Hygienic food to reduce pathogen risk to bumblebees

Graystock, P, Jones, J C, Pamminger, T, Parkinson, J F, Norman, V, Blane, E J, Rothstein, L, Wäckers, F, Goulson, D and Hughes, W O H (2016) Hygienic food to reduce pathogen risk to bumblebees. Journal of Invertebrate Pathology, 136. pp. 68-73. ISSN 0022-2011

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Abstract

Bumblebees are ecologically and economically important pollinators, and the value of bumblebees for crop pollination has led to the commercial production and exportation/importation of colonies on a global scale. Commercially produced bumblebee colonies can carry with them infectious parasites, which can both reduce the health of the colonies and spillover to wild bees, with potentially serious consequences. The presence of parasites in commercially produced bumblebee colonies is in part because colonies are reared on pollen collected from honey bees, which often contains a diversity of microbial parasites. In response to this threat, part of the industry has started to irradiate pollen used for bumblebee rearing. However, to date there is limited data published on the efficacy of this treatment. Here we examine the effect of gamma irradiation and an experimental ozone treatment on the presence and viability of parasites in honey bee pollen. While untreated pollen contained numerous viable parasites, we find that gamma irradiation reduced the viability of parasites in pollen, but did not eliminate parasites entirely. Ozone treatment appeared to be less effective than gamma irradiation, while an artificial pollen substitute was, as expected, entirely free of parasites. The results suggest that the irradiation of pollen before using it to rear bumblebee colonies is a sensible method which will help reduce the incidence of parasite infections in commercially produced bumblebee colonies, but that further optimisation, or the use of a nutritionally equivalent artificial pollen substitute, may be needed to fully eliminate this route of disease entry into factories.

Item Type: Article
Schools and Departments: School of Life Sciences > Evolution, Behaviour and Environment
Depositing User: William Hughes
Date Deposited: 31 Mar 2016 13:40
Last Modified: 07 Mar 2017 04:54
URI: http://sro.sussex.ac.uk/id/eprint/60184

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Project NameSussex Project NumberFunderFunder Ref
Development and verification of a standardised protocol for the detection of parasite infection levels in commercially-produced bumblebee coloniesG1187NERC-NATURAL ENVIRONMENT RESEARCH COUNCILNE/L002760/1