Harmful or healthy? Studying how chemicals in nectar and pollen affect bees
Can diseased bees take advantage of antimicrobial chemicals found in plant nectar and pollen and self-medicate?
There is strong evidence of wild pollinator declines in the UK and around the world, with potentially severe impacts on agricultural productivity and ecosystem function, and ultimately, on human health and welfare.
Both man-made and natural pressures impact pollinator health, abundance, and diversity.
These pressures include loss of habitat, pesticide application, and parasites amongst others.
Understanding these factors is increasingly urgent, given the recent emergence of new parasites and diseases in wild and managed pollinators.
Emergent diseases are believed to be behind rapid and dramatic declines in managed honeybees and wild bumblebee populations in North and South America.
Recent work in the UK has shown that honeybee diseases are rapidly emerging in wild bumblebee populations, with potentially devastating implications.
Plant chemicals serve as a defence mechanism to reduce herbivore damage and plant pathogens but can also be stored and used by herbivores to reduce parasitism or control predators.
These plant-produced compounds are also present in nectar and pollen, the food of adult and larval bees, but are relatively poorly studied in terms of their effects on pollinators.
This project is revealing important antimicrobial effects of nectar metabolites against pathogens and parasites of bees and helping to highlight benefits of floral landscapes for pollinator health rather than simply as food for pollinators.
- Background data on the chemical compounds of pollen and nectar in UK plants.
- Recommendations of plant species that can promote pollinator health in agricultural and urban environments in the UK.
McArt, S. H., Koch, H., Irwin, R. E. & Adler, L. S. (2014)
Ecology Letters 17: 624-636
Koch, H., Abrol, D. P., Li, J. & Schmid-Hempel, P. (2013)
Molecular Ecology 22: 2028-2044
Koch, H. & Schmid-Hempel, P. (2012)
Gut microbiota instead of host genotype drive the specificity in the interaction of a natural host-parasite system.
Ecology Letters 15: 1095-1103
Arnold, S. E. J., Peralta Idrovo, M. E., Lomas Arias, L. J., Belmain, S. R. & Stevenson, P. C. (2014)
Journal of Chemical Ecology 40(8): 878-881
Tiedeken, E-J., Egan, P. A., Stevenson, P. C., Wright, G. A., Brown, M. J. F., Power, E. F., Farrell, I., Matthews, S. M. & Stout, J. C. (2015)
Functional Ecology (online) DOI: 10.1111/1365-2435.12588