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Related article<\/span> \u2018As loud as a lawn mower\u2019: What to expect from the historic cicada emergence<\/span> <\/p>\n<\/p>\n<\/div>\n To figure out how cockroaches got there and spread to other parts of the world, first study author Dr. Qian Tang and his collaborators asked scientists and pest control experts around the globe for local specimens. The research team received 281 German cockroach samples from 57 sites in 17 countries and studied their DNA to trace their evolution. <\/p>\n
\u201cOur main purpose was to show how a species can travel with humans and how genetics can make up the missing part of historical records,\u201d said Tang, an evolutionary biologist who is now a postdoctoral research associate at Harvard University. <\/p>\n
Using genomic data from the samples, Tang was surprised to learn that the modern cockroach\u2019s lineage goes back much further than 18th century Europe. The insect evolved from the wild Asian cockroach, scientifically known as Blattella asahinai, 2,100 years ago, according to his research. <\/p>\n
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Related article<\/span> Extraordinary close-up images show insects as you\u2019ve never seen them before<\/span> <\/p>\n<\/p>\n<\/div>\n Cockroaches and trade routes<\/h3>\n
Around that time, Tang and his colleagues speculate, people in what is now India or Myanmar began planting crops in the Asian roach\u2019s natural habitat. The insects adapted \u2014 shifting their diets to include human food \u2014 and then shifted their territory into human households. <\/p>\n
A millennium later, as trade and military activity grew between southern Asia and the Middle East and later Europe, domesticated cockroaches spread westward, probably hitching rides in soldiers\u2019 and travelers\u2019 lunch baskets. The study team\u2019s genetic analysis puts the insects\u2019 first entry into Europe around 270 years ago. That estimate comes close to when famed Swedish geneticist Carl Linnaeus first described them in 1776, about a decade after the Seven Years\u2019 War raged across Asia, Europe and North America. The cockroaches then made it from Europe to the Americas about 120 years ago, the study found. <\/p>\n
\u201cInsects are part of the fabric of human culture,\u201d said Dr. Jessica Ware, curator of invertebrate zoology at the American Museum of Natural History in New York City, who was not involved in the research. \u201cFor the longest time, we\u2019ve kind of known that people are moving around a lot of pest species. And we know that transatlantic trade routes probably were the culprit for the spread of German cockroaches. But to actually see this reflected in the genetic signature of these populations, that was very exciting.\u201d <\/p>\n
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Related article<\/span> Moths actually aren\u2019t drawn to light as previously thought, study finds<\/span> <\/p>\n<\/p>\n<\/div>\n Humans have been making them at home ever since, she said. \u201cThe things that have allowed humans to thrive \u2014 indoor plumbing, indoor heating \u2014 are things that have also allowed cockroaches to thrive,\u201d Ware said. \u201cBy creating sewers underneath our cities, we couldn\u2019t have provided a better buffet.\u201d <\/p>\n
Next, Tang wants to sequence the full genomes of his hundreds of specimens to learn how German cockroaches have adapted so successfully to the human environment. \u201cFor example, the German cockroach has insecticide resistance that is not detected in many other pests,\u201d he said. \u201cHow can they evolve so fast? Is it something that\u2019s already in their genes, but has become revealed because of anthropogenic pressures?\u201d <\/p>\n
The insects also demonstrate social behaviors, communicating with one another about where to find food. Tang wants to find out if this ability, too, is a survival trait for which roaches have humans to thank. <\/p>\n
Amanda Schupak is a science and health journalist in New York City. <\/p>\n<\/p>\n
This post appeared first on cnn.com<\/div>\n
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The cockroach that emerged from your sink drain and scuttled under the fridge? The nocturnal critter was most likely a German cockroach, and its ancestors were pestering people more than 2,000 years ago in southern Asia, a new study found. The research, published May 20 in the journal Proceedings of the National Academy of Sciences, <\/p>\n","protected":false},"author":1,"featured_media":3792,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"class_list":{"0":"post-3791","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-world-news"},"_links":{"self":[{"href":"https:\/\/digitaltradecenter.com\/index.php\/wp-json\/wp\/v2\/posts\/3791","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/digitaltradecenter.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/digitaltradecenter.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/digitaltradecenter.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/digitaltradecenter.com\/index.php\/wp-json\/wp\/v2\/comments?post=3791"}],"version-history":[{"count":0,"href":"https:\/\/digitaltradecenter.com\/index.php\/wp-json\/wp\/v2\/posts\/3791\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/digitaltradecenter.com\/index.php\/wp-json\/wp\/v2\/media\/3792"}],"wp:attachment":[{"href":"https:\/\/digitaltradecenter.com\/index.php\/wp-json\/wp\/v2\/media?parent=3791"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/digitaltradecenter.com\/index.php\/wp-json\/wp\/v2\/categories?post=3791"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/digitaltradecenter.com\/index.php\/wp-json\/wp\/v2\/tags?post=3791"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}