The appearance of southern spiders in the Arctic initiated the creation of a system for geotechnical monitoring of permafrost

Participants in the expedition of the institutes of the Russian Academy of Sciences “Clean Arctic - East - 77” reported the appearance of more southern species of spiders and birds in the Arctic Circle. The unevenness of their appearance at the same geographic latitude showed that the northern border of their ranges did not shift along the entire length, but formed several protrusions in the northern direction in the form of petals. "Petal thawing” referrs to the emergence of zones with a width of 50 to 200 kilometers at the southern base where permafrost is thawing.