New Research Challenges Long-Held Beliefs About London‘s ‘Underground Mosquito’
London,UK - A new genetic study is challenging the widely held belief that the mosquito found in London’s Underground has uniquely adapted to the subterranean environment,evolving into a distinct species. The research, published recently, suggests the mosquito – Culex molestus – likely carried the genetic traits allowing it to thrive underground before colonizing the Tube system.
For decades, scientists believed the London Underground mosquito represented a reproductively isolated population that had adapted to the unique conditions of the tunnels. Early research, limited by technology, pointed to specific genetic markers suggesting this isolation.”We interpreted these results to imply that some of the above underground population had adapted to the London (Tube) system and become reproductively isolated from them,” explained one of the original researchers, acknowledging the new data provides a more extensive picture. “In those days we could only readily survey 20 genes – not whole genomes,” he said. “Our results still stand, but the interpretation has changed.”
The new study, utilizing whole genome sequencing and a broader range of samples, reveals Culex molestus mosquitoes with similar genetic profiles exist in subterranean habitats worldwide.This suggests the ability to survive and breed in these environments - characterized by consistent temperature, humidity, and the presence of a blood source – is ancestral, not a recent adaptation specific to london.
“while often portrayed as having adapted specifically to the London Underground, this mosquito is actually well known to be associated with subterranean habitats around the world,” said Cameron Webb, an associate professor of medical entomology at the University of Sydney and NSW Health Pathology in Australia, who was not involved in the study. He added the research demonstrates the ancestral basis for the mosquito’s ability to exploit the London Underground.
Culex molestus is known for its adaptability, including a preference for blood meals from mammals, indiscriminate biting, and the ability to breed year-round in confined spaces. The findings underscore the importance of understanding the biology of lesser-studied mosquito species as urban environments continue to evolve, potentially creating new opportunities for pest and public health concerns. “As the design of our cities adapts in response to a changing climate,we must ensure we don’t create more opportunities for mosquitoes,” Webb concluded.
