But there is now another major threat to bees’ survival in Europe: killer hornets.
The find represents the northernmost range of this invasive species so far in Europe and indicates it is spreading further north.
The Asian hornet is known to prey on many insects, including honeybees and other beneficiary species, has already invaded some parts of southern and central Europe, and is regarded as a potential threat to apiculture and even to ecosystems, scientists said.
Bees are vital pollinators for fruit, vegetables and non-domesticated plants. It is estimated that a third of all the food that we eat depends on pollination mainly by bees.
“Invasive species represent one of the big challenges in a globalised world as they more easily reach new habitats, may change local diversity patterns and often pose threats to native species and economy,” the authors said.
The Asian hornet specimen found in Europe was recorded in south-western France in 2005 and the species started to spread quickly. Over the next few years, it invaded large parts of France and regions of Spain, Portugal, Belgium, Italy, the Netherlands, southern parts of Great Britain and south-western areas in Germany.
The estimated invasion speed for France was estimated at around 78 km/year, but in reality, the spread might be occurring much faster due to human factors.
The research team said it is not yet clear if the collected Asian hornet belonged to an already settled population or if it’s the first record of a new invasion.
“Considering the fast invasion speed of the species and its relatively high climatic tolerance, it’s quite possible that it had reached Hamburg on natural routes and now reproduces there,” the scientists said.
Even though other models suggest the Hamburg area is not suitable for the species today, the new find might be a sign the Asian hornet has begun spreading at a speed above that previously known and even in climatically less favourable regions.
“The current find needs to be taken seriously, no matter if it is only a single specimen or a member of an established population”, said lead researcher Martin Husemann of the University of Hamburg.
Insects are in crisis around the world. More than 40 per cent of insect species are declining and a third are endangered.
Their loss threatens a “catastrophic collapse of nature’s ecosystems”, according to a major international study published last year.
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