therefore represents a potential case of asymmetric specialization, albeit one that may vary spatially. Because D. purpurea reproduction appears dependent on insect pollination, B. hortorum and B. pascuorum may help underpin the viability of D. purpurea populations.

Author Biographies

Arthur Broadbent, University of East Anglia

School of Environmental Sciences

Andrew Bourke, University of East Anglia

School of Biological Sciences

References

Benton T (2006) Bumblebees. Collins, London.

Best LS, Bierzychudek P (1982) Pollinator foraging on Foxglove (Digitalis purpurea): a test of a new model. Evolution 36:70-79. DOI: https://doi.org/10.1111/j.1558-5646.1982.tb05011.x

Blamey M, Grey-Wilson C (1989) The illustrated flora of Britain and Northern Europe. Hodder & Stoughton, London.

Bommarco R, Lundin O, Smith HG, Rundlöf M (2012) Drastic historic shifts in bumble-bee community composition in Sweden. Proceedings of the Royal Society B 279:309-315. DOI: https://doi.org/10.1098/rspb.2011.0647

Brian AD (1951) The pollen collected by bumble-bees. Journal of Animal Ecology 20:191-194. DOI: https://doi.org/10.2307/1538

Brian AD (1957) Differences in the flowers visited by four species of bumblebee and their causes. Journal of Animal Ecology 26:71-98. DOI: https://doi.org/10.2307/1782

Edwards M, Jenner M (2005) Field guide to the bumblebees of Great Britain and Ireland. Ocelli Limited.

Fussell M, Corbet SA (1993) Bumblebee (Hym., Apidae) forage plants in the United Kingdom. Entomologist's Monthly Magazine 129:1-14.

Goulson D (2010) Bumblebees: behaviour, ecology, and conservation, 2nd edn. Oxford University Press, Oxford. DOI: https://doi.org/10.1093/oso/9780199553068.001.0001

Goulson D, Kaden JC, Lepais O, Lye GC, Darvill B (2011) Population structure, dispersal and colonization history of the garden bumblebee Bombus hortorum in the Western Isles of Scotland. Conservation Genetics 12:867-879. DOI: https://doi.org/10.1007/s10592-011-0190-4

Grindeland JM, Sletvold N, Ims RA (2005) Effects of floral display size and plant density on pollinator visitation rate in a natural population of Digitalis purpurea. Functional Ecology 19:383-390. DOI: https://doi.org/10.1111/j.1365-2435.2005.00988.x

Hill MO, Preston CD, Roy DB (2004) PLANTATT: attributes of British and Irish plants: status, size, life history, geography and habitats. Centre for Ecology and Hydrology, Huntingdon.

Kleijn D, Raemakers I (2008) A retrospective analysis of pollen host plant use by stable and declining bumble bee species. Ecology 89:1811-1823. DOI: https://doi.org/10.1890/07-1275.1

Memmott J, Waser NM, Price MV (2004) Tolerance of pollination networks to species extinctions. Proceedings of the Royal Society B 271:2605-2611. DOI: https://doi.org/10.1098/rspb.2004.2909

Nazir R, Reshi Z, Wafai BA (2008) Reproductive ecology of medicinally important Kashmir Himalayan species of Digitalis L. Plant Species Biology 23:59-70. DOI: https://doi.org/10.1111/j.1442-1984.2008.00214.x

Ollerton J, Johnson SD, Hingston AB (2006) Geographical variation in diversity and specificity of pollination systems. In: Waser NM, Ollerton J (eds) Plant-pollinator interactions: from specialization to generalization. University of Chicago Press, Chicago, pp 283-308.

Ollerton J, Alarcón R, Waser NM, Price MV, Watts S, Cranmer L, Hingston A, Peter CI, Rotenberry J (2009) A global test of the pollination syndrome hypothesis. Annals of Botany 103:1471-1480. DOI: https://doi.org/10.1093/aob/mcp031

Percival M, Morgan P (1965) Observations on the floral biology of Digitalis species. New Phytologist 64:1-22. DOI: https://doi.org/10.1111/j.1469-8137.1965.tb05370.x

Proctor M, Yeo P, Lack A (1996) The natural history of pollination. HarperCollins, London.

Prys-Jones OE, Corbet SA (1991) Bumblebees, 2nd edn. Richmond Publishing Co. Ltd, Slough.

Vázquez DP, Aizen MA (2004) Asymmetric specialization: a pervasive feature of plant-pollinator interactions. Ecology 85:1251-1257. DOI: https://doi.org/10.1890/03-3112

Waser NM, Ollerton J, eds (2006) Plant-pollinator interactions: from specialization to generalization. University of Chicago Press, Chicago.