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Alien honeybees fight with domestic and could cause plant extinction

Staff Writer |
New research indicates that introduced 'alien' honeybees are competing for resources with native bees and threatening the survival of plants that rely on interactions with specific pollinators.

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The study, published in the journal Diversity and Distributions, was led by Dr Olivia Norfolk of Anglia Ruskin University, who carried out the work alongside academics from the University of Nottingham.

The scientists monitored the interactions between plants and their pollinators in the mountainous region of St Katherine Protectorate in South Sinai, Egypt.

The region supports many range-restricted endemic plants and pollinators whose future may be jeopardised by the recent introduction of alien honeybees.

The mountains are characterised by the presence of Bedouin orchard gardens which act as hotspots for biodiversity, providing valuable habitat for wild plants, pollinators and migratory birds.

These gardens form the basis of traditional Bedouin livelihoods, but recently managed honeybee hives have been introduced to supplement their income.

The study found that introduced honeybees were extremely generalised in their foraging behaviour, visiting 55% of available plant species. However they made few visits to range-restricted plants and showed high levels of resource-overlap with range-restricted bees.

In this arid resource-limited environment, the presence of high numbers of super-generalist honeybees may pose a competitive threat to native bees, particularly in periods of drought.

A previous study in California showed that high numbers of feral honeybees reduced bumblebee populations through intensified competition over floral resources.

The research also found that the range-restricted plants were significantly more specialised than wider-ranged counterparts. These plants showed a much higher dependence on range-restricted pollinators and received very few visits from the introduced honeybee.

The effects of floral competition, where honeybees out-compete more efficient native pollinators, could lead to a drop in native bee visitation and a subsequent decrease in their reproductive success.


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