Earwigs Infected With Parasites Head Towards Water
Researchers have discovered that European earwigs infected with the parasitic roundworm Mermis nigrescens tend to head towards open water, contrary to their typical behavior of avoiding it, and have identified changes in gene activity that contribute to this behavior
Earwigs infected with the parasitic roundworm Mermis nigrescens have been found to head towards open water, a behavior that is unusual for these insects. Typically, earwigs avoid open water, but the infection appears to alter their behavior.
The molecular and biological reasons for this behavior have not been fully understood until recently, when a study was conducted by researchers at the University of Otago, the New Zealand Institute for Bioeconomy Science Limited, the University of British Columbia, and Brown University. The study's findings were published in Proceedings of the Royal Society B: Biological Sciences.
The researchers used RNA sequencing to examine gene activity in both earwigs and the worms infecting them. They collected European earwigs and compared uninfected individuals with those at early and late stages of a Mermis nigrescens infection. This approach allowed them to identify changes in gene activity that contribute to the water-seeking behavior.
The study was led by Neil J. Gemmell, the senior author of the paper. Gemmell's interest in the topic was sparked by observations of native New Zealand insects, called wētā, that were found drowned in puddles with parasitic worms erupting from their bodies.
## Why it matters The discovery of the genetic processes contributing to the water-seeking behavior of infected earwigs provides new insights into the complex interactions between parasites and their hosts. This knowledge can help us better understand how parasites manipulate their hosts' behavior and how this can impact ecosystems. The findings of this study can also contribute to the development of new strategies for controlling parasitic infections in insects and other animals.
The study's results highlight the importance of continued research into the molecular and biological mechanisms underlying the behavior of infected insects. By understanding these mechanisms, scientists can gain a deeper appreciation of the complex relationships between parasites and their hosts, and develop new approaches to mitigating the impacts of parasitic infections on ecosystems.
