Here are the most surprising places scientists have found hidden DNA—from beaches to beetles’ bellies—and what these discoveries are teaching us
By filtering air
The twin discoveries made for a watershed moment in eDNA history, but what they missed was almost as fascinating as what they caught. Some species were never detected, and an animal’s body size and the number of individuals didn’t always seem to have a bearing on how strong the reads were. Now, both teams are working to refine their techniques. Clare and colleagues have deployed four rounds of prototypes in naturalistic settings from Ontario to the tropics, she says, and are experimenting with passive collection of eDNA from dust.
“One of the early concerns [was] that there would be no real signal—the ‘everything is everywhere’ risk,” she explains. “It has been suggested that wind would just move the DNA all around making it a homogeneous soup. Our data suggest the opposite.”Population dynamics for the whale shark, an enigmatic giant that prefers the deep water in the open ocean and doesn’t need to surface for air, remain something of a mystery to scientists.
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