One of the key requirements for eDNA methods to be used routinely is that there are standardised methodologies for all steps in the process. This project was carried out in order to develop such a standardised approach for eDNA extracted from water samples.
Since eDNA analysis often deals with small quantities of short and degraded DNA fragments, methods that maximise eDNA recovery are required to increase detectability. This study conducted a range of rigorous experiments at different stages of the analysis of eDNA from water samples in order to determine which combinations of methods gave the best recovery rate for DNA. Using the Oriental weatherloach (Misgurnus anguillicaudatus) as a study species, we showed that various combinations of DNA capture, preservation and extraction methods can significantly affect DNA yield.
Specifically we showed that;
This information is useful in designing eDNA detection of low-density invasive or threatened species, where small variations in DNA recovery can signify the difference between detection success or failure.