Environmental DNA
Environmental DNA (eDNA) is genetic material shed by organisms into water, soil, or air, allowing scientists to detect species presence without seeing them directly.
Environmental DNA (eDNA) is genetic material shed by organisms into their surroundings, such as water, soil, or air, which can be collected and analyzed to assess biodiversity without direct observation. It originates from skin cells, mucus, feces, or gametes and is widely used in ecology and conservation to detect species presence, including rare or elusive ones, across diverse ecosystems.
What this means in real life
A wildlife manager tests water samples from a river to detect whether an endangered fish species still lives there, finding its DNA traces without needing to catch or see any fish.
What it isn’t
It is not the DNA of dead organisms buried in soil or fossils—it refers specifically to genetic material actively shed by living creatures into their immediate surroundings in detectable concentrations.
Commonly misused online
Often conflated with 'ancient DNA' or 'fossil DNA,' when in fact it describes contemporary genetic traces from living populations, not historical remains.