COLUMBIA, Md. (AP) – Sifting through a dirt-laden shovel in a suburban backyard, Michael Raupp and Paula Shrewsbury find their career: a cicada nymph.
And then another. And another. And four more.
In perhaps a third of a square foot of land, entomologists at the University of Maryland find at least seven cicadas – a rate of just under a million per acre. A neighboring court gave a rate closer to 1.5 million.
And there is much more to do. Billions of black bugs with red eyes are arriving, scientists say.
In a few days, a few weeks at most, the Brood X cicadas (the X is the Roman numeral for 10) will emerge after 17 years underground. There are many broods of periodic cicadas that appear on rigid schedules depending on the year, but this is one of the largest and most noticeable. They will be in 15 states from Indiana to Georgia to New York; they are now coming out en masse in Tennessee and North Carolina.
When the whole brood emerges, the backyards can look like rippling waves and the chorus of insects is loud from the lawn mower.
Cicadas will come out most of the time at dusk to try to avoid anything that wants to eat them, squirming through holes in the ground. They will try to climb trees or anything vertical including Raupp and Shrewsbury. Once lifted off the ground, they shed their skin and attempt to survive this vulnerable stage before becoming the dinner party for a host of creatures, including ants, birds, dogs, cats, and Raupps.
It’s one of nature’s strangest events, featuring sex, a race against death, evolution, and what can sound like a bad sci-fi movie soundtrack.
Some people can be pushed back. Psychiatrists are calling entomologists worried about their patients, Shrewsbury said. But scientists say Brood X’s arrival is a sign that despite pollution, climate change and the dramatic loss of biodiversity, something is wrong with nature. And that’s quite a spectacle.
Raupp presents the story of the life of the cicada with all the verve of a Hollywood blockbuster:
“You have a creature that spends 17 years in a COVID-like existence, isolated underground sucking sap from plants, right? In the 17th year, these teens will come out of the earth by billions, if not billions. They’re going to try to do better than anything on the planet that wants to eat them during this critical time of the night when they’re just trying to grow up, they’re just trying to be adults, get rid of that skin, get their wings. , climb into the treetops, escape their predators, ”he says.
“Once you’re in the treetops, hey, it’s all about romance.” It is only the males who sing. It’s gonna be a big boy band up there as the men try to woo these women, try to convince that special someone that she should be the mother of his nymphs. He will play, sing songs. If she likes it, she’ll snap her wings. They’re going to have wild sex in the treetops.
“Then she will move to the small branches, lay their eggs. Then it will all be over in a few weeks. They will collapse. They will essentially fertilize the very plants from which they were spawned. Six weeks later, the tiny nymphs will fall 80 feet from the treetops, bounce twice, burrow into the ground, return underground for another 17 years.
“This,” says Raupp, “is one of the craziest life cycles of any creature on the planet.”
America is the only place in the world that has periodic cicadas that stay underground for 13 or 17 years, says entomologist John Cooley of the University of Connecticut.
Insects appear in large numbers only when the soil temperature reaches 64 degrees. This is happening earlier in the calendar in recent years because of climate change, explains entomologist Gene Kritsky. Before 1950, they appeared at the end of May; now they are coming out weeks earlier.
Although there have been a few early insects in Maryland and Ohio, soil temperatures have been in the low 60s. So Raupp and other scientists believe the big emergence is in days – a week. or two, max.
Cicadas that come out early do not survive. They are quickly eaten by predators. Cicadas have developed a key survival technique: overwhelming numbers. There are too many of them for all to eat when they all emerge at once, so some will survive and reproduce, Raupp says.
It is not an invasion. The cicadas are there all the time, quietly feeding on tree roots underground, not asleep, slowly moving around waiting for their body clocks to tell them it’s time to come out and breed. They have been in America for millions of years, much longer than people.
When they emerge, it gets loud – 105 loud decibels, like “a singles bar has gone horribly wrong,” Cooley says. There are three distinct species of cicadas and each has its own mating song.
They are not locusts and the only plants they damage are young trees, which can be harvested. The year after a big batch of cicadas, the trees fare better because the dead bugs serve as fertilizer, Kritsky says.
People tend to be afraid of bad bugs, says University of Illinois entomologist May Berenbaum. The mosquito kills more people than any other animal because of malaria and other diseases. Still, some people really dread the emergence of the cicada, she said.
“I think it’s the fact that they’re a downside. Plus, when they die en masse, they smell bad, ”says Berenbaum. “They really disrupt our sense of order.”
But others love cicadas – and even nibble on them, using recipes like those from a University of Maryland. recipe book. And for scientists like Cooley, there is real beauty in their life cycle.
“It’s a story of well-being, my friends. It really is and we need more of it in a year, ”he says. “When they come out, it’s a good sign that the forests are in good condition. Everything is as it is supposed to be.
Follow Seth Borenstein on Twitter: @borenbears
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