Depopulation of cockroaches in post-Soviet states

Since the beginning of the 21st century, the rapid disappearance of several types of cockroaches has been observed in Russia and other post-Soviet states. Various factors have been suggested as causes of their depopulation.

Background

A mass depopulation of cockroaches has been observed since the beginning of the 21st century in Russia and other countries of the former USSR. Observers^[who?] have noted a rapid disappearance of various types of cockroaches from cities and towns in Russia, Azerbaijan, Kazakhstan, Ukraine, Moldova, and Belarus.^[citation needed] However, no such depopulation has been observed in larger Russian megalopolises such as Moscow, Saint Petersburg, and Nizhny Novgorod.[1]

Scientists from Chelyabinsk and Yekaterinburg have suggested that the oriental cockroach should be added to the IUCN Red List of Threatened Species.[2][3]

Suggested explanations

The depopulation of cockroaches may be exaggerated, or this phenomenon may be temporary or cyclic.[1][4] A number of explanations of the phenomenon are discussed in the media, of varying degree of credibility.

• Usage of plastic bags to store domestic waste and the discontinuation of rubbish chute usage.[5]
• Cockroaches may have migrated out of homes to other, more suitable places.[6][7]
• Transitioning from antiquated roach-management methods such as egg yolk and boric acid to newer poisons and methods may have led to more effective depopulation.[8][9][10][1]
• Usage of modern construction materials may also contribute to the phenomenon; the population of cockroaches might have been reduced due to their purported ingestion of unsafe substances.[11][12][13] However, cockroaches were noticed to disappear even in the houses where such construction materials were not used.[14]
• The emergence of Pharaoh ants, who compete with the cockroaches for food, and may even feed on them. The ants will feed on dead cockroaches. [15]
• Ozone holes may also lead to abnormal chronobiology in cockroaches.[12][13]
• Internal competitions between cockroaches may decrease the number of cockroaches.[5]

See also

• Colony collapse disorder, bees

References

1. Исчезновение тараканов на Белгородчине не связано с радиацией :: ИА Бел.Ру - Новости Белгорода он-лайн (in Russian). Bel.ru. Archived from the original on 16 October 2013. Retrieved 23 August 2010.
2. "Российские экологи бьют тревогу: исчезающих из домов тараканов хотят переселить в Красную книгу". Newsru.com. 21 April 2008. Archived from the original on 7 September 2010. Retrieved 23 August 2010.
3. "Тараканы вымирают : Насекомых занесут в Красную книгу". Weekend.rbcdaily.ru. 18 April 2008. Archived from the original on 2 February 2010. Retrieved 23 August 2010.
4. Alexandr Goncearenco neksa neksa.net. "Архив за 02.06.2006 - "Независимая Молдова"". Nm.md. Archived from the original on 9 September 2010. Retrieved 23 August 2010.
5. "Газета Русский Курьер :: Тараканы в бегах". Ruscourier.ru. Archived from the original on 20 June 2010. Retrieved 23 August 2010.
6. "Тараканы бегут из Украины". Pk.kiev.ua. 7 November 2007. Archived from the original on 14 March 2008. Retrieved 23 August 2010.
7. "В Алматы снова вернулись тараканы". Zakon.kz. Archived from the original on 29 October 2021. Retrieved 26 July 2021.
8. "Факторы, вызвавшие исчезновение тараканов, могут привести к гибели человечества". Asfera.info. 28 January 2009. Archived from the original on 2 June 2010. Retrieved 23 August 2010.
9. "3 канал - Главная тема. Итоги". 3channel.ru. 21 April 2008. Archived from the original on 9 February 2009. Retrieved 23 August 2010.
10. "Тараканы в опасности". News.ntv.ru. Archived from the original on 2 August 2008. Retrieved 23 August 2010.
11. "Украинские ученые озабочены исчезновением тараканов » Наука и здоровье » Корреспондент". Korrespondent.net. 29 January 2009. Archived from the original on 2 June 2010. Retrieved 23 August 2010.
12. Большой город (in Russian). Bg.ru. Archived from the original on 3 March 2012. Retrieved 23 August 2010.
13. Задумайтесь: куда исчезли тараканы?. "Задумайтесь: куда исчезли тараканы?". Greenword.ru. Archived from the original on 19 August 2010. Retrieved 23 August 2010.
14. "Куда пропали тараканы?" Archived 2018-08-25 at the Wayback Machine, Komsomolskaya Pravda, February 14, 2007 (retrieved August 24, 2018)
15. Lee, Chow-Yang; Loke, Pooi-Yen (2004). "Foraging Behavior of Field Populations of the Big-Headed Ant, Pheidole megacephala (Hymenoptera: Formicidae)" (PDF). Sociobiology. 43 (2). Retrieved 15 October 2022. Results indicated throughout the study period that P. megacephala preferred the freshly-killed lobster cockroach (more than 40%)