Mice are Evolving: What it Means for Rodent Problems in US Cities
Summary
A Rutgers University study found that many city mice are developing genetic changes that make common mouse poisons less effective. These mutations help mice survive poison treatments, which could make controlling rodent problems in U.S. cities harder.Key Facts
- About 70% of tested mice had mutations that help them resist common rodent poisons.
- Rats also showed some mutations, but are still more vulnerable to poisons than mice.
- The study focused on mice and rats from cities like New York, New Jersey, Pennsylvania, and Washington, D.C.
- The genetic changes affect a gene called Vkorc1, linked to how poisons disrupt blood clotting in rodents.
- Resistance to rodenticides grows because mice with mutations survive and reproduce more.
- Rodents spread disease and can damage property and food supplies.
- New York City has struggled with rat infestations, but recent efforts may have reduced sightings by about 15%.
- The findings are important because rodent control is already a challenging issue in many U.S. cities.
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