Honeybees often win encounters with other flower visitors, study finds
The story at a glance
Researchers observed flower visitors at five sites in and around Cambridge over two years, recording interactions on bramble and ivy. Their study focused on encounters at flower patches, rather than measuring changes in pollinator populations.13
Honeybees won more than half of the recorded encounters on both plants. Higher honeybee density was also associated with fewer non-honeybee visitors, though the pattern varied between bramble and ivy.13
The story in brief
What you need to know
- The researchers recorded direct competition for floral resources. Other visitors sometimes avoided honeybees, while displacement or chasing accounted for at least one in five outcomes in which honeybees won. The study records behaviour, but does not establish that honeybees acted with a particular intention.14
- Avoidance was recorded in 28.4% of interactions on bramble and 35.6% on ivy. These figures describe the observed encounters, not the proportion of all wild pollinators affected.134
- The association between honeybee density and fewer other visitors differed by plant: on bramble it was linked particularly to fewer bumblebees, and on ivy to fewer solitary bees and hoverflies.134
- Competitive interactions were more frequent at higher temperatures. The researchers proposed that heat stress might reduce nectar and concentrate competition, but their observations did not establish this as the cause.134
- The findings concern visitors at two types of flowering plant in one part of Cambridgeshire. The authors caution that flower-visitor observations may not measure abundance as effectively as methods such as pan trapping.1
Conservation context
Why this matters
The observations document one way honeybees and wild pollinators can compete at shared flowers. They may be relevant to pollinator management, but do not show that honeybees are causing wider declines or establish the population-level consequences of these encounters.134
The developing story
What happens next
The study does not report a tested management response. Further research would need to establish whether the patterns hold at other sites, plants and hive densities, and whether competition affects wild-pollinator survival, reproduction or population trends.1
Established evidence
What we know
Open questions
What we don't know
- It is not established whether the observed patterns occur at other UK sites, on other flowering plants or under different hive densities.1
- The study did not determine whether repeated loss of access to flowers changes wild-pollinator survival, reproduction or population trends.1
- Whether changing hive density or flower availability would alter the interactions remains untested in the reported research.1
- The cause of the temperature association is unresolved; the suggested link with heat stress and nectar was not demonstrated.134
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