The number of Butterfly "Okabama-madara" who moves massively like migratory birds is decreasing rapidly

byBernard Spragg. NZ

One type of butterfly inhabiting mainly from North America to South AmericaGreat blowjob"Is a large-scale" 3,500 kilometers "in a yearMigrationIt is known to do. However, in recent years it has been reported that the population of Pinus thunbergata is rapidly decreasing.

Beyond Pesticides Daily News Blog »Blog Archive Monarch Butterfly Numbers Keep Declining - Beyond Pesticides Daily News Blog

99% of the birds living in North America are forests of 'Oyamel' which is a kind of fir trees distributed in the mountains of central Mexico from autumn to winterTo overwinterIt is known that when the temperature rises again it will return to North America. When going south from North America to Mexico, we will cross over a generation, but when we go north from Mexico to North America, we will shift generations on the way and will cross over 3 to 4 generations, It seems that there is a tendency that the generation to do has a longer life span than the generation that goes northward.

Too many massaccoons come to Mexico, so the branches of the tree of the oyamel who have stopped the bird's eye bells may be broken due to the weight of the bird's eye. We found that the number of winter wintering in Mexico in 2018 is 15% less than the number wintering in 2017.

When measuring the population of Spotted Monoptera, the number of individuals is estimated from the area of ​​the trees where Okabama-mara stopped orange, but in 2017 the area of ​​orange which was 2.91 hectares (21,900 square meters) was , It decreased to 2.48 hectares (24,800 square meters) in 2018. It is said that the population of Pinus thunbergata has declined steadily since 1996 and has decreased by 80% in the past 20 years.

byTarnya Hal

Scientists and conservation organizations have explained the reasons why the population of the monarch is decreasing rapidly. "In addition to the extreme climate change in recent years, illegal deforestation conducted from Mexico to California has led to the habitat of the monarcharidae In addition, due to agricultural chemicals sprayed to protect agricultural crops, a large number of dead birds that are breeding in the vicinity of the farmland are dead, "he says, as the artificial impact is great for the decrease in the bird population is. In the United States, 165 million hectares (16,500 kilometers) of the breeding grounds inhabiting the monkey can be lost by pesticides.

It is thought that urgent countermeasures are required as the number of black birds is decreasing at this pace, the possibility of extinction of Monarch birds will be 72% in the next 20 years and 86% in 50 years. At the end of 2017 more than 100 animal conservation groups and environmental protection groupsUS Department of AgricultureI asked for an increase in funds to protect Mr. Okabamadara.

However, cooperation of people engaged in agriculture in the habitat of the monarch is essential not only for government policy but also for protecting the birds. It is a media appealing to ban the use of harmful pesticidesBEYOND PESTICIDESays that you can protect insects including the birds by buying products that do not use pesticides. "BEYOND PESTICIDE is spared, even with organic farming methods that do not use agricultural chemicals, maintaining high yields by adequately managing the surrounding environment."

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in Science,   Creature, Posted by log1h_ik