/ecosystems/article/44866?utm_source=feedburnerutm_medium=feedutm_campaign=Feed%3A+SustainableEcosystemsAndCommunityNews-Enn+%28Sustainable+Ecosystems+and+Community+News+-+ENN%29
Raccoons are intelligent and voracious. It adapts well to many environments. It is more like an invader species that can escape and is able to adapt and survive in new habitats. According to a new study, its expansion across Spain and Europe is bringing infectious and parasitic diseases like rabies. This puts the health of native species and people at risk. Originating in North America, the raccoon (Procyon lotor) is an invasive species that has established itself in Europe due to hunting and the fur trade along with its occasional acquisition as a pet. In Spain, its presence in the wild is already commonplace in Madrid and Guadalajara and is sporadic in other regions such as the island of Mallorca. Its presence is however far from welcomed.
ADVERTISEMENT
As a result of escapes and deliberate introductions in the mid-20th century, the raccoon is now distributed in several European and Asian countries. Sightings have occurred in all the countries bordering Germany, which hosts the largest population outside of North America. Another stable population exists in northern France, where several pet raccoons were released by members of the U.S. Air Force near the Laon-Couvron Air Base in 1966. About 1,240 animals were released in nine regions of the former Soviet Union between 1936 and 1958 for the purpose of establishing a population to be hunted for their fur. Two of these introductions were successful: one in the south of Belarus between 1954 and 1958, and another in Azerbaijan between 1941 and 1957.
“Due to its rapid expansion and the long list of illnesses that it may carry, it poses a health risk that we must bear in mind,” as outlined to SINC Beatriz Beltrán-Beck, the lead author of the study published in the European Journal of Wildlife Research and researcher at the Research Institute of Hunting Resources (IREC, joint centre of the University of Castilla-La Mancha, the CSIC, and Castilla-La Mancha Council).
Bearing in mind that its population density could exceed 100 raccoons per km2, the success of the expansion of this small opportunistic carnivore is down to its ability to quickly adapt to different surroundings and omnivorous food habitats, its high reproductive potential and the absence of natural predators.
However, as Beltrán-Beck points out, “the impact that their expansion and invasion could have on the environment and the health of native species and humans is unknown.” The researcher adds that the increase in population numbers and expansion to other countries and/or urban environments could increase the transmission of dangerous parasites and illnesses to domestic animals and humans.
Rabies and a very pathogenic parasite to man (Baylisascaris procyonis), which was found in Germany, are some of the most significant illnesses found in the raccoon. But, along with bacterial illnesses, these are added to the West Nile virus which affects human, birds, horses and sheep.
Although in Western Europe rabies have been eliminated thanks to the oral vaccination for foxes (Vulpes vulpes), there is still concern that the raccoon could complicate the situation in some areas of Eastern Europe that are still home to rabies. In recent years 142 cases of rabies in raccoons have been identified, above all in Ukraine, Estonia, Germany and Lithuania.
This small American carnivore has been confirmed to be the host of the nematode worm Baylisascaris procyonis, which is responsible for Larva migrans, an illness caused by larval migration and parasite persistence under the skin, in the brain and in other organs. In the past this disease could only be found in America but is now emerging and on the rise in Europe.
Some of the most important bacterial diseases which affect raccoons are leptospirosis, listeriosis, tetanus, and tularemia. Although internal parasites weaken their immune systems, well-fed individuals can carry a great many roundworms in their digestive tracts without showing symptoms. The larvae of the Baylisascaris procyonis roundworm, which can be contained in the feces and seldom causes a severe illness in humans, can be ingested when cleaning raccoon latrines without wearing breathing protection.[
Given its exotic origin and its rapid expansion since the 1970′s, the raccoon is considered an invasive species in Europe. However, the majority of European countries, like Spain, do not control the trade of this animal, which is introduced onto the market as a pet.
“The case of Spain is a good example. The origin of its expansion is probably due to it escaping from the home where it was kept as a pet and due to the owners releasing it into the countryside…” adds the researcher.
Due to its adaptability, the raccoon has been able to use urban areas as a habitat. The first sightings were recorded in a suburb of Cincinnati in the 1920s. Since the 1950s, raccoons have been present in Philadelphia, Washington, DC, New York City, Chicago, San Francisco, Los Angeles, and Toronto. Since the 1960s, Kassel has hosted Europe’s first and densest population in a large urban area, with about 50 to 150 animals per square kilometer (130—400 animals per square mile), a figure comparable to those of urban habitats in North America.
For further information see Raccoon in Europe.
Raccoon image via Wikipedia.
