Speedy snails spread deadly disease

August 23, 2013
By
Deeter Does Wirless

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Snails

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Time-lapse footage of the snails moving

Despite their lethargic reputations, snails can travel at a relatively speedy one meter per hour, say researchers.

By attaching multicolored LED lights, the scientists were able to track their movements over a 24-hour period.

The gastropods were fast enough to explore the length of an average UK garden in a single night.

But scientists are worried that the fast moving snails are spreading a parasite that is deadly for dogs.

Over the past few years the wet summers enjoyed across the UK have proved the ideal breeding grounds for snails.

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They are not just lettuce munchers, they are carriers of parasites that can kill your dogs,”

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Dr Dave Hodgson
University of Exeter

According to the Royal Horticultural Society, their numbers increased by 50% last year.

As well as being a pest for gardeners, snails can also spread a parasite called Angiostrongylus vasorum.

This lungworm is a particular threat to dogs, which can become infected by accidentally eating slugs or snails which they come across in the garden or on dog toys.

Painted snails

To assess the scale of the threat, researchers at the University of Exeter decided to track the movements of snails in garden situations.

To do this they attached tiny, multicolored LED lights to the backs of some 450 snails and used UV paint to track their movements.

The researchers found that the snails could cover distances up to 25 meters in a 24-hour period.

wormThe lungworm parasite can be fatal in dogs and researchers say it is spreading across the UK

“They are so slow that people don’t even think about them moving, but it turns out they do, and they can go a long way in a night,” said Dr Dave Hodgson, who lead this study and was also involved in a BBC amateur science experiment in 2010 that sought to discover if snails had a homing instinct.

The researchers say their new work indicates that snails pose a growing threat to pets.

“They are not just lettuce munchers, they are carriers of parasites that can kill your dogs,” said Dr Hodgson,

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A recent survey of veterinary surgeons indicated that the lungworm parasite was now endemic across the UK, where once it was mainly found in the south.

“It is becoming a real problem not just in the south of England, it is moving north to Scotland,” said Dr Hodgson.

“It is a national problem and we all have to pay attention to the interactions between dogs and snails,” he said.

Happy trails

In the new work, the scientists were surprised to see so many snails followed the slimy trails laid by others. Dr Hodgson says it is all about conserving energy.

“We know that snails use about 40% of their energy budget producing slime.

“Given a chance, a snail will prefer to follow a trail that has been laid by another, it is a form of cheating like slipstreaming,” he said.

As to what pet owners should do, the scientists suggested they should regularly check the nooks and crannies in their gardens for snails and try to reduce exposure to the species.

“I wouldn’t be too happy suggesting that there should be a snail apocalypse and everyone should get rid of them,” said Dr Hodgson.

“I think awareness is a better idea, people need to understand the wildlife in their gardens and that no organism is totally harmless.”

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Article source: http://www.bbc.co.uk/news/science-environment-23798012#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa The feed :

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