Biologists from Canada found that the mortality rate of young grizzly in urban areas is high, but adult bears adapt to life near humans, going to night lifestyle. However, they don’t live up to 14 years when they manage to translate activity at night, and to maintain the population needed a constant migration of grizzly pristine environment. Article published in the journal Proceedings of the National Academy of Sciences.
Large predators that live in the neighborhood with a man who may be a threat to tigers and leopards attack on villages in Asia, a dangerous shark encounters occur in different parts of the world, and in North America and Europe, brown bears are often faced with people. To protect themselves, people kill predators, and life in the occupied territories a person becomes a threat to the animals themselves. In the end, the ranges of many predators fall to the wild nature for which man is not affected.
However, there is a second scenario in which animals adapt to life near humans. Worldwide predators again expand the areas and return in urban or rural areas. It is possible to maintain the numbers of some types and more no need to save wilderness areas, but we need to help the animal to integrate into the human world and to reduce the human factors, because of which the predators die.
Scientists from Canada, under the leadership of Clayton lamb (Clayton Lamb) from the University of Alberta, explored the demographic and behavioral ways to fit a grizzly bear to life in urban areas. This for 41 years collected data on deaths, births and movements 2669 bears of North America. Individual animals were identified by genetic analysis (it has spent almost six thousand times), and the degree of human impact on the territory, which were grizzly, estimated from satellite imagery.
The population density of bears was lower than the more urbanized was of the territory — this was due to the high mortality rate of young bears in areas with strong human impact. However, although the man was the main cause of death of bears, adult grizzly bear mortality is almost not depended on the degree of urbanization. The fact is that with age, the predators that lived alongside the people who switched to nocturnal. After three years, the bears every year increased night activity for two to three percent, increasing their survival on those same two to three percent. In the wild this shift to the night lifestyle didn’t happen, and therefore it is not caused by genetic program and causes it can influence.