Reporting the limits of detection and quantification for environmental DNA assays

Environmental DNA
By: , and 

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Abstract

Background

Environmental DNA (eDNA) analysis is increasingly being used to detect the presence and relative abundance of rare species, especially invasive or imperiled aquatic species. The rapid progress in the eDNA field has resulted in numerous studies impacting conservation and management actions. However, standardization of eDNA methods and reporting across the field is yet to be fully established, with one area being the calculation and interpretation of assay limit of detection (LOD) and limit of quantification (LOQ).

Aims

Here, we propose establishing consistent methods for determining and reporting of LOD and LOQ for single‐species quantitative PCR (qPCR) eDNA studies.

Materials & Methods/ Results

We utilize datasets from multiple cooperating laboratories to demonstrate both a discrete threshold approach and a curve‐fitting modeling approach for determining LODs and LOQs for eDNA qPCR assays. We also provide details of an R script developed and applied for the modeling method.

Discussion/Conclusions

Ultimately, standardization of how LOD and LOQ are determined, interpreted, and reported for eDNA assays will allow for more informed interpretation of assay results, more meaningful interlaboratory comparisons of experiments, and enhanced capacity for assessing the relative technical quality and performance of different eDNA qPCR assays.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Reporting the limits of detection and quantification for environmental DNA assays
Series title Environmental DNA
DOI 10.1002/edn3.29
Edition Online First
Year Published 2019
Language English
Publisher Wiley
Contributing office(s) Wetland and Aquatic Research Center, Upper Midwest Environmental Sciences Center, Columbia Environmental Research Center