eDNA surveillance to characterize biotic diversity
DOI's USGS develops and tests environmental DNA (eDNA) tools for the detection of both invasive and native species in the nation’s waterways. Using eDNA for surveying or monitoring aquatic species can reduce costs and be less intrusive than methods that require direct capture of an organism. Throughout 2022 and 2023, efforts focused on the development and implementation of eDNA methods for native freshwater mussel species, including those that are federally listed. These activities are providing insight into best practices for eDNA survey design, including optimal sampling time for mussel eDNA and identification of factors affecting eDNA detection. USGS also assisted with a study of eDNA detection of the Missouri state-listed longnose darter that indicated possible expansion of the species’ range of distribution.