Dinosaurs and Bedbugs
Bedbugs – some of the most unwanted human bed-mates – have been parasitic companions with other species aside from humans for more than 100 million years, walking the earth at the same time as dinosaurs.
Work by an international team of scientists, including the University of Sheffield, compared the DNA of dozens of bedbug species in order to understand the evolutionary relationships within the group as well as their relationship with humans.
The team discovered that bedbugs are older than bats – a mammal that people had previously believed to be their first host 50-60 million years ago. Bedbugs in fact evolved around 50 million years earlier.
Bedbugs rank high among the list of most unwanted human bedfellows but until now, little was known about when they first originated.
Experts have now discovered that the evolutionary history of bed bugs is far more complex than previously thought and the critters were actually in existence during the time of dinosaurs. More research is needed to find out what their host was at that time, although current understanding suggests it’s unlikely they fed on the blood of dinosaurs. This is because bed bugs and all their relatives feed on animals that have a “home” – such as a bird’s nest, an owl’s burrow, a bat’s roost or a human’s bed – a mode of life that dinosaurs don’t seem to have adopted.
The team spent 15 years collecting samples from wild sites and museums around the world, dodging bats and buffaloes in African caves infected with Ebola and climbing cliffs to collect from bird nests in South East Asia.
Professor Mike Siva-Jothy from the University of Sheffield’s Department of Animal and Plant Sciences, who was part of the team, said: “To think that the pests that live in our beds today evolved more than 100 million years ago and were walking the earth side by side with dinosaurs, was a revelation. It shows that the evolutionary history of bed bugs is far more complex than we previously thought.”
Dr Steffen Roth from the University Museum Bergen in Norway, who led the study, added: “The first big surprise we found was that bedbugs are much older than bats, which everyone assumed to be their first host. It was also unexpected to see that evolutionary older bedbugs were already specialized on a single host type, even though we don’t know what the host was at the time when T. rex walked the earth.”
Credit: University of Sheffield
Professor Klaus Reinhardt, a bedbug researcher from Dresden University in Germany, who co-led the study, said: “These species are the ones we can reasonably expect to be the next ones drinking our blood, and it may not even take half a million years, given that many more humans, livestock and pets that live on earth now provide lots more opportunities.”
The research has been published in Current Biology.
Contacts and sources:
Citation: Bedbugs Evolved before Their Bat Hosts and Did Not Co-speciate with Ancient Humans
Steffen Roth, Ondřej Balvín, Michael T. Siva-Jothy, Osvaldo Di Iorio, Petr Benda, Omar Calva, Eduardo I. Faundez, Faisal Ali Anwarali Khan, Mary McFadzen, Margie P. Lehnert, Richard Naylor, Nikolay Simov, Edward H. Morrow, Endre Willassen, Klaus Reinhardt.. Current Biology, 2019; DOI: 10.1016/j.cub.2019.04.048
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