
Angel Shark
Until fairly recently, scientists attempting to establish the existence, health, or migration of marine life had to use nets, cameras, or other means to identify and count the number of animals involved. Now researchers have a new and powerful tool, environmental DNA, or eDNA, a revolutionary technology that is helping scientists detect in real time the genetic information that animals leave in their wake.
Scientists have refined ways of extracting strands of genetic material from salt water, soil, and air. Depending on conditions, DNA can last for days in the ocean after an animal has shed it. Using small water samples collected at differing depths researchers can track where a specific species has swum, by checking DNA samples against reference databases.
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