Environmental DNA (eDNA) is an effective and affordable way to survey species and biodiversity. This report provides an introduction to eDNA: how it works, the science and why it is valuable.

eDNA: a powerful tool for conservation and biosecurity.

To make decisions about an environment, we need to know what lives there. Unfortunately, biological surveys can be difficult, time-consuming, expensive and invasive. Environmental DNA (eDNA) is a new tool that overcomes these problems. The eDNA in just a small sample of water, soil or scat can reveal which native species, pests and even diseases are found there. Here, we outline how eDNA works, the advantages of using eDNA, and the ways in which eDNA is revolutionising environmental management.