“To our knowledge, Bogon Moss is the first species identified to navigate using stars,” said Andrea Aden, a postdoctoral researcher at the Francis Crick Institute in London, who contributed to this research.
The researchers uncovered the stellar navigation abilities of moths by capturing wild bogon moths and suspending them with fine tungsten rods inside a small cylindrical “flight simulator.”
With its back affixed to the rod, the moth flapped its wings within the simulator, allowing it to turn as if it were flying in a natural environment.
“It can rotate freely,” noted David Dreyer, a researcher at Lund University and a co-author of the study. “You can choose the direction you wish to fly.”
The researchers created a magnetic vacuum to neutralize the moth’s internal magnetic compass, allowing them to focus on other sensory inputs.
Images of the night sky were projected onto the top of the flight simulator.
During trials, researchers manipulated the rotation of the sky, noting that the moth adjusted its flight patterns to adapt and establish new headings. However, the moths became disoriented when presented with randomized, fragmented sky images within the simulator.
“The moths were entirely confused,” Dreyer explained. “For us, this served as compelling evidence that they indeed utilize stars for navigation.”
In additional experiments, researchers drilled a small opening in the moths’ brains, inserted a glass tube into a neuron, and recorded the electrical impulses triggered by star projections. They discovered that electrical activity peaked when a specific angle of the sky was depicted. Conversely, there was little response to randomly generated patterns.
According to the findings, Bogon Moss possesses limited vision and likely perceives only a select few of the brightest stars. The researchers suspect that these moths navigate by the Milky Way.
“They probably perceive the Milky Way much more vividly and luminously than we do,” stated Warrant.
Furthermore, Warrant proposes that moths likely utilize olfactory cues as they approach alpine caves.
“They are probably detecting compounds emitted from the cave—odorous markers that act as olfactory beacons leading them there,” he mentioned, adding that these smells resemble the scent of decaying meat.
These moths have a lifespan of about a year, spending a dormant summer in the cave before returning to their original location.
Ken Rohman, a professor at the University of North Carolina’s Department of Biology, noted that although he did not participate in the research, he found the study compelling, with experiments that were both thoughtful and rigorously controlled.
“One of the remarkable aspects of this study is how moths manage such extensive navigation with a relatively small brain,” said Roman, who studies animal migrations. “This highlights the ingenuity driven by natural selection.”
Bogon Moss is currently at risk and was listed by the United Nations for the Conservation of Nature in 2021. The authors assert that these new insights could assist in preventing the decline of the species.
“Moth populations have dramatically decreased in recent years, particularly due to the droughts and wildfires experienced in Australia in 2020,” added Aden. “Understanding that they rely on vision as part of their navigational toolkit can inform conservation strategies, especially concerning light pollution in urban settings.”
Source: www.nbcnews.com
