birdwatcher (![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png)
birdwatcher) wrote2007-04-10 10:03 am
birdwatcher) wrote2007-04-10 10:03 am
Magicicada, Brood XIII
В этом году в Чикаго вылезут периодические цикады!!! Это бывает раз в 17 лет.
The northern Illinois brood, which will emerge in late May 2007, has a reputation for the largest emergence of cicadas known anywhere. This is due to the size of the emergence and the research and subsequent reporting over the years by entomologists Monte Lloyd and Henry Dybas at the Field Museum in Chicago. During the 1956 emergence, they counted an average of 311 nymphal emergence holes per square yard of ground in a forested floodplain near Chicago. This translates to 1½ million cicadas per acre.
Прошлый раз аналогичный случай произошел в 1990 году: there were reports from people in Chicago having to use snow shovels to clear their sidewalks of the dead cicadas.
The northern Illinois brood, which will emerge in late May 2007, has a reputation for the largest emergence of cicadas known anywhere. This is due to the size of the emergence and the research and subsequent reporting over the years by entomologists Monte Lloyd and Henry Dybas at the Field Museum in Chicago. During the 1956 emergence, they counted an average of 311 nymphal emergence holes per square yard of ground in a forested floodplain near Chicago. This translates to 1½ million cicadas per acre.
Прошлый раз аналогичный случай произошел в 1990 году: there were reports from people in Chicago having to use snow shovels to clear their sidewalks of the dead cicadas.
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