Cicadas: The Mysterious 17-Year Bug Extravaganza
Every 17 years, a peculiar phenomenon unfolds across America’s suburbs and woodlands. The cicadas, those red-eyed, thrumming insects, emerge from the earth, creating a surreal spectacle that has captivated humans for centuries.
The Last Time
The last time these cicadas emerged was in 2008, during a period of global financial uncertainty, when iPhones were still a luxury item, and George W. Bush was still president.
The Current Surge
Now, reports from the citizen-science app Cicada Safari show that the first insects of Brood XIV, which emerge every 17 years, are surfacing in the US South. As ground temperatures warm across the North, millions more are expected to follow.
Cicadas: More Than Just Bugs
Cicadas belong to the insect order Hemiptera, which includes stink bugs, bed bugs, and aphids. However, they are often mistaken for locusts, a confusion that dates back to early English settlers who likened the mass emergences to Biblical plagues. Brood XIV itself was first documented in 1634.
Global Diversity
There are roughly 3,500 species of cicadas globally, many still unnamed. But periodical cicadas, which emerge en masse after 13 or 17 years, are unique to the eastern United States, with two additional unrelated species found in northeastern India and Fiji, says Chris Simon, a leading cicada expert at the University of Connecticut.
Fascinating Phenomenon
"Everybody’s fascinated by them, because you see nothing for 13 or 17 years, and then all of a sudden, your house and car are covered in these insects," Simon told AFP. "This is a marvelous phenomenon that you can take your kids to see and marvel at, watch them come out of their shells and wonder about how they evolved," she added, urging the public to appreciate, not fear them.
The Cycle of Life
Cicadas spend nearly their entire lives underground, passing through life stages called instars, before tunneling to the surface for a brief few weeks to molt, mate, and die. While their newly hatched offspring drop from trees and burrow into the soil, beginning the cycle anew.
Mating Calls and Defense
Males produce their deafening mating calls using tymbals, sound-producing membranes on either side of their abdomens, creating a chorus that’s been likened to sirens or power tools. They don’t bite or sting, and they don’t eat solid food in their adult form, though they drink water. Instead, their defense is overwhelming abundance swarming in such numbers that they satiate predators like birds, raccoons, foxes, and turtles, playing a crucial role in the ecosystem.
Human Impact
But their survival strategy is increasingly challenged by human-caused changes. Widespread deforestation and urbanization have destroyed habitat. And now, climate change is triggering more frequent occurrences of "stragglers" cicadas that emerge four years too early or too late, often in numbers too small to survive, which could threaten long-term population numbers.
Political Climate
Under President Donald Trump, the federal government has fired scientists en masse and frozen funding for new research. Simon submitted a grant proposal last August to the National Science Foundation for a major genetic study into cicadas’ internal clocks, biological mechanisms that somehow track the passage of years, unlike humans’ 24-hour circadian cycles.
The Future
"Nobody knows what’s happening," she said, decrying the current attacks on science. The cicadas continue to intrigue scientists, especially given the evolutionary logic behind their prime-numbered life cycles remains unresolved.
Historical Significance
Cicadas are often thought of as "creatures of history," conjuring memories of past life chapters, what you were doing when this brood last emerged. They spend nearly their entire lives underground, passing through life stages called instars, before tunneling to the surface for a brief few weeks to molt, mate, and die — while their newly hatched offspring drop from trees and burrow into the soil, beginning the cycle anew.
Conclusion
The cicadas’ emergence is a fascinating natural phenomenon that continues to captivate and intrigue scientists and the public alike. As the world continues to evolve, the cicadas’ survival strategy is increasingly challenged by human-caused changes, but their mysterious allure remains undiminished.
Reference : https://timesofindia.indiatimes.com/science/seventeen-years-later-brood-xiv-cicadas-emerge-in-us/articleshow/120800071.cms
