Big Guru spiders to occupy east coast of US | Science

Aggressive guru spiders threaten the US East Coast, which moved in 2014, but they may colonize many areas in the future.

Zorro spider, scientifically known as Trichonobila clavata, is a large, brightly colored spider. The original home of this spider is Japan. It also spreads to other parts of the Asian continent, such as Korea, Taiwan and China. The spider began invading Southeastern American lands – especially the state of Georgia – between 2013 and 2014.

Fast spreading gas

Guru spider is not a dangerous spider. Adult females range in size from 17 to 25 millimeters, while adult males range in size from 7 to 10 millimeters. Their fangs are usually too short to pierce human skin.

However, the east coast of the United States is now threatened by the invasion of many of these fast-spreading species. She pointed out Recent study review The black-and-yellow color of the organism does not present any barrier to transmission, according to the journal Physiological Endomology.

According to To report The study, published by Science Alert, compared the spider to another invasive spider native to Georgia, the golden silk spider.

The comparison shows that Spider Guru has a faster metabolic rate, higher heart rate and greater resistance to cold. In addition, this spider has shown its value in colonizing most of its native Japan, which has a climate similar to that of the United States, and the two countries are located at approximately the same latitude.

According to To the press release Published by the University of Georgia on March 3, ecologist Andrew Davis said, “The spider guru family may occupy much of the East Coast, which is highly anticipated.”

To achieve these results, the researchers identified several aspects of the comparison between the two spiders mentioned above to determine the ability of guru spiders to spread in the United States.

Various tests

First, researchers studied the amount of oxygen spiders consume to determine their metabolic rate. They found that the metabolic activity of the guru spider was twice as high as that of the golden silk spider. “This high metabolic rate allows spiders to grow and develop at low temperatures,” the researchers said in their study.

After the spiders were frozen for 10 minutes, the researchers studied the heartbeats of two types of spiders at low temperatures. The researchers found that Guru Spider’s heart rate was 77 percent higher than that of the Golden Spider. This reaffirms the ability of these spiders to withstand the cold.

Finally, the researchers determined the spiders’ ability to withstand the cold. The spiders were placed in a freezer in which the temperature gradually dropped from 10 C to below zero for 15 min.

The researchers noted that none of the spiders in the Guru family died during the experiment, but some of them survived the cold. In contrast, 4 golden silk spiders died and 6 were injured as a result of exposure to these cold conditions.

Quick guests

The researchers followed the map for the spread of the Guru spider from 2015 to 2021, and they noticed that the rate of spread of these spiders was rapid.
Guru Spider was able to colonize North and South Carolina, Tennessee and Oklahoma – with the exception of Georgia – in a matter of years. In comparison, the golden silk spider has only existed in the southeastern United States since its arrival 160 years ago.

Based on these three experiments and knowledge of the geographical distribution, the researchers concluded that the physiology of the Guru spider, which is confined to the southeastern United States, is more physiologically comparable to that of the cold environment. Frost tests also showed that the golden silk spider, unlike the Guru spider, could not freeze for long.

Researchers point out that Guru Spider did not bring his will to this new environment. They believe these spiders came from Japan hidden in shipping containers. Therefore, they are urgent guests of the American context.