"We kept discovering the same thing. Within a given apartment, or even a given building, there was extremely low genetic diversity," said Schal. "In most cases there's just a single female that founded the population."
Research: Bedbugs can thrive despite inbreeding →
Schal said that was a surprise, since an animal or insect population with limited diversity will usually build up and then crash, because genetic defects tend to magnify with inbreeding.