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The entire state of Illinois is going to be crawling with cicadas

March 31, 2024
in Technology
The entire state of Illinois is going to be crawling with cicadas
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BUZZ BUZZ BUZZ BUZZ BUZZ —

And the land shall feast on their dead.

Celia Ford, wired.com
– Mar 30, 2024 10:30 am UTC

Adult periodical cicada

Ed Reschke via Getty

Brace yourselves, Illinoisans: A truly shocking number of cicadas are about to live, make sweet love, and die in a tree near you. Two broods of periodical cicadas—Brood XIX on a 13-year cycle and Brood XIII on a 17-year cycle—are slated to emerge together in central Illinois this summer for the first time in over two centuries. To most humans, they’re an ephemeral spectacle and an ear-splitting nuisance, and then they’re gone. To many other Midwestern animals, plants, and microbes, they’re a rare feast, bringing new life to forests long past their death.

From Nebraska to New York, 15 broods of periodical cicadas grow underground, quietly sipping watery sap from tree roots. After 13 or 17 years (depending on the brood), countless inch-long adults dig themselves out in sync, crawling out of the ground en masse for a monthlong summer orgy. After mating, they lay eggs in forest trees and die, leaving their tree-born babies to fall to the forest floor and begin the cycle anew. Cicadas don’t fly far from their birthplace, so each brood occupies a distinct patch of the US. “They form a mosaic on the landscape,” says Chris Simon, senior research scientist in ecology and evolutionary biology at the University of Connecticut.

Most years, at least one of these 15 broods emerges (annual cicadas, not to be confused with their smaller periodical cousins, pop up separately every summer). Sometimes two broods emerge at the same time. It’s also not unheard of for multiple broods to coexist in the same place. “What’s unusual is that these two broods are adjacent,” says John Lill, insect ecologist at George Washington University. “Illinois is going to be ground zero. From the very top to the very bottom of the state, it’s going to be covered in cicadas.” The last time that these broods swarmed aboveground together, Thomas Jefferson was president and the city of Chicago had yet to exist.

Entomologists around the world already have their flights booked for May. “We’re like cicada groupies,” Lill says. He promises that this once-in-a-generation spectacle will be even better than April’s total solar eclipse. During 2004’s Brood X emergence, Lill remembers walking outside at midnight. “For two seconds, I was like, ‘Wow, I didn’t know it was raining,’ because I saw water flowing down the street. As my eyes focused, I realized it was literally just thousands of cicadas crawling across the street.”

Some cicada devotees, like author and entomologist Greg Kritsky, have already witnessed Brood XIII emerge a couple of times. But for most of their predators, a brood emergence happens once in a lifetime, and it’s always an extremely pleasant surprise. “It’s a food bonanza,” Kritsky says, “like if you walked outside and found the whole world swarming with flying Hershey’s Kisses.”

Cicadas are shockingly chill, protein-packed, and taste like high-end shrimp—easy, delicious prey. “Periodical cicadas are sitting ducks,” says Lill. They don’t bite, sting, or poison anyone, and they’re totally unbothered by being handled. Dogs, raccoons, birds, and other generalist predators will gorge themselves on this flying feast until they’re stuffed, and it barely makes a dent in the cicada population. It’s their secret weapon, Lill says: In the absence of other defense mechanisms, “they just overwhelm predators by their sheer abundance.”

Much like an unexpected free dinner will distract you from the leftovers sitting in your fridge, this summer’s cicada emergence will turn predators away from their usual prey. During the 2021 Brood X emergence, Zoe Getman-Pickering, a scientist in Lill’s research group, found that as birds swooped in on cicadas, caterpillar populations exploded. Spared from birds, caterpillars chomped on twice as many oak leaves as normal—and the chain of effects went on and on. Scientists can’t possibly study them all. “The ecosystem gets a swift kick, with this unexpected perturbation that changes a lot of things at once,” says Louie Yang, an ecologist and professor of entomology at UC Davis.

From birth to death, these insects shape the forest around them. As temperatures rise in late April, pale, red-eyed cicada nymphs begin clawing pinky-sized holes in the ground, preparing for their grand May entrance. All of these tunnels make it easier for rainwater to move through the soil, where it can then be used by plants and other dirt-inhabiting microbes. Once fully grown and aboveground, adult cicadas shed their exoskeletons, unfurl their wings, and fly off to spend their remaining four to six weeks on Earth singing (if they’re male), listening for the sexiest songs (if they’re female), and mating.

Mother cicadas use the metal-enhanced saws built into their abdomens—wood-drilling shafts layered with elements like aluminum, copper, and iron—to slice pockets into tree branches, where they’ll lay roughly 500 eggs each. Sometimes, all of these cuts cause twigs to wither or snap, killing leaves. While this could permanently damage a very young sapling, mature trees simply shed the slashed branches and carry on. “It’s like natural pruning,” Kritsky says, which keeps hearty trees strong, prevents disease, and promotes flower growth.

Once mating season winds down, so does the cicada’s life. “In late summer, everybody forgets about cicadas,” Lill says. “They all die. They all rot in the ground. And then they’re gone.” By late June, there will be millions of pounds of cicadas piling up at the base of trees, decomposing. The smell, Kritsky says, “is a sentient memory you will never forget—like rancid Limburger cheese.”

But these stinky carcasses send a massive pulse of food to scavengers in the soil. “The cicadas serve as reservoirs of nutrients,” Yang says. “When they come out, they release all this stored energy into the ecosystem,” giving their bodies back to the plants that raised them. In the short term, dead cicadas have a fertilizing effect, feeding microbes in the soil and helping plants grow larger. And as their remnants make their way into woodland ponds and streams, cicada nutrients are carried downstream, where they may strengthen aquatic ecosystems far beyond their home tree.

They may smell like bad hamburgers, but Yang says that if you’re lucky enough to host a tree full of cicadas this year, it’s best to just leave their bodies alone to decompose naturally. “They’ll be gone soon enough,” he says. If the pileup is especially obtrusive, simply sweep them out of the way and let nature do the rest.

The thought of billions of screeching insects in your backyard might make your skin crawl, but you don’t need to be a passive observer when they arrive. Researchers are clamoring for citizen scientists to send in photos of their local cicadas to help map the upcoming emergence. The Cicada Safari app, developed by Kritsky, received and verified 561,000 cicada pics during the 2021 Brood X emergence—he hopes to get even more this time around.

“This is an amazing natural phenomenon to wonder about,” Lill says, “not something to be afraid of.”

This story originally appeared on wired.com.

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : Ars Technica – https://arstechnica.com/?p=2013710

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