A new study reported this week by evolutionary ecologist Lynn Adler at the University of Massachusetts Amherst and Rebecca Irwin of North Carolina State University, with others, suggests that flower strips – rows of pollinator-friendly flowers planted with crops – offer benefits for common Eastern bumblebee (Bombus impatiens) colony reproduction, but some plants do increase pathogen infection risk.
A new study reported this week by evolutionary ecologist Lynn Adler at the University of Massachusetts Amherst and Rebecca Irwin of North Carolina State University, with others, suggests that flower strips – rows of pollinator-friendly flowers planted with crops – offer benefits for common Eastern bumblebee (Bombus impatiens) colony reproduction, but some plants do increase pathogen infection risk.
As Adler and colleagues point out, pollinator declines affect food security, and pollinators are threatened by such stressors as pathogens and inadequate food. Bumblebees feed on pollen and nectar they gather from such plants as sunflower and milkweed. But bumblebees are also likely to acquire a gut disease pathogen, Crithia bombi, from some of these plant species more than others, the authors note.
Until now, the effect of plant species composition on bee disease was unknown, they add. Study details appear in Proceedings of the National Academy of Sciences.
In earlier work on flowers and bee infection, Adler explains, “We evaluated 15 plant species by putting the same amount of C. bombi on each, letting a bee forage, and then seeing whether and how bad an infection it developed. We used that to designate plant species as ‘high- or low-infection’ for this study.” Low-infection plants include sunflower and thyme; high-infection plants include swamp milkweed and purple loosestrife.
Read more at University of Massachusetts Amherst
Image: A new study from UMass Amherst and NC State shows that sunflowers are one of the plants that can be planted among rows of agricultural crops in flower strips -- rows of pollinator-friendly flowers -- to benefit common Eastern bumblebee (Bombus impatiens) colony reproduction with a lower gut pathogen load than some other flowers. (Credit: Ben Barnhart)
