Brood XIII
Brood XIII ( Brood 13 , Northern Illinois Brood ) is a population of the "Periodic Cicadas" ( Magicicada ) in the northeastern United States . Every 17th year, Brood XIII cicadas burrow en masse to the surface, lay eggs and die within a few weeks.
At the beginning of the 20th century, the entomologist Charles Lester Marlatt identified 30 different populations, of which around 15 could also be confirmed over the years. Brood XIII belongs to the 12 populations with a life cycle of 17 years.
The last appearance took place in spring and summer 2007. The insects were found in areas of northern Illinois , eastern Iowa , southern Wisconsin, and a narrow strip of Indiana on Lake Michigan and in Michigan . The next occurrences are expected in 2024 and 2041.
The 4 cm long (1.5 in) black insects cannot sting or bite. As soon as they reach the surface of the earth, they molt, leaving the empty larval skins on the ground. They climb trees and bushes, mate and die after about two weeks. Up to one million specimens per hectare (2.5 acres) can occur.
Ravinia
In 2007, in Highland Park , a suburb of Chicago , there were concerns that the cicadas would disrupt the Ravinia Festival in May and June. The Chicago Tribune reported that Ravinia adjusted the program so that the concerts of the Chicago Symphony Orchestra (CSO) would not be drowned out and other concerts were moved to halls.
gallery
Different phases of hatching
Brood XIII larva
Freshly hatched cicada
Brood XIII in Westchester, Ill., June 21, 2007
Web links
Individual evidence
- ^ Susan L. Post: A Trill of a Lifetime. University of Illinois 2004 ( inhs.uiuc.edu ( Memento of May 10, 2007 in the Internet Archive )).
- Jump up ↑ David Marshall & John Cooley: Brood XIII (17-year) . In: Periodical Cicada Page . University of Michigan . March 20, 2006. Archived from the original on March 15, 2007.
- ^ Thomas E. Moore: Genus Magicidada : periodical cicadas . In: Singing Insects of North America . University of Florida . Archived from the original on December 10, 2008. Retrieved October 26, 2011.
- ^ Topic Galleries . chicagotribune.com. Accessed on June 28, 2011. ( Page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
