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- Predators, which can grow up to 1.2inches long, could threaten hives
- Asian tiger mosquito, killer shrimps and Spanish slugs also a problem
- Climate change, tourism, trade and horticulture to blame for influx
By Emine Sinmaz
PUBLISHED: 20:57 EST, 20 February 2013 | UPDATED: 20:58 EST, 20 February 2013
Yellow-legged Asian hornets that prey on bees are among the latest non-native species threatening UK wildlife, and even people’s health.
A growing number of alien species, from killer shrimps to Spanish slugs, are set to soon reach our shores, a Europe-wide study warns.
The Asian hornet, which grows to between 2.5cm and 3cm (1-1.2 inches), preys on native honeybees, wasps and other pollinators, potentially devastating hives and threatening honey and crop production.
Killer: The Asian hornet can measure up to 1.2inches long and preys on honey bees. wasps and other polinators
The hornets could devastate bee hives, threatening the production of honey and crops
The report from the European Environment Agency (EEA) also warned of the spread of the Asia tiger mosquito, which is linked to more than 20 diseases including yellow fever and the dengue-like chikungunya fever.
The species is prevalent in several southern European countries, such as Italy, and is likely to expand its range north as the climate changes.
A number of alien species already in the UK are causing problems. Common ragweed, which came in to Europe from North America in bird feed is a potent trigger for hayfever and other allergies.
The Spanish slug, which reaches up to 15cm (6 inches) in length can hit garden planting and horticulture, as they eat plants as well as carrion and even each other.
Well-established invaders from across the Atlantic include the American mink which has destroyed water vole populations and the grey squirrel, from North America, which has driven its native red cousin from most of England.
More recent arrivals include killer shrimps, which feed on other aquatic wildlife and can cause local extinctions of naturally-found species and zebra mussels, thought to have arrived in ship ballasts, which can damage infrastructure such as water plants and locks.
The new list of invaders join established non-native species which have set up home in Britain such as the grey squirrel
Ring-necked, or rose-ringed, parakeets are now found across much of Britain, and there are concerns that they damage fruit crops by targeting buds and blossoms of various trees and shrubs.
They may also carry diseases which can affect humans and are often seen as a noise nuisance in urban areas because of their loud screeching calls.
Other species posing problems to the UK include brook trout, American bullfrogs, rhododendrons, Japanese knotweed, harlequin ladybirds and the horse chestnut leaf-miner moth.
Across Europe, invasive alien species cost around £10 billion a year, the EEA report said.
Species are most commonly brought in for horticulture, while other reasons they are brought in include farming, hunting and fishing or as pets. Some stow away, such as the zebra mussel and are introduced unintentionally, the study said.
Increasing tourism and trade in recent decades may have led to increasing numbers of alien invaders, while climate change may also be playing a role in the spread of species, by making areas increasingly suitable for new plants and animals.
Invading plants and animals are a major threat to already-struggling wildlife, with 110 out of the 395 European species designated as critically endangered at risk of dying out because of non-native species.
Jacqueline McGlade, EEA executive director, said: ‘In many areas, ecosystems are weakened by pollution, climate change and fragmentation.
‘Alien species invasions are a growing pressure on the natural world, which are extremely difficult to reverse.’