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Wild boar is not a native species in Canada. The current situation of wild boar flooding is caused by the Canadian government. The invasion of wild boar in Canada is definitely a negative textbook!

The cause and effect of Canadian wild boar invasion

In the1980s, in order to improve the meat quality of local pigs and increase the proportion of meat in pork, Canada introduced European wild boar to cross with local pig breeds, and the effect was actually good. This kind of hybrid pig has similar operation in China, and the meat quality has indeed improved. Everything is developing in the direction that everyone imagines!

However, the domestic demand for meat in Canada began to slow down in the 1990s. A large number of hybrid varieties of wild boar and domestic pig are unsalable, and the high breeding cost makes the farm on the verge of bankruptcy. In order to reduce costs and increase income, some pig farms put hybrid pigs in semi-open farms and invite people who like hunting to kill wild boars.

After that, I believe everyone can guess that the wild boar ran out of the farm. Of course, there are also data showing that some bankrupt pig owners directly release wild boars into the wild. In short, the wild boar ran out of the farm and ran into the wild. In fact, Canada had already heard about the wild boar flooding in the United States in the 1980s, because European colonists brought wild boar into the United States in the19th century. By the 1980s, the problem of wild boar in the United States had been raging, and Canadians didn't seem to take it to heart.

The development of the four periods in the United States was already very serious in the 1980 s.

In fact, their indifference seems to be reasonable. For example, Saskatchewan, where there are more wild boar than people, has a southernmost latitude of 49 degrees, which is equivalent to the latitude of Heihe City in Xiaoxing 'anling region of China. The coldest winter can reach MINUS 40 degrees, such as Prince Albert Town in central Saskatchewan. The weather forecast for February 26th, 20021year is as follows:

As we all know, it is not the coldest time now, and the coldest temperature is easily below MINUS 40 degrees. Therefore, officials of the Canadian Ministry of Agriculture are optimistic that these wild boars who escaped from the wild can't spend the winter in Canada at all, so they turn a deaf ear to the experience of American horses losing their forepaws. Obviously, the development of wild boar in Canada far exceeds their optimistic estimate!

The domestic pigs in the ice and snow are fine.

It only takes 30 years to give you a wild boar in Canada.

From 1990, when wild boar really began to develop, to 202 1 year now, in just 30 years, wild boar has not only adapted to the cold in Canada, but also has a tendency to occupy Canada, from British Columbia to Quebec, from Ontario to Saskatchewan, and has spread all over the low latitudes of the US-Canada border.

Data Map of Papers in Science Report, a Sub-publication of Nature.

The problem of wild boar in Canada has caused a great uproar in Science Report, a subsidiary of the top journal Nature, but it is used as a case:

Screenshot of paper

How to quickly and effectively monitor and map the distribution of invasive species, Canadian wild boar has become a negative textbook. The rapid growth of wild boar will occupy wetlands and river valleys, seriously crowding out native species originally there, and once they gain a foothold, the consequences may be out of control.

Ryan Brook, an associate professor at the University of Saskatchewan, believes that if you don't put everything at hand aside and concentrate on dealing with the problem of wild boar immediately when you find traces of wild boar, you must be crazy. In fact, when you just found the trail of wild boar, Saskatchewan officials were slow to deal with it. There are now more wild boars in Saskatchewan than the total population of the province (the number of wild boars exceeds 1 10,000).

How many wild boar are there in Canada?

No one may be able to explain this problem clearly. The reproduction of wild boar obviously exceeds the estimate of Canadian authorities, and the super-high reproduction rate of wild boar directly makes the authorities dumbfounded. The gestation period of wild boar is 1 14 days, and the maximum number of piglets per fetus is 12, which can be reproduced twice a year. How many pigs will they become in ten years?

Of course, this is a mathematical game, which is different from the actual situation in the field, but it is true that the number of wild boar in Saskatchewan has soared, because it is estimated that the total number of wild boar in Saskatchewan has exceeded 65.438+00,000, which Brian Keating, a wildlife columnist of Saskatchewan Broadcasting Corporation in Canada, called an ecological disaster.

In southern Saskatchewan, red indicates the city where wild boar was found.

Because the number of wild boar increased too fast, many wild boars left the forest and went to the countryside to look for food. They eat everything, destroying crops and farmland and seriously damaging crops such as wheat, corn and oats. A wild boar can destroy 4 hectares of land, and it also poses a serious threat to birds, reptiles and small mammals that breed in bushes. Because wild boar is omnivorous, hungry wild boar will walk on the road and cause traffic accidents, weighing 100 ~.

In response to the proliferation of wild boar, the Canadian authorities announced that wild boar is not a game animal, but a harmful animal. Canadians can kill wild boar without permission and set up incentives. Since 2003, several provinces with the worst wild boar invasion in Canada, such as Alberta, have encouraged residents to hunt wild boar, with the number of ears of wild boar, the price of each pair is 50 dollars.

Wild boar meat products

Canada has also formulated wild boar recipes to sell to tourists who come to Canada, but this sporadic hunting and unstable sales have not helped to increase the number of wild boar, and the number of wild boar in Canada is still growing at a rate of more than 9% every year.

Trap and kill wild boar

According to a paper in Nature, most of the wild boar in Canada are concentrated in Saskatchewan, accounting for more than 50% of the national total. According to this estimate, the number of wild boar in Canada is about 2 million, but now it has spread to other provinces on the border between the United States and Canada, and more numbers have not been effectively counted, so the actual number may be more.

Similarly, the flooding of wild boar has caused losses of more than $65.438+0.5 billion to 38 states south of 36 north latitude in the United States (by February 2020, there will be about 7-8 million wild boars in the United States). Unlike Canada, the United States was introduced from Europe in the 654.38+09 century to meet the needs of hunting and breeding. However, it is puzzling that there is a precedent for the proliferation of wild boar in the United States, and Canada is one of them.