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A infografia mostra as áreas onde se espera que as cigarras venham a emergia e o seu ciclo de vida.
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AMBIENTE

EUA esperam a chegada de biliões de cigarras

By Jordi Bou

April 29, 2021 - Vão emergir biliões de cigarras que passaram 17 anos no subsolo, em amplas partes do leste dos Estados Unidos, levando o seu canto de acasalamento de elevado volume às cidades e vilas.

Also known as the “great eastern brood”, they were last seen in 2004 and will emerge across 15 states in the U.S., from Georgia in the south to New York in the north.

This year's group, known as Brood X, is the largest and most broadly distributed of all 15 broods of periodical cicadas in the U.S.

There are 15 different periodical broods of cicadas and two appear to have become extinct. As opposed to annual broods, which emerge every year from July to September, periodical broods stay underground for either 13 or 17 years, depending on the brood.

Cicadas do not bite but emit sounds between 80 and 100 decibels, the equivalent to a low flying airplane or a lawn mower.

Scientists believe that huge and synchronised arrival provides protection against predators.

Sources
PUBLISHED: 01/05/2021; STORY: Graphic News; PICTURES: Getty Images
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