Although reports of swine invasion are more like a joke to Americans from the southern US do not come much fun. Wild and feral pigs is becoming extremely difficult non-native species, which grows extensively in numbers and increasingly penetrates into the cities. It's not just about problems with overturned rubbish bins, which collect for food or a car accident blocked the road. Irritated because pigs can be quite dangerous to people. The situation must be addressed by the Ministry of Agriculture (USDA), because existing damage repeatedly outperform the provision for payment of compensation.
Program control and regulation abundance while a year comes to $ 1.5 billion. "But without further immediate support of our efforts is a growing area of the United States becomes more susceptible to invasion," says the report published in the Journal of Applied Ecology. Where the disaster takes grunting? It is a rambling "cluster" pigs naturally living freely in the wild (wild boar), pigs escaped from farms and farms, now living freely, often for several generations (feral pigs) and to nature "fresh" launched domestic pigs.
Apart from purely agricultural installations and establishments is their major source also planting wild boar brought from Europe in the territory of private hunting grounds. Given that among their natural predators on the territory of the state can count only a bear or cougar (who are not here now abound), does not hit the pigs on any barriers to the growth or spread. Dig fields and parks, manages landfills, polluting the streets, conquering into bins and containers. And there are still more.
While in the 1982-1988 period, their presence was reported in 630 districts (out of 3141) at the end of 2012 was already the incidence observed in 1,358 counties. The increase and spread of fever is most evident in the districts of southern and western states. Virtually no wild boar but in outposts enclaves occurring in the territory of 35 states. This is not about any modest numbers. Their number is estimated management of the National Programme for the management of damage caused by wild pigs at 5-6 million.
"Wild and feral pigs are choosing those areas that are of climatic conditions similar to those which are commonly used," says Gail Keirn of NWRC. "From their advance northwards but we are partly to blame and climate change. Last winter had been very weak and the spread of swine constitute an obstacle. That absence of winter is then responsible for ensuring that the boars may also spread into areas that are not otherwise fairly atypical. "
The boundaries of their occurrence every year moves to the north about 12 kilometers, which means that in 30-50 years the "bitter-sweet" problem of the western and southern US states, the question becomes nationwide importance.
Author: Radomír Dohnal
Source: Ekolist.cz