The brown rat is the undisputed winner of the real rat race.
They crawled out of ships that arrived in North America earlier than previously thought, outmaneuvered rival rodents, and subsequently enraged and disgusted city dwellers for generations, according to a new study. It became so ubiquitous that it became known as the common rat, street rat, or rat. Sewer rat.
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It didn’t take long to drive out the black rat, which probably arrived with Columbus and flourished in colonial cities.
On July 7, 2000, rats swarm garbage bags near trash cans in New York City. A study published in the journal Science Advances on Wednesday, April 3, 2024, suggests that brown rats were crawling off ships that arrived in the Americas earlier than previously thought. Rodent rivals who won the competition. Infuriating and disgusting generations of city dwellers, they became ubiquitous in North American cities and became known as brown rats, street rats, or sewer rats. (AP Photo/Robert Messia)
After first appearing on the continent before 1740, brown rats took over the East Coast from black rats “within just a few decades,” said Michael, one of the authors of the study published Wednesday in the journal Science Advances. Buckley said.
Matthew Fry, a researcher and community educator with Cornell University’s New York State Integrated Pest Management Program, said brown rats are larger and more aggressive than black rats, and they like to get closer to human groups. .
The study “gives us a more accurate timeline of when they arrived and what they’ve been doing since they got here,” said Fry, who was not involved in the study. said. “If we have pictures of rat populations, we can better understand what rats are doing and how we can manage them.”
Neither rat species is native to North America, said Buckley of the University of Manchester, UK. Scientists thought brown rats arrived around 1776, but a new study pushes the date back more than 35 years.
Buckley and his colleagues analyzed rodent bones that had already been unearthed by archaeologists. The remains were unearthed from 32 communities in eastern North America and the Gulf of Mexico, dating from the founding of Jamestown in 1607 to the early 1900s. Other samples were from his seven shipwrecks from 1550 to about his 1770s.
Study author Ryan Kennedy from Indiana University, who studies animal remains at archaeological sites, said the data shows that the transatlantic transportation network “essentially acted as a rat highway.” The study suggests that brown rats had an early foothold in coastal transportation centers.
Researchers suggest that one possible reason for black rat dominance is that black rats ate food that black rats would normally consume, which reduced their reproduction. It is said to be a possibility. Historical anecdotes support this finding, explaining that black rats all but disappeared from cities in the 1830s.
Both types of rats now inhabit North American cities, but brown rats are more prevalent. Some city centers are especially crowded. For example, New York City hired a “rat czar” last year to tackle the city’s growing problem.
The biggest problem? Rats can transmit disease. Brown rats are known to spread a bacterial disease called leptospirosis, which is caused by bacteria in the urine of infected animals. It can also help spread foodborne bacteria like typhus and salmonella.
Experts said knowing which type of rat is leading the pack can help cities control the pest, even though it may not seem like it.
For example, brown rats prefer to hang out on or near the ground, rather than in trees and other high places, which black rats prefer.
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Both black rats and brown rats are omnivores, but brown rats have a particular preference for animal foods. So reducing animal products in food waste “should be the biggest opportunity to reduce the value of urban habitat for rat populations,” Buckley said.
Mr Fry said any effort to reduce available food waste would help.
“The biggest reason brown rats exist is food availability,” he says. “Any effort to keep rats away from food sources is an effective measure.”
