Tuesday, December 10, 2013

When Crime Scene Evidence Crawls Away

From WIRED Magazine

Regular watchers of CSI and other forensic shows might be surprised to learn that forensic entomology is actually a branch of applied ecology. Decomposition is a critical ecosystem service that humans get for free and often take for granted.

Necrophagous animals are critical to the Earth’s healthy functioning. Because of necrophages’ hard work, we aren’t clambering over dead dinosaurs and spelunking past deceased relatives in a world covered with layer after layer of corpses.  A carcass is an empty bit of habitat waiting to be colonized.

Adult blowflies have an astonishing sense of smell for putrescine and cadaverine, molecules¹ that signal a delicious bucket-kicking has occurred. A dead body is conveniently pre-packaged baby food for fly eggs. Flies arrive in large numbers within minutes after someone begins their dirt nap. It’s rather like when a pizza delivery is made to a dorm; undergraduates magically appear out of thin air, summoned by the yummy aroma.

Read more here.

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