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Monday, 21 April 2014

Zut alors! What is this flatworm in my escargot?

Voracious feeder: The invasive New Guinea flatworm (Platydemus manokwari) has a huge appetite for snails. -Photo from AFP

Voracious feeder: The invasive New Guinea flatworm (Platydemus manokwari) has a huge appetite for snails. -Photo from AFP

An invasive species of flatworms from South-East Asia is threatening to decimate a European culinary delicacy.

Snails, one of France’s signature dishes, could be off the menu if the country fails to stem an invasion by a slimy worm from South-East Asia. The warning is being sounded over a voracious species called the New Guinea flatworm. It is already on a list of the 100 most dangerous invasive species in the world as it has a relentless appetite for native snails and earthworms in places where it has been introduced.

Workers at a botanical garden in Caen, Normandy, called in scientific help after they spotted a strange, dark, flat-as-a-pancake worm among their greenhouse plants. Reporting in the journal PeerJ, a team of French experts said DNA tests had confirmed their worst fears: Platydemus manokwari has arrived in Europe.

“This species is extraordinarily invasive,” said Jean-Lou Justine of the National Museum of Natural History. “I really hope it can be stopped at the earliest stages. All snails in Europe could be wiped out. It may seem ironic, but it’s worth pointing out the effect that this will have on French cooking.”

P. manokwari measures about 5cm long by 5mm wide. It has been introduced, sometimes deliberately, in more than 15 countries and territories in the Pacific. Biologists are alarmed by its appetite for snail. The worm can even pursue gastropods up tree trunks – and when supplies of snails run out, it can tuck into other soil species, including earthworms.

The worm’s ancestral habitat is the mountains of New Guinea, at altitudes of 3,000m and above, where the temperature is moderate. Tests have shown the worm can survive temperatures down to 10°C, which gives it a good chance of surviving in temperate, snail-friendly parts of Europe.

Platydemus manokwari represents a new and significant threat to biodiversity in France and Europe, which hosts hundreds of species of snails, some of which are endangered and protected,” said PeerJ, a publisher of peer-reviewed studies.

P. manokwari has a distant cousin, the New Zealand flatworm (Arthurdendyus triangulatus), which has triggered an invasive-species scare in western Europe. It has invaded the whole northern British Isles, and is blamed for big reductions in earthworms which play an essential part in aerating and fertilising the soil.

Other European countries have set in place monitoring measures in a bid to prevent it being imported through plants and agricultural products. – AFP

Tags / Keywords: Environment , Environment , Ecowatch , escargot , endangered species , France , New Guinea flatworm


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