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Published on: October 9, 2017
Effects of invasive parasites on bumble bee declines
Ivan Meeus1, Mark J F Brown, Dirk C De Graaf
1Laboratory of Agrozoology, Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium. ivan.meeus@ugent.be
Parasites spread from commercial bumble bee colonies threaten wild populations. Implementing screening and sanitation can help mitigate these risks to vital pollinators.
Area of Science:
- Ecology
- Zoology
- Conservation Biology
Background:
- Bumble bees are crucial pollinators facing global declines.
- Parasite transmission from commercial to wild populations is a suspected driver of decline.
- Commercial bee practices may increase parasite loads, virulence, and disrupt local adaptation.
Purpose of the Study:
- To assess parasite virulence, transmission, and infectivity in bumble bees.
- To identify key threats to native bumble bee populations from parasites.
- To explore potential mitigation strategies for parasite-induced declines.
Main Methods:
- Assessed parasite virulence, transmission modes, and infectivity.
- Examined the role of specific microparasites like Crithidia bombi and Nosema bombi.
- Investigated potential non-native origins of parasites in South America.
Main Results:
- High horizontal transmission probability for Crithidia bombi poses a significant threat.
- Nosema bombi may contribute to bumble bee declines in the United States.
- Evidence suggests Crithidia bombi and Apicystis bombi might not be native to parts of South America.
Conclusions:
- Microparasites and honey bee viruses represent major threats to bumble bees.
- Molecular screening, sanitation, and inter-organizational cooperation are crucial.
- Proactive measures can mitigate immediate threats to bumble bee populations.
Related Concept Videos
Microbial Interactions: Parasitism
Conservation of Declining Populations
Frequency-dependent Selection
Threats to Biodiversity
Pollination and Flower Structure

