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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 note quick disappearance of various types of cockroaches from cities and towns in Russia, Azerbaijan, Kazakhstan, Ukraine, Moldova, and Belarus. ==Possible explanations== The depopulation of cockroaches may be exaggerated, or this phenomenon may be temporary or cyclic. Theories advanced for possible factors in the decline in population include: * Usage of plastic bags to store domestic waste and the discontinuation of rubbish chutes usage. * Cockroaches may have migrated out of homes to other, more suitable places.〔( В Алмате вернулись тараканы )〕 * New, improved chemicals and methods to fight cockroaches may have led to migration, or direct depopulation. * 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. However, cockroaches were noticed to disappear even in the houses where such construction materials were not used. * The emergence of Pharaoh ants, who compete with the cockroaches for food, and may even feed on them. * The introduction of genetically modified food might have a negative influence on cockroaches. * Radioactive or chemical pollution (in Chernovtsy, Tambov, as well as due to Chernobyl disaster) may also be a factor,〔 although there is an opinion that cockroaches are insensitive to radiation.〔 * Widespread introduction of mobile phones and wireless networks might have a negative effect on the cockroaches.〔〔 * Ozone holes may also lead to abnormal biorhythms in cockroaches.〔〔 * Internal competitions between cockroaches may decrease the number of cockroaches.〔 It is also possible that a "perfect storm" with several of these factors may be the reason why the cockroach population has decreased. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Depopulation of cockroaches in post-Soviet states」の詳細全文を読む スポンサード リンク
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